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  • Inorganic Chemistry  (1,495)
  • Aircraft Propulsion and Power
  • Life and Medical Sciences
  • 2015-2019  (42)
  • 1965-1969  (1,042)
  • 1955-1959  (803)
  • 1950-1954
  • 2016  (42)
  • 1966  (1,042)
  • 1959  (803)
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  • 2015-2019  (42)
  • 1965-1969  (1,042)
  • 1955-1959  (803)
  • 1950-1954
Year
  • 1
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    [Editors' Choice] A pair of tablemates for aromatic benzene (2016)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publication Date: 2016-09-09
    Description: Author: Jake Yeston
    Keywords: Inorganic Chemistry
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
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    [This Week in Science] Coordinated scission of N–H or O–H bonds (2016)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publication Date: 2016-11-11
    Description: Author: Jake Yeston
    Keywords: Inorganic Chemistry
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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    PAPER CURRENT
  • 3
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    Re: Penetration Behavior of Opposed Rows of Staggered Secondary Air Jets Depending on Jet Penetration Coefficient and Momentum Flux Ratio (2016)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The purpose of this article is to explain why the extension of the previously published C = (S/Ho)sqrt(J) scaling for opposed rows of staggered jets wasn't directly successful in the study by Choi et al. (2016). It is not surprising that staggered jets from opposite sides do not pass each other at the expected C value, because Ho/D and sqrt(J) are much larger than the maximum in previous studies. These, and large x/D's, tend to suggest development of 2-dimensional flow. Although there are distinct optima for opposed rows of in-line jets, single-side injection, and opposed rows of staggered jets based on C, opposed rows of staggered jets provide as good or better mixing performance, at any C value, than opposed rows of in-line jets or jets from single-side injection.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN33874 , International Journal of Heat and Mass Transfer (e-ISSN 0017-9310); 102; 435-444
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    NASA TECHNICAL REPORTS
  • 4
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    A Requirements-Driven Optimization Method for Acoustic Treatment Design (2016)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Acoustic treatment designers have long been able to target specific noise sources inside turbofan engines. Facesheet porosity and cavity depth are key design variables of perforate-over-honeycomb liners that determine levels of noise suppression as well as the frequencies at which suppression occurs. Layers of these structures can be combined to create a robust attenuation spectrum that covers a wide range of frequencies. Looking to the future, rapidly-emerging additive manufacturing technologies are enabling new liners with multiple degrees of freedom, and new adaptive liners with variable impedance are showing promise. More than ever, there is greater flexibility and freedom in liner design. Subject to practical considerations, liner design variables may be manipulated to achieve a target attenuation spectrum. But characteristics of the ideal attenuation spectrum can be difficult to know. Many multidisciplinary system effects govern how engine noise sources contribute to community noise. Given a hardwall fan noise source to be suppressed, and using an analytical certification noise model to compute a community noise measure of merit, the optimal attenuation spectrum can be derived using multidisciplinary systems analysis methods. The subject of this paper is an analytical method that derives the ideal target attenuation spectrum that minimizes noise perceived by observers on the ground.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN31751 , AIAA/CEAS Aeroacoustics Conference; May 30, 2016 - Jun 01, 2016; Lyon; France
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  • 5
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    Impact of an Exhaust Throat on Semi-Idealized Rotating Detonation Engine Performance (2016)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A computational fluid dynamic (CFD) model of a rotating detonation engine (RDE) is used to examine the impact of an exhaust throat (i.e. a constriction) on performance. The model simulates an RDE which is premixed, adiabatic, inviscid, and which contains an inlet valve that prevents backflow from the high pressure region directly behind the rotating detonation. Performance is assessed in terms of ideal net specific impulse which is computed on the assumption of lossless expansion of the working fluid to the ambient pressure through a notional diverging nozzle section downstream of the throat. Such a semi-idealized analysis, while not real-world, allows the effect of the throat to be examined in isolation from, rather than coupled to (as it actually is) various loss mechanisms. For the single Mach 1.4 flight condition considered, it is found that the addition of a throat can yield a 9.4 percent increase in specific impulse. However, it is also found that when the exit throat restriction gets too small, an unstable type of operation ensues which eventually leads to the detonation failing. This behavior is found to be somewhat mitigated by the addition of an RDE inlet restriction across which there is an aerodynamic loss. Remarkably, this loss is overcome by the benefits of the further exhaust restrictions allowed. The end result is a configuration with a 10.3 percent improvement in ideal net specific thrust.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN28815 , AIAA Aerospace Sciences Meeting (SciTech 2016); Jan 04, 2016 - Jan 08, 2016; San Diego, CA; United States
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  • 6
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    Turboelectric Aircraft Drive Key Performance Parameters and Functional Requirements (2016)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The purpose of this paper is to propose specific power and efficiency as the key performance parameters for a turboelectric aircraft power system and investigate their impact on the overall aircraft. Key functional requirements are identified that impact the power system design. Breguet range equations for a base aircraft and a turboelectric aircraft are found. The benefits and costs that may result from the turboelectric system are enumerated. A break-even analysis is conducted to find the minimum allowable electric drive specific power and efficiency that can preserve the range, initial weight, operating empty weight, and payload weight of the base aircraft.
    Keywords: Aircraft Propulsion and Power
    Type: NASA/TM-2016-218919 , AIAA Paper 2015-3890 , E-19104-1 , GRC-E-DAA-TN26012 , AIAA Propulsion and Energy Forum 2015; Jul 27, 2015 - Jul 29, 2015; Orlando, FL; United States
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  • 7
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    Vehicle Integrated Propulsion Research (VIPR) III Volcanic Ash Environment (VAE) Preliminary Visual and Teardown Observations (2016)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: This presentation will be used to develop a level of partnership that is not within the current NASA program for N+3 engine operations.
    Keywords: Aircraft Propulsion and Power
    Type: DFRC-E-DAA-TN30644 , Aircraft Airworthiness and Sustainment Conference (AA&S 2016); Mar 21, 2016 - Mar 24, 2016; Grapevine, TX; United States
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  • 8
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    Sensor Selection for Aircraft Engine Performance Estimation and Gas Path Fault Diagnostics (2016)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: This paper presents analytical techniques for aiding system designers in making aircraft engine health management sensor selection decisions. The presented techniques, which are based on linear estimation and probability theory, are tailored for gas turbine engine performance estimation and gas path fault diagnostics applications. They enable quantification of the performance estimation and diagnostic accuracy offered by different candidate sensor suites. For performance estimation, sensor selection metrics are presented for two types of estimators including a Kalman filter and a maximum a posteriori estimator. For each type of performance estimator, sensor selection is based on minimizing the theoretical sum of squared estimation errors in health parameters representing performance deterioration in the major rotating modules of the engine. For gas path fault diagnostics, the sensor selection metric is set up to maximize correct classification rate for a diagnostic strategy that performs fault classification by identifying the fault type that most closely matches the observed measurement signature in a weighted least squares sense. Results from the application of the sensor selection metrics to a linear engine model are presented and discussed. Given a baseline sensor suite and a candidate list of optional sensors, an exhaustive search is performed to determine the optimal sensor suites for performance estimation and fault diagnostics. For any given sensor suite, Monte Carlo simulation results are found to exhibit good agreement with theoretical predictions of estimation and diagnostic accuracies.
    Keywords: Aircraft Propulsion and Power
    Type: NASA/TM-2016-218926 , GT2015-43744 , E-19182 , GRC-E-DAA-TN27315 , ASME Turbo Expo 2015; Jun 15, 2015 - Jun 19, 2015; Montreal, Quebec; Canada
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  • 9
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    Efficient, Low Pressure Ratio Propulsor for Gas Turbine Engines (2016)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: A gas turbine engine includes a spool, a turbine coupled to drive the spool, and a propulsor that is coupled to be driven by the turbine through the spool. A gear assembly is coupled between the propulsor and the spool such that rotation of the turbine drives the propulsor at a different speed than the spool. The propulsor includes a hub and a row of propulsor blades that extends from the hub. The row includes no more than 20 of the propulsor blades.
    Keywords: Aircraft Propulsion and Power
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  • 10
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    Practical Techniques for Modeling Gas Turbine Engine Performance (2016)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: The cost and risk associated with the design and operation of gas turbine engine systems has led to an increasing dependence on mathematical models. In this paper, the fundamentals of engine simulation will be reviewed, an example performance analysis will be performed, and relationships useful for engine control system development will be highlighted. The focus will be on thermodynamic modeling utilizing techniques common in industry, such as: the Brayton cycle, component performance maps, map scaling, and design point criteria generation. In general, these topics will be viewed from the standpoint of an example turbojet engine model; however, demonstrated concepts may be adapted to other gas turbine systems, such as gas generators, marine engines, or high bypass aircraft engines. The purpose of this paper is to provide an example of gas turbine model generation and system performance analysis for educational uses, such as curriculum creation or student reference.
    Keywords: Aircraft Propulsion and Power
    Type: NASA/TM-2016-219147 , E-19270 , GRC-E-DAA-TN34474
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  • 11
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    Full-Scale Turbofan Engine Noise-Source Separation Using a Four-Signal Method (2016)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: Contributions from the combustor to the overall propulsion noise of civilian transport aircraft are starting to become important due to turbofan design trends and expected advances in mitigation of other noise sources. During on-ground, static-engine acoustic tests, combustor noise is generally sub-dominant to other engine noise sources because of the absence of in-flight effects. Consequently, noise-source separation techniques are needed to extract combustor-noise information from the total noise signature in order to further progress. A novel four-signal source-separation method is applied to data from a static, full-scale engine test and compared to previous methods. The new method is, in a sense, a combination of two- and three-signal techniques and represents an attempt to alleviate some of the weaknesses of each of those approaches. This work is supported by the NASA Advanced Air Vehicles Program, Advanced Air Transport Technology Project, Aircraft Noise Reduction Subproject and the NASA Glenn Faculty Fellowship Program.
    Keywords: Aircraft Propulsion and Power
    Type: NASA/TM-2016-219419 , E-19316 , GRC-E-DAA-TN36520
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  • 12
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    Dynamic Systems Analysis for Turbine Based Aero Propulsion Systems (2016)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: The aircraft engine design process seeks to optimize the overall system-level performance, weight, and cost for a given concept. Steady-state simulations and data are used to identify trade-offs that should be balanced to optimize the system in a process known as systems analysis. These systems analysis simulations and data may not adequately capture the true performance trade-offs that exist during transient operation. Dynamic systems analysis provides the capability for assessing the dynamic tradeoffs at an earlier stage of the engine design process. The dynamic systems analysis concept, developed tools, and potential benefit are presented in this paper. To provide this capability, the Tool for Turbine Engine Closed-loop Transient Analysis (TTECTrA) was developed to provide the user with an estimate of the closed-loop performance (response time) and operability (high pressure compressor surge margin) for a given engine design and set of control design requirements. TTECTrA along with engine deterioration information, can be used to develop a more generic relationship between performance and operability that can impact the engine design constraints and potentially lead to a more efficient engine.
    Keywords: Aircraft Propulsion and Power
    Type: NASA/TM-2016-219133 , E-19258 , GRC-E-DAA-TN31154
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  • 13
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    Investigation of Spiral and Sweeping Holes (2016)
    In:  CASI
    Details
    Publication Date: 2019-07-18
    Description: Surface infrared thermography, hotwire anemometry, and thermocouple surveys were performed on two new film cooling hole geometries: spiral/rifled holes and fluidic sweeping holes. The spiral holes attempt to induce large-scale vorticity to the film cooling jet as it exits the hole to prevent the formation of the kidney shaped vortices commonly associated with film cooling jets. The fluidic sweeping hole uses a passive in-hole geometry to induce jet sweeping at frequencies that scale with blowing ratios. The spiral hole performance is compared to that of round holes with and without compound angles. The fluidic hole is of the diffusion class of holes and is therefore compared to a 777 hole and Square holes. A patent-pending spiral hole design showed the highest potential of the non-diffusion type hole configurations. Velocity contours and flow temperature were acquired at discreet cross-sections of the downstream flow field. The passive fluidic sweeping hole shows the most uniform cooling distribution but suffers from low span-averaged effectiveness levels due to enhanced mixing. The data was taken at a Reynolds number of 11,000 based on hole diameter and freestream velocity. Infrared thermography was taken for blowing ratios of 1.0, 1.5, 2.0, and 2.5 at a density ratio of 1.05. The flow inside the fluidic sweeping hole was studied using 3D unsteady RANS.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN35549 , Journal of Turbomachinery (ISSN 0889-504X) (e-ISSN 1528-8900); 138; 9
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  • 14
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    Sub-scale Waterflow Cavitation and Dynamic Transfer Function Testing of an Oxidizer Turbo-Pump Combined Inducer and Impeller (2016)
    In:  CASI
    Details
    Publication Date: 2019-08-13
    Description: In 2009 and 2010, Concepts NREC prepared for and performed a series of tests on a 52% scale of a version of the Pratt & Whitney Rocketdyne J-2X Oxidizer Turbopump under a Phase III SBIR with NASA MSFC. The test article was a combined inducer and impeller, tested as a unit. This paper presents an overview of the test rig and facility, instrumentation, signal conditioning, data acquisition systems, testing approach, measurement developments, and lessons learned. Results from these tests were presented in the form of two papers at the previous JANNAF joint propulsion conference, in December of 2011.
    Keywords: Aircraft Propulsion and Power
    Type: M16-5435 , Liquid Propulsion; Dec 05, 2016 - Dec 08, 2016; Phoenix, AZ; United States|Modeling and Simulation; Dec 05, 2016 - Dec 08, 2016; Phoenix, AZ; United States|JANNAF Joint Meeting; Dec 05, 2016 - Dec 08, 2016; Phoenix, AZ; United States|Spacecraft Propulsion; Dec 05, 2016 - Dec 08, 2016; Phoenix, AZ; United States
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  • 15
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    High-Lift Propeller System Configuration Selection for NASA's SCEPTOR Distributed Electric Propulsion Flight Demonstrator (2016)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Although the primary function of propellers is typically to produce thrust, aircraft equipped with distributed electric propulsion (DEP) may utilize propellers whose main purpose is to act as a form of high-lift device. These \high-lift propellers" can be placed upstream of wing such that, when the higher-velocity ow in the propellers' slipstreams interacts with the wing, the lift is increased. This technique is a main design feature of a new NASA advanced design project called Scalable Convergent Electric Propulsion Technology Operations Research (SCEPTOR). The goal of the SCEPTOR project is design, build, and y a DEP aircraft to demonstrate that such an aircraft can be much more ecient than conventional designs. This paper provides details into the high-lift propeller system con guration selection for the SCEPTOR ight demonstrator. The methods used in the high-lift propeller system conceptual design and the tradeo s considered in selecting the number of propellers are discussed.
    Keywords: Aircraft Propulsion and Power
    Type: NF1676L-22853 , AIAA Aviation 2016; Jun 13, 2016 - Jun 17, 2016; Washington, DC; United States
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    NASA TECHNICAL REPORTS
  • 16
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    Model-Based Engine Control Architecture with an Extended Kalman Filter (2016)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: This paper discusses the design and implementation of an extended Kalman filter (EKF) for model-based engine control (MBEC). Previously proposed MBEC architectures feature an optimal tuner Kalman Filter (OTKF) to produce estimates of both unmeasured engine parameters and estimates for the health of the engine. The success of this approach relies on the accuracy of the linear model and the ability of the optimal tuner to update its tuner estimates based on only a few sensors. Advances in computer processing are making it possible to replace the piece-wise linear model, developed off-line, with an on-board nonlinear model running in real-time. This will reduce the estimation errors associated with the linearization process, and is typically referred to as an extended Kalman filter. The non-linear extended Kalman filter approach is applied to the Commercial Modular Aero-Propulsion System Simulation 40,000 (C-MAPSS40k) and compared to the previously proposed MBEC architecture. The results show that the EKF reduces the estimation error, especially during transient operation.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN28335 , AIAA SciTech 2016; Jan 04, 2016 - Jan 08, 2016; San Diego, CA; United States
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  • 17
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    Emission Characteristics of A P and W Axially Staged Sector Combustor (2016)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Emission characteristics of a three-cup P and W Axially Controlled Stoichiometry (ACS) sector combustor are reported in this article. Multiple injection points and fuel staging strategies are used in this combustor design. Pilot-stage injectors are located on the front dome plate of the combustor, and main-stage injectors are positioned on the top and bottom of the combustor liners downstream. Low power configuration uses only pilot-stage injectors. Main-stage injectors are added to high power configuration to help distribute fuel more evenly and achieve overall lean burn yielding very low NOx emissions. Combustion efficiencies at four ICAO LTO conditions were all above 99%. Three EINOx emissions correlation equations were developed based on the experimental data to describe the NOx emission trends of this combustor concept. For the 7% and 30% engine power conditions, NOx emissions are obtained with the low power configuration, and the EINOx values are 6.16 and 6.81. The high power configuration was used to assess 85% and 100% engine power NOx emissions, with measured EINOx values of 4.58 and 7.45, respectively. The overall landing-takeoff cycle NOx emissions are about 12% relative to ICAO CAEP/6 level.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN28388 , AIAA SciTech 2016; Jan 04, 2016 - Jan 08, 2016; San Diego, CA; United States
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  • 18
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    Virtual Flight Demonstration of the Stratospheric Dual-Aircraft Platform (2016)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A baseline configuration for the dual-aircraft platform (DAP) concept is described and evaluated in a physics-based flight dynamics simulations for two month-long missions as a communications relay in the lower stratosphere above central Florida. The DAP features two unmanned aerial vehicles connected via a long adjustable cable which effectively sail back-and-forth using wind velocity gradients and solar energy. Detailed atmospheric profiles in the vicinity of 60,000-ft derived from archived data measured by the 50-Mhz Doppler Radar Wind Profiler at Cape Canaveral are used in the flight simulations. An overview of the novel guidance and flight control strategies are provided. The energy-usage of the baseline configuration during month-long stationkeeping missions (i.e., within 150-mile radius of downtown Orlando) is characterized and compared to that of a pure solar aircraft.
    Keywords: Aircraft Propulsion and Power
    Type: M16-5303 , AIAA Aviation 2016; Jun 13, 2016 - Jun 17, 2016; Washington, DC; United States
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    NASA TECHNICAL REPORTS
  • 19
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    Propulsion System Dynamic Modeling of the NASA Supersonic Concept Vehicle for AeroPropulsoServoElasticity (2016)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A summary of the propulsion system modeling under NASA's High Speed Project (HSP) AeroPropulsoServoElasticity (APSE) task is provided with a focus on the propulsion system for the low-boom supersonic configuration developed by Lockheed Martin and referred to as the N+2 configuration. This summary includes details on the effort to date to develop computational models for the various propulsion system components. The objective of this paper is to summarize the model development effort in this task, while providing more detail in the modeling areas that have not been previously published. The purpose of the propulsion system modeling and the overall APSE effort is to develop an integrated dynamic vehicle model to conduct appropriate unsteady analysis of supersonic vehicle performance. This integrated APSE system model concept includes the propulsion system model, and the vehicle structural aerodynamics model. The development to date of such a preliminary integrated model will also be summarized in this report
    Keywords: Aircraft Propulsion and Power
    Type: NASA/TM-2016-218937 , AIAA Paper 2014-3684 , E-19185 , GRC-E-DAA-TN26748 , Joint Propulsion Conference; Jul 28, 2014 - Jul 30, 2014; Cleveland, OH; United States
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  • 20
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    Model-Based Engine Control Architecture with an Extended Kalman Filter (2016)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: This paper discusses the design and implementation of an extended Kalman filter (EKF) for model-based engine control (MBEC). Previously proposed MBEC architectures feature an optimal tuner Kalman Filter (OTKF) to produce estimates of both unmeasured engine parameters and estimates for the health of the engine. The success of this approach relies on the accuracy of the linear model and the ability of the optimal tuner to update its tuner estimates based on only a few sensors. Advances in computer processing are making it possible to replace the piece-wise linear model, developed off-line, with an on-board nonlinear model running in real-time. This will reduce the estimation errors associated with the linearization process, and is typically referred to as an extended Kalman filter. The nonlinear extended Kalman filter approach is applied to the Commercial Modular Aero-Propulsion System Simulation 40,000 (C-MAPSS40k) and compared to the previously proposed MBEC architecture. The results show that the EKF reduces the estimation error, especially during transient operation.
    Keywords: Aircraft Propulsion and Power
    Type: NASA/TM-2016-219066 , E-19199 , GRC-E-DAA-TN29222 , AIAA SciTech 2016; Jan 04, 2016 - Jan 08, 2016; San Diego, CA; United States
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  • 21
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    Building Blocks for Transport-Class Hybrid and Turboelectric Vehicles (2016)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: NASA has been investing in research efforts to define potential vehicles that use hybrid and turboelectric propulsion to enable savings in fuel burn and carbon usage. This paper overviews the fundamental building blocks that have been derived from those studies and details what key performance parameters have been defined, what key ground and flight tests need to occur, and highlights progress toward each.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN35894 , Electric & Hybrid Aerospace Technology Symposium 2016; Nov 09, 2016 - Nov 10, 2016; Cologne; Germany
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  • 22
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    Alternative Bio-Derived JP-8 Class Fuel and JP-8 Fuel: Flame Tube Combustor Test Results Compared using a GE TAPS Injector Configuration (2016)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: This paper presents results from tests in a NASA Glenn Research Center (GRC) flame tube facility, where a bio-derived alternate fuel was compared with JP-8 for emissions and general combustion performance. A research version of General Electric Aviation (GE) TAPS injector was used for the tests. Results include 2D, planar laser-based imaging as well as basic flow visualization of the flame. Four conditions were selected that simulate various engine power conditions relevant to NASA Fundamental Aeronautics Supersonics and Environmentally Responsible Aviation Projects were tested.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN34170 , AIAA/SAE/ASEE Joint Propulsion Conference; Jul 25, 2016 - Jul 27, 2016; Salt Lake City, UT; United States
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  • 23
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    Overview of Low Emission Combustion Research At NASA Glenn (2016)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: An overview of research efforts at NASA Glenn Research Center (GRC) in low-emission combustion technology that have made a significant impact on the nitrogen oxides (NOx) emission reduction in aircraft propulsion is presented. The technology advancements and their impact on aircraft emissions are discussed in the context of NASA's Aeronautics Research Mission Directorate (ARMD) high-level goals in fuel burn, noise and emission reductions. The highlights of the research presented here show how the past and current efforts laid the foundation for the engines that are flying today as well as how the continued technology advancements will significantly influence the next generation of aviation propulsion system designs.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN31913 , ASME TURBO Expo 2016; Jun 13, 2016 - Jun 17, 2016; Seoul; Korea, Republic of
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  • 24
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    Proposal and Development of a High Voltage Variable Frequency Alternating Current Power System for Hybrid Electric Aircraft (2016)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The development of ultra-efficient commercial vehicles and the transition to low-carbon emission propulsion are seen as thrust paths within NASA Aeronautics. A critical enabler to these paths comes in the form of hybrid-electric propulsion systems. For megawatt-class systems, the best power system topology for these hybrid-electric propulsion systems is debatable. Current proposals within NASA and the Aero community suggest using a combination of AC and DC for power transmission. This paper proposes an alternative to the current thought model through the use of a primarily high voltage AC power generation, transmission, and distribution systems, supported by the Convergent Aeronautics Solutions (CAS) Project. This system relies heavily on the use of dual-fed induction machines, which provide high power densities, minimal power conversion, and variable speed operation. The paper presents background on the project along with the system architecture, development status and preliminary results.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN33090 , AIAA/ASME/SAE/ASEE Joint Propulsion Conference; Jul 25, 2016 - Jul 27, 2016; Salt Lake City, UT; United States
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    Approximation of Engine Casing Temperature Constraints for Casing Mounted Electronics (2016)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The performance of propulsion engine systems is sensitive to weight and volume considerations. This can severely constrain the configuration and complexity of the control system hardware. Distributed Engine Control technology is a response to these concerns by providing more flexibility in designing the control system, and by extension, more functionality leading to higher performing engine systems. Consequently, there can be a weight benefit to mounting modular electronic hardware on the engine core casing in a high temperature environment. This paper attempts to quantify the in-flight temperature constraints for engine casing mounted electronics. In addition, an attempt is made at studying heat soak back effects. The Commercial Modular Aero Propulsion System Simulation 40k (C-MAPSS40k) software is leveraged with real flight data as the inputs to the simulation. A two-dimensional (2-D) heat transfer model is integrated with the engine simulation to approximate the temperature along the length of the engine casing. This modification to the existing C-MAPSS40k software will provide tools and methodologies to develop a better understanding of the requirements for the embedded electronics hardware in future engine systems. Results of the simulations are presented and their implications on temperature constraints for engine casing mounted electronics is discussed.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN33158 , AIAA Joint Propulsion Conference 2016; Jul 25, 2016 - Jul 27, 2016; Salt Lake City, UT; United States
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    Mission Analysis and Aircraft Sizing of a Hybrid-Electric Regional Aircraft (2016)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: No abstract available
    Keywords: Aircraft Propulsion and Power
    Type: NF1676L-23145 , AIAA 2016 SciTech Forum and Exposition; Jan 04, 2016 - Jan 08, 2016; San Diego, CA; United States
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    An Overview of Low-Emission Combustion Research at NASA Glenn (2016)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: An overview of research efforts at NASA Glenn Research Center (GRC) in low-emission combustion technology that have made a significant impact on the nitrogen oxides (NOx) emission reduction in aircraft propulsion is presented. The technology advancements and their impact on aircraft emissions are discussed in the context of NASA's Aeronautics Research Mission Directorate (ARMD) high-level goals in fuel burn, noise and emission reductions. The highlights of the research presented here show how the past and current efforts laid the foundation for the engines that are flying today as well as how the continued technology advancements will significantly influence the next generation of aviation propulsion system designs.
    Keywords: Aircraft Propulsion and Power
    Type: E-19204 , GT2016-56100 , GRC-E-DAA-TN30125 , ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition GT2016; Jun 13, 2016 - Jun 17, 2016; Seoul; Korea, Republic of
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    Enhancement of the Open National Combustion Code (OpenNCC) and Initial Simulation of Energy Efficient Engine Combustor (2016)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: In this paper, we present the recent enhancement of the Open National Combustion Code (OpenNCC) and apply the OpenNCC to model a realistic combustor configuration (Energy Efficient Engine (E3)). First, we perform a series of validation tests for the newly-implemented advection upstream splitting method (AUSM) and the extended version of the AUSM-family schemes (AUSM+-up). Compared with the analytical/experimental data of the validation tests, we achieved good agreement. In the steady-state E3 cold flow results using the Reynolds-averaged Navier-Stokes(RANS), we find a noticeable difference in the flow fields calculated by the two different numerical schemes, the standard Jameson- Schmidt-Turkel (JST) scheme and the AUSM scheme. The main differences are that the AUSM scheme is less numerical dissipative and it predicts much stronger reverse flow in the recirculation zone. This study indicates that two schemes could show different flame-holding predictions and overall flame structures.
    Keywords: Aircraft Propulsion and Power
    Type: AIAA Paper 2016-4651 , GRC-E-DAA-TN34851 , Joint Propulsion Conference; Jul 25, 2016 - Jul 27, 2016; Salt Lake City, UT; United States
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  • 29
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    Enhancement of the Open National Combustion Code (OpenNCC) and Initial Simulation of Energy Efficient Engine Combustor (2016)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: In this paper, we present the recent enhancement of the Open National Combustion Code (OpenNCC) and apply the OpenNCC to model a realistic combustor configuration (Energy Efficient Engine (E3)). First, we perform a series of validation tests for the newly-implemented advection upstream splitting method (AUSM) and the extended version of the AUSM-family schemes (AUSM+-up). Compared with the analytical/experimental data of the validation tests, we achieved good agreement. In the steady-state E3 cold flow results using the Reynolds-averaged Navier-Stokes(RANS), we find a noticeable difference in the flow fields calculated by the two different numerical schemes, the standard Jameson- Schmidt-Turkel (JST) scheme and the AUSM scheme. The main differences are that the AUSM scheme is less numerical dissipative and it predicts much stronger reverse flow in the recirculation zone. This study indicates that two schemes could show different flame-holding predictions and overall flame structures.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN34437 , AIAA/SAE/ASEE Joint Propulsion Conference; Jul 25, 2016 - Jul 27, 2016; Salt Lake City, UT; United States
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    Parallel Hybrid Gas-Electric Geared Turbofan Engine Conceptual Design and Benefits Analysis (2016)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The conceptual design of a parallel gas-electric hybrid propulsion system for a conventional single aisle twin engine tube and wing vehicle has been developed. The study baseline vehicle and engine technology are discussed, followed by results of the hybrid propulsion system sizing and performance analysis. The weights analysis for the electric energy storage & conversion system and thermal management system is described. Finally, the potential system benefits are assessed.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN33024 , AIAA/SAE/ASEE Joint Propulsion Conference, AIAA Propulsion and Energy Forum and Exposition 2016; Jul 25, 2016 - Jul 27, 2016; Salt Lake City, UT; United States
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    Optimizing Power Density and Efficiency of a Double-Halbach Array Permanent-Magnet Ironless Axial-Flux Motor (2016)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: NASA Glenn Research Center is investigating hybrid electric and turboelectric propulsion concepts for future aircraft to reduce fuel burn, emissions, and noise. Systems studies show that the weight and efficiency of the electric system components need to be improved for this concept to be feasible. This effort aims to identify design parameters that affect power density and efficiency for a double-Halbach array permanent-magnet ironless axial flux motor configuration. These parameters include both geometrical and higher-order parameters, including pole count, rotor speed, current density, and geometries of the magnets, windings, and air gap.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN33010 , AIAA/SAE/ASEE Joint Propulsion Conference; Jul 25, 2016 - Jul 27, 2016; Salt Lake City, UT; United States
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  • 32
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    Commercial Supersonics Technology Project - Status of Airport Noise (2016)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The Commercial Supersonic Technology Project has been developing databases, computational tools, and system models to prepare for a level 1 milestone, the Low Noise Propulsion Tech Challenge, to be delivered Sept 2016. Steps taken to prepare for the final validation test are given, including system analysis, code validation, and risk reduction testing.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN31478 , Acoustics Technical Working Group Meeting (Spring 2016); Apr 19, 2016 - Apr 20, 2016; Hampton, VA; United States
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    Hybrid Electric Propulsion Technologies for Commercial Transports (2016)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: NASA Aeronautics Research Mission Directorate has set strategic research thrusts to address the major drivers of aviation such as growth in demand for high-speed mobility, addressing global climate and capitalizing in the convergence of technological advances. Transitioning aviation to low carbon propulsion is one of the key strategic research thrust and drives the search for alternative and greener propulsion system for advanced aircraft configurations. This work requires multidisciplinary skills coming from multiple entities. The Hybrid Gas-Electric Subproject in the Advanced Air Transportation Project is energizing the transport class landscape by accepting the technical challenge of identifying and validating a transport class aircraft with net benefit from hybrid propulsion. This highly integrated aircraft of the future will only happen if airframe expertise from NASA Langley, modeling and simulation expertise from NASA Ames, propulsion expertise from NASA Glenn, and the flight research capabilities from NASA Armstrong are brought together to leverage the rich capabilities of U.S. Industry and Academia.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN30861 , Green Aviation Technical Information Exchange; Mar 29, 2016 - Mar 31, 2016; Hampton, VA; United States
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    Variable Cycle Intake for Reverse Core Engine (2016)
    In:  CASI
    Details
    Publication Date: 2019-08-26
    Description: A gas generator for a reverse core engine propulsion system has a variable cycle intake for the gas generator, which variable cycle intake includes a duct system. The duct system is configured for being selectively disposed in a first position and a second position, wherein free stream air is fed to the gas generator when in the first position, and fan stream air is fed to the gas generator when in the second position.
    Keywords: Aircraft Propulsion and Power
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    Gas Turbine Engine Having Fan Rotor Driven by Turbine Exhaust and with a Bypass (2016)
    In:  CASI
    Details
    Publication Date: 2019-08-26
    Description: A gas turbine engine has a core engine incorporating a core engine turbine. A fan rotor is driven by a fan rotor turbine. The fan rotor turbine is in the path of gases downstream from the core engine turbine. A bypass door is moveable from a closed position at which the gases from the core engine turbine pass over the fan rotor turbine, and moveable to a bypass position at which the gases are directed away from the fan rotor turbine. An aircraft is also disclosed.
    Keywords: Aircraft Propulsion and Power
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    Gas Turbine Engine Inlet Wall Design (2016)
    In:  CASI
    Details
    Publication Date: 2019-08-26
    Description: A gas turbine engine has an inlet duct formed to have a shape with a first ellipse in one half and a second ellipse in a second half. The second half has an upstream most end which is smaller than the first ellipse. The inlet duct has a surface defining the second ellipse which curves away from the first ellipse, such that the second ellipse is larger at an intermediate location. The second ellipse is even larger at a downstream end of the inlet duct leading into a fan.
    Keywords: Aircraft Propulsion and Power
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    Visions of the Future: Hybrid Electric Aircraft Propulsion (2016)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The National Aeronautics and Space Administration (NASA) is investing continually in improving civil aviation. Hybridization of aircraft propulsion is one aspect of a technology suite which will transform future aircraft. In this context, hybrid propulsion is considered a combination of traditional gas turbine propulsion and electric drive enabled propulsion. This technology suite includes elements of propulsion and airframe integration, parallel hybrid shaft power, turbo-electric generation, electric drive systems, component development, materials development and system integration at multiple levels.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN34060 , Aircraft Electric/Hybrid-Electric Power & Propulsion Workshop; Jul 28, 2016; Salt Lake City, UT; United States
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    A Network Scheduling Model for Distributed Control Simulation (2016)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Distributed engine control is a hardware technology that radically alters the architecture for aircraft engine control systems. Of its own accord, it does not change the function of control, rather it seeks to address the implementation issues for weight-constrained vehicles that can limit overall system performance and increase life-cycle cost. However, an inherent feature of this technology, digital communication networks, alters the flow of information between critical elements of the closed-loop control. Whereas control information has been available continuously in conventional centralized control architectures through virtue of analog signaling, moving forward, it will be transmitted digitally in serial fashion over the network(s) in distributed control architectures. An underlying effect is that all of the control information arrives asynchronously and may not be available every loop interval of the controller, therefore it must be scheduled. This paper proposes a methodology for modeling the nominal data flow over these networks and examines the resulting impact for an aero turbine engine system simulation.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN33238 , AIAA/SAE/ASEE Joint Propulsion Conference; Jul 25, 2016 - Jul 27, 2016; Salt Lake City, UT; United States
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    Practical Techniques for Modeling Gas Turbine Engine Performance (2016)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The cost and risk associated with the design and operation of gas turbine engine systems has led to an increasing dependence on mathematical models. In this paper, the fundamentals of engine simulation will be reviewed, an example performance analysis will be performed, and relationships useful for engine control system development will be highlighted. The focus will be on thermodynamic modeling utilizing techniques common in industry, such as: the Brayton cycle, component performance maps, map scaling, and design point criteria generation. In general, these topics will be viewed from the standpoint of an example turbojet engine model; however, demonstrated concepts may be adapted to other gas turbine systems, such as gas generators, marine engines, or high bypass aircraft engines. The purpose of this paper is to provide an example of gas turbine model generation and system performance analysis for educational uses, such as curriculum creation or student reference.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN33214 , AIAA/SAE/ASEE Joint Propulsion Conference; Jul 25, 2016 - Jul 27, 2016; Salt Lake City, UT; United States
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    Alternative Bio-Derived JP-8 Class Fuel and JP-8 Fuel: Flame Tube Combustor Test Results Compared using a GE TAPS Injector Configuration (2016)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: This paper presents results from tests in a flame tube facility, where a bio-derived alternate fuel was compared with JP-8 for emissions and general combustion performance. A research version of General Electric Aviation (GE) TAPS injector was used for the tests. Results include combustion efficiency from gaseous emission measurements, 2D planar laser-based imaging as well as basic flow visualization of the flame. Four inlet test conditions were selected that simulate various engine power conditions relevant to NASA Fundamental Aeronautics Supersonics Project and Environmentally Responsible Aviation Program. One inlet condition was a pilot-only test point. The other three inlet conditions incorporated fuel staging via a split between the pilot and main circuits of either 10%/90% or 20%/80%. For each engine power condition, three fuel mixes were used: 100% JP-8; 100% alternative; and a blend of the two, containing 75% alternative. Results for the inlet cases that have fuel split between pilot and main, indicate that fuel from the pilot appears to be evaporated by the time it reaches the dome exit. Main circuit liquid evaporates within a downstream distance equal to annulus height, no matter the fuel. Some fuel fluorescence images for a 10%/90% fuel staging case show a distinct difference between JP-8 and bio-derived fuel. OH PLIF results indicate that OH forms in a region more centrally-located for the JP-8 case downstream of the pilot, in its central recirculation region (CRZ). For the bio-derived Hydrotreated Renewable Jet (HRJ) fuel, however, we do not see much OH in the CRZ. The OH image structure near the dome exit is similar for the two fuels, but farther downstream the OH in the CRZ is much more apparent for the JP-8 than for the alternate fuel. For all conditions, there was no discernable difference between fuel types in combustion efficiency or emissions.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN33118 , AIAA/SAE/ASEE Joint Propulsion Conference; Jul 25, 2016 - Jul 27, 2016; Salt Lake City, UT; United States
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    A Case for Basic Rotating Detonation Engine Research (2016)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A brief review is provided covering the benefits to air breathing and chemical rocket propulsion found from pressure gain combustion in general, and rotating detonation in particular. Challenges are also identified.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN32567 , DARPA RDE Stakeholders Day; May 26, 2016; Arlington, VA; United States
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    The Application of Hardware in the Loop Testing for Distributed Engine Control (2016)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The essence of a distributed control system is the modular partitioning of control function across a hardware implementation. This type of control architecture requires embedding electronics in a multitude of control element nodes for the execution of those functions, and their integration as a unified system. As the field of distributed aeropropulsion control moves toward reality, questions about building and validating these systems remain. This paper focuses on the development of hardware-in-the-loop (HIL) test techniques for distributed aero engine control, and the application of HIL testing as it pertains to potential advanced engine control applications that may now be possible due to the intelligent capability embedded in the nodes.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN33270 , AIAA/SAE/ASEE Joint Propulsion Conference; Jul 25, 2016 - Jul 27, 2016; Salt Lake City, UT; United States
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  • 43
    Electronic Resource
    Electronic Resource
    Massenspektroskopie und ihre Anwendung auf strukturelle und stereochemische Probleme, LXXVII. Einfluß behinderter Rotation sowie anderer energetischer Faktoren auf die McLafferty-Umlagerung von Ketonen (1966)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 99 (1966), S. 35-41 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Folgende Faktoren beeinflussen den Ablauf zweier konkurrierender McLafferty-Umlagerungen (Übertragung eines γ-ständigen Wasserstoffatoms bei der β-Spaltung von Carbonylverbindungen): 1. Natur des abgespaltenen Olefins, 2. Art des übertragenen Wasserstoffatoms (prim., sek., usw.), 3. behinderte Rotation.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19660990106
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  • 44
    Electronic Resource
    Electronic Resource
    Synthese von N-arylsubstituierten Oxazolidonen-(2) (1966)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 99 (1966), S. 55-61 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Cyclische Carbonate von 1.2-Glykolen reagieren bei hohen Temperaturen mit aromatischen Aminen zu N-arylsubstituierten Oxazolidonen-(2).
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19660990109
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  • 45
    Electronic Resource
    Electronic Resource
    Synthesen stickstoffhaltiger Heterocyclen, XXXIV. Über einige Reaktionen von Amidoximen (1966)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 99 (1966), S. 68-71 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Aus Amidoximen und Phenylborsäureanhydrid entstehen 1.3.5.2-Oxadiazaborole. N-Substituierte Amidoxime reagieren mit Thionylchlorid unter Bildung von 1.2.3.5-Oxathiadiazol-2-oxiden. Phenyldichlorphosphin reduziert Amidoxime und Oxime zu Amidin- bzw. Iminhydrochloriden.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19660990111
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  • 46
    Electronic Resource
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    Synthesen stickstoffhaltiger Heterocyclen, XXXVI. Reaktionen des 1.5-Bis-phenylthiocarbamoyl-thiocarbohydrazids, I (1966)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 99 (1966), S. 81-84 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Cyclisierungsreaktionen von 1.5-Bis-phenylthiocarbamoyl-thiocarbohydrazid mit Alkali sowie mit Pyridin und des Phenylthiocarbamoyl-dithiocarbazidsäureesters mit Hydrazin werden beschrieben. Nur mit NaOH verläuft die Reaktion einheitlich. Mit Pyridin bzw. Hydrazin entstehen vier bzw. drei Reaktionsprodukte nebeneinander, die als verschieden substituierte 1.2.4-Triazole und 1.3.4-Thiadiazole identifiziert und durch Derivate charakterisiert wurden.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19660990113
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  • 47
    Electronic Resource
    Electronic Resource
    Heterocyclen aus CH-aciden Nitrilen, VIII. 2-Amino-thiophene aus methylenaktiven Nitrilen, Carbonylverbindungen und Schwefel (1966)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 99 (1966), S. 94-100 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Aliphatische Ketone, Aldehyde sowie β-Dicarbonylverbindungen reagieren mit methylenaktiven Nitrilen und Schwefel in Gegenwart von Aminen bei Raumtemperatur zu 2-Aminothiophenen.  -  Eine Variante der Synthese, die Einwirkung von Schwefel auf vinyloge methylenaktive Nitrile, gestattet auch die Einbeziehung von Alkylarylketonen in die Reaktion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19660990116
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  • 48
    Electronic Resource
    Electronic Resource
    Hochchlorierte aliphatische Amine und ihre Basizitätsverhältnisse (1966)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 99 (1966), S. 121-129 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Primäre aliphatische Amine R—CH2—NH2, bei denen R eine hochchlorierte gesättigte oder ungesättigte Gruppe ist, werden durch LiAlH4-Reduktion entsprechender Nitrile und Carbonsäureamide sowie durch Gabrielsche Synthese dargestellt und hinsichtlich ihrer Basenkonstanten untereinander und mit anderen nicht halogenierten und fluorierten Aminen verglichen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19660990120
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  • 49
    Electronic Resource
    Electronic Resource
    Polyacetylenverbindungen, XC. Synthese des Thioäthers aus Anthemis carpatica Willd (1966)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 99 (1966), S. 138-141 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Konstitution und Konfiguration des aus Anthemis carpatica Willd. isolierten Thioäthers 1 werden durch Synthese gesichert. Ausgehend von den cis.trans-isomeren Aldehyden 13 und 14 werden durch Wittig-Reaktion alle theoretisch möglichen Isomeren erhalten.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19660990123
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  • 50
    Electronic Resource
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    Polyacetylenverbindungen, XCI. Struktur und Synthese eines C18-Ketoacetats aus Cosmos sulphureus Cav. (1966)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 99 (1966), S. 142-147 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Aus den oberirdischen Teilen von Cosmos sulphureus Cav. wird ein C18-Ketoacetat (5) isoliert, in seiner Struktur geklärt und synthetisch dargestellt. Die mögliche Bedeutung als biogenetische Schlüsselsubstanz wird diskutiert.
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    Selektive Ätherspaltung von 4-Hydroxy-methoxy-chinolincarbonsäureestern (1966)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 99 (1966), S. 160-164 
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    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Bei 4-Hydroxy-polymethoxy-chinolin-carbonsäure-(2)- und -(3)-estern kann mit Bortribromid die Methoxylgruppe an C-5 selektiv und unter Erhaltung der Esterfunktion gespalten werden.
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  • 52
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    Fluorierungen organischer Verbindungen mit Chlortrifluorid, IV. Zur Umsetzung von Chloroform und 1.1-Difluor-1.2.2-trichloräthan (F 122) mit Chlor oder Chlortrifluorid in der GasphaseR. Eckermann, Diplomarb., Techn. Hochschule Hannover 1964. (1966)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 99 (1966), S. 172-177 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Chloroform und 1.1-Difluor-1.2.2-trichlor-äthan (F 122)F 122 (= Frigen 122) als Kurzbezeichnung entspr. Frigen, Freon, Kaltron u. ä. Handelsbezeichnungen®. wurden zwischen 100 und 270° mit ClF3 und zum Vergleich mit elementarem Chlor in der Gasphase umgesetzt. Chloroform reagierte sowohl mit Cl2 als auch mit ClF3 leichter als F 122. Bei der Halogenierung von F 122 macht sich der stabilisierende Einfluß von Halogenatomen in α-Stellung zum substituierbaren H-Atom bemerkbar. Chloroform wird durch ClF3 lediglich fluoriert. Bei der H-Substitution von F 122 betrug das Verhältnis Cl: F der aus dem ClF3 stammenden Halogene in den Reaktionsprodukten etwa 1 : 1, so daß der Rest des Fluors als HF verlorenging. Dies gilt bei vielen organischen Verbindungen für die Halogenierung mit ClF3.
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    Umsetzungen von aliphatischen Diazoverbindungen mit Acetalen, Orthocarbonsäureestern und ihren Schwefelanaloga unter Lewis-Säuren-Katalyse, II. Reaktionen von Diazoessigsäure-äthylester mit Acetalen und Orthocarbonsäure-trialkylestern (1966)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 99 (1966), S. 196-204 
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    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Acetale und Orthocarbonsäure-trialkylester reagieren mit Diazoessigsäure-äthylester in Gegenwart katalytischer Mengen BF3-Ätherat bei Raumtemperatur gemäß Schema (5). Diese Reaktion ergibt eine experimentell einfache Methode zur Überführung von Acetalen und Orthoestern unter Kettenverlängerung in Carbonsäureester.  -  Offenkettige und cyclische Acetale, die nicht nach (5) umgesetzt werden konnten, sind in den „Sonderbesprechungen“ zusammengefaßt; 1.3-Dioxolan liefert bei der Behandlung mit katalytischen Mengen BF3 und wenig Diazoessigester ein festes, farbloses Polymerisat.
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    Acylisocyanid-dichloride und ihre Derivate (1966)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 99 (1966), S. 239-243 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Chlorierung von Acylisothiocyanaten, N-Acyl-dithiocarbamidsäureestern sowie N-Acyl-dithiokohlensäureester-imiden führt zu Acylisocyanid-dichloriden; Phosphorpentachlorid reagiert mit Benzoylisocyanid-dichlorid zu α.α-Dichlor-benzylisocyanid-dichlorid, mit Acylisocyanaten zu N-[α-Chlor-alkyliden]-carbamidsäurechloriden bzw. α.α-Dichlor-alkylisocyanaten. Benzoylisocyanid-dichlorid setzt sich mit Cyclohexylamin zu N.N′-Dicyclohexyl-N″-benzoyl-guanidin, mit Dithioglykol zu 2-Benzoylimino-1.3-dithiolan um.
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    Polarographische Bestimmung der Halbstufenpotentiale von arylierten Phenolen mit der rotierenden Graphitelektrode (1966)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 99 (1966), S. 258-263 
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    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Halbstufenpotentiale zahlreicher arylierter Phenole konnten mit Hilfe einer neu entwickelten rotierenden Graphitelektrode in Acetonitril/Wasser (9:1) in alkalischem Puffer für den Einelektronenübergang zu den Phenoxylen, sowie in Essigsäure/Wasser (9:1) für den Zweielektronenübergang zu den Chinolacetaten anodisch gemessen werden. Die gemessenen Potentiale gehören zu den höchsten durch anodische Polarographie bisher bestimmten.
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    Beiträge zur Chemie der heterocyclischen, pseudobasischen Aminocarbinole, XXXI. Eine neue Isochinolin-Ringschlußreaktion, VIII. Synthese eines Biisochinolyls-(2.2′) (1966)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 99 (1966), S. 273-280 
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    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Hydrazonderivate 2e-h des Cotarnons (1) werden durch katalytische Kaliumcyanid-Mengen in alkalischem Alkohol in das Isochinolinderivat 4 umgewandelt. Cotarn-azin (5) ergibt unter ähnlichen Bedingungen ein Gemisch von 4 und 6, ohne Cyanidkatalysator das Derivat 7 des Biisochinolyls-(2.2′).
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    Die Hydrolyse von Triaryl-acyloxy-silanen (1966)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 99 (1966), S. 301-306 
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    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Triaryl-acyloxy-silane (p-X—C6H4)3Si—O—CO—R (X = H, CH3, CH3O, F, Cl, Br; R = CH3, CH2Cl, C2H5) wurden in tert.-Butylalkohol/Benzol-Lösung hydrolysiert, wobei die Reaktionsgeschwindigkeit an Hand der abgespaltenen Säure bestimmt wurde. Der Einfluß der Substituenten X und R auf die Reaktionsfähigkeit der Si—O-Bindung wurde untersucht und diskutiert.
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    Cyansäureester, VII. Cyansäureester als Dipolarophile bei 1.3-Cycloadditionen (1966)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 99 (1966), S. 317-327 
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    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Cyansäureester (1) addieren an der CN-Dreifachbindung 1.3-Dipole unter Bildung fünfgliedriger heterocyclischer Äther. Mit Natriumazid entstehen aus 1 5-Alkyloxy- bzw. 5-Aryloxytetrazole (5). Die Acylderivate von 5 wirken als Transacylierungsmittel und ergeben bei der Thermolyse 1.3.4-Oxdiazole (7). Diazoverbindungen reagieren mit 1 im Molverhältnis 1:2 zu 4-Aryloxy-N-aryloxycarbimidoyl-1.2.3-triazolen (10), die bei der Hydrolyse 4-Aryloxy-1.2.3-triazole (11) liefern. Aus 1 und Nitriliminen entstehen 1.2.4-Triazole (15) und mit Nitriloxyden werden 1.2.4-Oxdiazole (17) gebildet.
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    Zur Chemie des Furosemids, I. Synthesen von 5-Sulfamoyl-anthranilsäure-Derivaten (1966)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 99 (1966), S. 328-344 
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    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 2.4-Dihalogen-5-sulfamoyl-benzoesäuren und deren funktionelle Derivate reagieren bei erhöhten Temperaturen mit primären und sekundären Aminen, ferner auch mit Ammoniak und Hydrazin, unter Austausch eines Halogenatoms gegen den Rest der betreffenden Basen. Einige der Kondensationsprodukte, insbesondere die 4-Chlor-5-sulfamoyl-N-[furyl-(2)-methyl]-anthranilsäure (1), zeichnen sich durch eine hohe saluretische und diuretische Aktivität aus.
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    Notiz über neue Synthesen von Δ5-B-Nor-cholesten (1966)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 99 (1966), S. 362-363 
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    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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    Notiz zur Darstellung von Stickstofftrifluorid durch Elektrolyse von geschmolzenem Ammoniumhydrogenfluorid (1966)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 99 (1966), S. 371-374 
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    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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    Cyclodien-Insektizide, IV. Synthese und Struktur von Isomeren des Chlordans (1966)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 99 (1966), S. 421-430 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Durch Chlorierung von 4.5.6.7.8.8-Hexachlor-4.7-methano-3a.4.7.7a-tetrahydro-indan unter UV-Licht erhält man ein insektizides Substanzgemisch, das chromatographisch in 6 Verbindungen zerlegt und deren Struktur durch unabhängige Synthesen und H-NMR-Spektren ermittelt wird. Darunter befinden sich die neuen γ-, δ- und ∊-Isomeren des Chlordans. Die insektiziden Eigenschaften der isolierten Verbindungen werden verglichen.
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    Cyclodien-Insektizide, III. Isomerisierung und Chlorierung von Dihydroheptachlor (1966)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 99 (1966), S. 416-420 
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    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Addition von HCl an Chlorden zu den Dihydroheptachlor(DHC)-Isomeren ist eine Gleichgewichtsreaktion. α- und γ-DHC lassen sich zu β-DHC isomerisieren. Durch Chlorieren von β-DHC erhält man Gemische mit verbesserten insektiziden Eigenschaften. Die Zusammensetzung der Gemische wird ermittelt.
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    Zur Synthese substituierter Pyridone durch Dehydrierung (1966)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 99 (1966), S. 445-449 
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    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Beide desmotropen Formen von Piperidon-(4)-dicarbonsäureestern werden mit Chrom(VI)-oxid oder mit Cer(IV)-sulfat zu entsprechend substituierten Pyridonen-(4) dehydriert. Bei ihren N-Alkyl-Derivaten tritt als Nebenreaktion N-Desalkylierung ein. Die Struktur der Pyridone wird IR-spektroskopisch untersucht.
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    Olefin-Gold-Komplexe, II. Gold(I)-chlorid-Komplexe cyclischer Mono-, Di- und Triolefine (1966)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 99 (1966), S. 462-468 
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    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Darstellung und Eigenschaften der Gold(I)-chlorid-Komplexe von Cyclopenten, Cyclohexen, Cyclohepten, cis-Cycloocten, trans-Cyclodecen, Cyclooctadien-(1.5), cis.trans-Cyclodecadien-(1.5), Norbornadien, Dicyclopentadien, cis.cis.trans- und trans.trans.trans-Cyclododecatrien-(1.5.9) werden beschrieben.
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    1.3-Dipolare Cycloadditionen, XXIV. Triazoline aus organischen Aziden und α.β-ungesättigten Carbonylverbindungen oder Nitrilen (1966)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 99 (1966), S. 475-490 
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    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Aromatische Azide und Benzylazid lagern sich an α.β-ungesättigte Carbonester, Ketone und Nitrile so an, daß der elektronenanziehende Substituent in der 4-Stellung des Δ2-1.2.3-Triazolins erscheint. Unter Basenkatalyse gehen die 1-substituierten Δ2-Triazolin-carbonsäure-(4)-methylester vollständig in ringoffene N-substituierte 3-Amino-2-diazo-propionsäureester über, die ihrerseits als aliphatische Diazoverbindungen zur erneuten Cycloaddition an α.β-ungesättigte Carbonester befähigt sind. Aus den Azid-Additionen an Dimethyl-fumarat oder Äthyl-crotonat ließen sich zum Teil nur die offenkettigen Diazokörper oder deren Folgeprodukte isolieren. Bei den Δ2-Triazolinen aus Äthyliden-aceton und Methyl-vinylketon ist die Ringöffnung besonders rasch.  -  Das aus Phenylazid und Acrylnitril hervorgehende 1-Phenyl-4-cyan-Δ2-triazolin setzt sich unter Triäthylamin-Katalyse mit 29% 3-Anilino-2-diazo-propionitril ins Gleichgewicht.
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    Isonitrile, VIII. Darstellung von N.N′-Bis-arylsulfonyl-formamidinen (1966)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 99 (1966), S. 520-523 
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    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Aus N-Formyl-arylsulfonamiden (2) entstehen bei Umsetzung mit Phosphoroxychlorid in Base nicht die erwarteten Sulfonyl-isocyanide, sondern N.N′-Bis-arylsulfonyl-formamidine (3).
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    Versuche mit Epoxiden, IV. Untersuchungen mit Cumaranon-epoxiden (1966)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 99 (1966), S. 531-535 
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    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Unter Einwirkung von Bortrifluorid-ätherat lagert sich das Cumaranon-epoxid 1 zu den isomeren Chroman-dionen 7 und 8 um, unter analogen Versuchsbedingungen ist 8 auch aus dem Cumaranon-epoxid 4 erhältlich. Die thermische Behandlung von 4 führt zu dem Chroman-dion 11. Die Synthese von 4 verläuft über das 2-Diphenylmethylen-cumaranon-(3) (3), welches gemäß Schema A und B erhalten wird.
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    Synthese und Struktur von Chinoxalin-glucosiden (1966)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 99 (1966), S. 547-555 
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    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 2-Oxo-dihydrochinoxaline reagieren sowohl nach der Fischer-Helferich- als auch nach der Quecksilbersalz-Methode unter selektiver O-Substitution in hohen Ausbeuten zu 2-Glucosyloxy-chinoxalinen. Sterische Faktoren, insbesondere die Anwesenheit des peri-ständigen H-Atoms, werden für das Ausbleiben einer N-Glykosidierung verantwortlich gemacht. Aus denselben Gründen blieb auch die Anwendung der Hilbert-Johnson-Reaktion sowie ihre Modifizierung nach Birkofer in der Chinoxalinreihe ohne Erfolg.
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    Darstellung und thermische Stabilität von 1-Chlor-2.2-diaryl-vinyllithium-Verbindungen (1966)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 99 (1966), S. 680-688 
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    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Metallierungsgeschwindigkeiten der kernsubstituierten Diarylhalogenäthylene 1 und Stabilität der resultierenden Lithiumorganyle 2 wachsen in der Reihe CH3O 〈 CH3 〈 H 〈 Cl und ortho 〈 para. Die mechanistischen Konsequenzen für die Fritsch-Buttenberg-Wiechell-Umlagerung werden diskutiert. Bei dem o-Methoxyderivat 2c konkurriert mit der Umlagerung die Cyclisierung zu einem Benzofuranderivat, welche als elektrophile Reaktion des metallierten Kohlenstoffes angesehen wird.
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    Umlagerungen vinyloger Carbonsäurechloride, II. Weitere Untersuchungen zur thermischen Umlagerung und zum Reaktionsverhalten von Perchlorpentadien-(1.3)-al-(5) (1966)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 99 (1966), S. 698-708 
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    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Reines Perchlorpentadien-(1.3)-al-(5) (1) lagert sich in siedendem Tetrachlorkohlenstoff innerhalb von 4 Stunden quantitativ in 1H-Tetrachlor-pentadien-(1.3)-säure-(5)-chlorid (2) um. Unter Alkalieinwirkung erfährt 1 neben der Haloformspaltung eine Fragmentierung zu Perchlorbutenin. Weitere Reaktionen von 1 und 2 werden beschrieben und in ihrem Verlauf geklärt. Das Hydroxylaminderivat von 1 ist 2.3.4.5-Tetrachlor-pyridin-N-oxid, das von 2 eine O-Acyl-hydroxamsäure, die bei der Hydrolyse zu 3.4.5-Trichlor-N-hydroxy-pyridon-(2) cyclisiert. Dem Aldehyd 1, der zugehörigen Carbonsäure und einigen verwandten Verbindungen wird auf Grund ihres Reaktionsverhaltens die cis-Konfiguration zugesprochen.
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    Masthead (1966)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 99 (1966) 
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    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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    Silylazide, V. Darstellung, Eigenschaften und Struktur einiger Silylazide (1966)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 99 (1966), S. 740-749 
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    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Durch Umsetzung von Silylhalogeniden mit Lithiumazid in Tetrahydrofuran bzw. mit Natriumazid in Pyridin lassen sich Silylazide in guten Ausbeuten gewinnen. Eigenschaften sowie Infrarotspektren und Strukturprobleme einer Reihe nach dieser Methode dargestellter Silylazide werden beschrieben.
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    Über die Si—N-Bindung, XXII. Die Darstellung von N.N-Bis-trimethylsilyl-aminen (1966)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 99 (1966), S. 776-779 
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    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Sterisch wenig gehinderte prim. Amine, Alkylendiamine, Aminoalkohole und Aminosäuren reagieren mit Trimethylsilyl-diäthylamin in Gegenwart von wenig (NH4)2SO4 zu den entsprechenden N.N-Bis-trimethylsilyl-Derivaten, die sich mit Ausnahme des Aminosäure-Derivates durch bemerkenswerte Hydrolysebeständigkeit auszeichnen.
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  • 75
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    Über Piperidoncarbonsaureester und Derivate (1966)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 99 (1966), S. 801-805 
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    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Für die Darstellung von Piperidondicarbonsäureestern des Typs 1 und 2 werden Bedingungen angegeben, die über 90% Ausbeute liefern. Die Ketoformen 1a-4a geben entgegen anderen Angaben Oxime, 3a und 4a auch Phenylhydrazone, die aber äußerst sauerstoffempfindlich sind.
    Type of Medium: Electronic Resource
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    Potentielle Cytostatica, 6. Konfiguration und Derivate von 1-Methylamino-1-desoxy-zuckeralkoholen aus Aldohexosen und Aldopentosen (1966)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 99 (1966), S. 812-822 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Durch Hydrieren von Aldosen und Methylamin erhält man 1-Methylamino-1-desoxy-zuckeralkohole mit einer den eingesetzten Aldosen analogen Konfiguration. Durch Addition an 4-Brom-phenyl- und 4-[Bis-(2-chlor-äthyl)-amino]-phenyl-isothiocyanat bzw. Phenyl- und 4-[Bis-(2-chlor-äthyl)-amino]-phenyl-isocyanat werden Thioharnstoff- und Harnstoff-Derivate gewonnen.
    Additional Material: 4 Tab.
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    URL: http://dx.doi.org/10.1002/cber.19660990314
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  • 77
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    Über Alkylierungs- und Acylierungsreaktionen von Methantricarbonsäureestern (1966)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 99 (1966), S. 879-884 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Alkylierungen von Natrium-methantricarbonsäure-trimethylester mit Methyl-, Allyl- und Propargylhalogenid, mit α-chlorierten Äthern und Thioäthern, β-Dialkylamino-äthylchloriden, Chlormethyl-acetat und α-Halogenketonen, ferner Umsetzungen mit Carbonsäure- und Dicarbonsäure-chloriden, mit Phosgen und Methansulfochlorid werden beschrieben, sowie weitere Umsetzungen der erhaltenen Produkte.
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  • 78
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    Synthese und Eigenschaften substituierter Divinyläther und Divinylthioäther (1966)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 99 (1966), S. 642-652 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Synthese von β.β′-disubstituierten Divinyläthern und Divinylthioäthern durch Wittig-Reaktion wird beschrieben. Die entstehenden cis.trans-Isomeren werden getrennt und durch ihre IR- und NMR-Spektren charakterisiert. Die arylsubstituierten Divinyläther sind beständige Verbindungen und werden selbst durch Kochen mit starken Säuren nicht oder nur langsam gespalten.
    Additional Material: 2 Ill.
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    Über Verbindungen mit Urotropin-Struktur, XXXIV. Herstellung und Säurespaltung des Adamantantrions-(2.4.6) (1966)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 99 (1966), S. 920-924 
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    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Ausgehend von Adamantandion-(4.8)-carbonsäure-(2)-methylester wurde in einer 7-Stufen-Reaktion Adamantantrion-(2.4.6) erhalten. Die Säurespaltung dieses Triketons lieferte 1-[2-Carboxy-äthyl]-cyclohexanon-(2)-carbonsäure-(5), deren Konstitution durch eine unabhängige Synthese sichergestellt wurde.
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  • 80
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    Über die Einwirkung von Enaminen auf Chinone, VII. Darstellung von substituierten 5-Amino-indolen (1966)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 99 (1966), S. 939-943 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Aus p-Benzochinon-bis-dimethylsulfamoylimin (1) und Enaminen bilden sich substituierte 5-Dimethylsulfamoylamino-2-piperidino(morpholino)-2.3-dihydro-indole (2), aus denen sich das Amin in 2-Stellung leicht eliminieren läßt. 1 reagiert ebenfalls mit dem Enolat des Acetessigaldehyds in Dimethylformamid oder Dimethylsulfoxid zu 5-Dimethylsulfamoylamino-1-dimethylsulfamoyl-3-acetyl-indol (3f). Die Schutzgruppe in 1-Stellung am Indolring ist generell leicht abspaltbar, in 5-Stellung gelang die Spaltung noch nicht.
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    URL: http://dx.doi.org/10.1002/cber.19660990333
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  • 81
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    Notiz zur Nitrierung von 2.3.6-Tribrom-hydrochinon-4-methyläther (1966)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 99 (1966), S. 714-715 
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    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19660990248
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  • 82
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    Acyl-lacton-Umlagerung, XXXV. Die protonkatalysierte Umlagerung von Anhydro-dilactamen zu Diazaspiranen (1966)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 99 (1966), S. 724-736 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 2′-Oxo-2.3′-diaza-bicycloalkylidene werden durch Einwirkung von Hydroxonium-Ionen (pK 〈 2) zu Diaza-spiroalkanen umgelagert. Die Umlagerungsfähigkeit der Anhydro-dilactame wird in Abhängigkeit von der Ringgröße untersucht und der Reaktionsmechanismus diskutiert.
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  • 83
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    Darstellung von Iminen durch Einwirkung von flüssigem Ammoniak auf geminale Dihalogenide (1966)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 99 (1966), S. 1015-1018 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Imine der allgemeinen Formel RR′C=NH erhält man durch Umsetzung von reaktions-fähigen geminalen Dihalogeniden mit flüssigem Ammoniak in meist über 90% Ausbeute. Die NMR-Spektren der Imine 2a-2c und 3 werden besprochen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19660990342
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    Chemie der Cyansäureester, XII. Umsetzung von Cyansäureestern mit Sulfonsäuren und Sulfonsäurederivaten bzw. mit Pseudohalogenwasserstoffen (1966)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 99 (1966), S. 958-975 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Sulfonsäuren werden von Cyansäureestern (1) in die Anhydride übergeführt. Sulfonsäureamide addieren sich an 1 zu Kohlensäureester-imid-sulfonamiden (6), die mit Aminen in Guanidine (7) übergeführt werden können. Sulfonsäure-hydrazide reagieren mit 1 im Molverhältnis 1:1 zu Kohlensäureester-imid-hydrazid-Derivaten (10, 11), im Molverhältnis 1:2 zu Bis-kohlensäureester-imid-Derivaten (13) bzw. Amino-triazolen (15, 16).  -  Cyansäure setzt sich mit 2 Moll. 1 zu Bis-aryl-cyanuraten (24) um, während 2 Moll. Rhodanwasserstoffsäure und 1 Mol. 1 2-Aroxy-4.6-dimercapto-s-triazine (26) bilden.
    Additional Material: 9 Tab.
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  • 85
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    Polyacetylenverbindungen, XCVI. Über die Biogenese der Spiroketalenolätherpolyine (1966)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 99 (1966), S. 990-994 
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    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Biogenese der im Tribus Anthemideae weit verbreiteten Spiroketalenolätherpolyine wird sowohl für die 5-Ring- als auch für die 6-Ringverbindungen durch in vitro-Synthese unter sehr milden Bedingungen wahrscheinlich gemacht. Durch Verfütterung markierter Verbindungen läßt sich diese Annahme sicherstellen.
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    Über Silikone, CIV. Methoxylierung, Methylierung und Reduktion von trichlorsilyl-substituierten Methanen und Chlormethanen (1966)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 99 (1966), S. 793-800 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Während die Methoxylierung der Trichlorsilylmethane und -chlormethane außer beim Tetrakis-trichlorsilyl-methan ohne Nebenreaktionen zu den erwarteten Methoxylierungsprodukten führt, traten bei der Methylierung, vor allem der am Kohlenstoff perchlorierten Ausgangs-verbindungen, Reduktion und Substitution der CCl-Bindung ein. Reduktion von Bis-trichlorsilyl-chlormethan mit LiAlH4 ergab Disilylmethan.
    Additional Material: 5 Tab.
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  • 87
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    Synthesen mit Enaminen, X. Systematische Synthese methylverzweigter Carbonsäuren (1966)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 99 (1966), S. 823-842 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Methode der Kettenverlängerung von Carbonsäuren um 5 oder 6 C-Atome wird auf ihre Eignung zum Aufbau methylverzweigter Carbonsäuren untersucht. Das Studium jedes einzelnen Reaktionsschrittes ermöglicht es, ohne Reinigung von Zwischenstufen mit ∼50% Ausbeute Carbonsäuren aufzubauen, die mit Ausnahme der 3-Stellung in jeder Position eine Methylgruppe tragen können. Von entscheidender Bedeutung ist die Beeinflußbarkeit der Spaltungsrichtung von 2-Methyl-2-acyl-cyclohexanonen durch die Reaktionsbedingungen.
    Additional Material: 10 Tab.
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  • 88
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    1-Amino-tetrazol (1966)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 99 (1966), S. 850-855 
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    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1-Amino-tetrazol (3) entsteht praktisch quantitativ durch hydrolytische Spaltung von 1-Benzylidenamino-tetrazol (2), das aus Benzaldehyd-[2-äthoxymethylen-hydrazon] (1) und Natriumazid in Eisessig leicht zugänglich ist. Auf die gleiche einfache Weise wie 2 läßt sich auch, von N-Phenyl-formimidsäure-äthylester ausgehend, 1-Phenyl-tetrazol (13) darstellen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19660990317
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  • 89
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    Heterocyclen durch Abfangreaktionen an geöffneten Acyl-lactonen, I. 5-[2-Mercapto-äthyl]- und 5-[3-Mercapto-propyl]-6-hydroxy-pyrimidine und deren Ringschluß zu 5.6-Dihydro-thiopheno- und 6.7-Dihydro-5 H-thiopyrano[2.3-d]pyrimidinen (1966)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 99 (1966), S. 872-878 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Durch Abfangreaktion alkoholytisch geöffneter α-Acyl- und α-Cyan-γ- und δ-thiol-lactone mit geminalen Diaminen wie z. B. Guanidin oder Acetamidin erhält man 5-[2-Mercaptoäthyl]- und 5-[3-Mercapto-propyl]-6-hydroxy-pyrimidine. In Polyphosphorsäure tritt Ringschluß dieser Verbindungen zu 5.6-Dihydro-thiopheno- und 6.7-Dihydro-5 H-thiopyrano-[2.3-d]pyrimidinen ein.
    Type of Medium: Electronic Resource
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    Über kationische Kohlenoxidkomplexe, VII. Reaktionsweisen von Rhenium (I)-Kohlenoxidkomplexen und neue Anschauungen über den Mechanismus der Basenreaktion von Metallcarbonylen (1966)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 99 (1966), S. 1153-1167 
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    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Bei den Umsetzungen von Rhenium(I)-Kohlenoxidkomplexen mit verschiedensten Carbonylmetallaten konnten im wesentlichen 2 Reaktionstypen festgestellt werden. Einerseits ließen sich in geeigneten Lösungsmittelsystemen weitere Carbonylsalze [Re(CO)4L2][Me(CO)nL′] (L2 = 2 CO, 2 P(C6H5)3, o-Phenanthrolin; Me = V, Mn, Fe, Co; L′ = CO, NO) fassen, andererseits wurden infolge einer Redoxreaktion zwischen Carbonyl-Kation und Carbonylmetallat gemäß \documentclass{article}\pagestyle{empty}\begin{document}$$ [{\mathop{\rm Re}\nolimits}{\rm (CO)}_{\rm 4}{\rm L}_2]^ \oplus \; + \;[{\rm Me(CO)}_{\rm n}]^\Theta \; \to \;{\rm L}_{\rm 2}{\rm (CO)}_{\rm 3}{\mathop{\rm Re}\nolimits} - {\rm Me(CO)}_{\rm n} \; + \;{\rm CO} $$\end{document} gemischte Metallcarbonyle mit einer einfachen Metall-Metall-Bindung erhalten. Dieses sehr allgemein anwendbare Reaktionsprinzip lieferte hier die Metallcarbonyle (CO)5 Re—Mn(CO)5, (CO)5Re—Co(CO)4 und deren o-Phenanthrolinderivate. IR-Spektren und Struktur der Verbindungen werden diskutiert. - Natrium-pentacarbonylrhenat(-I) bildet mit Chlorameisensäure-äthylester das flüchtige Carboäthoxopentacarbonylrhenium, das von Chlorwasserstoff in Carbonyl-Kation und Äthanol gespalten wird: Anhand der Reaktionsweise kationischer Kohlenoxidkomplexe von Mangan(I) und Rhenium(I) mit Alkoholaten und Hydroxyl-Ionen wird eine neue Anschauung über die Basen-reaktion neutraler Metallcarbonyle mit Alkalilaugen entwickelt. Als einleitender Schritt wird der nuceophile Angriff eines Hydroxyl-Ions am C-Atom eines CO-Liganden postuliert.
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    Synthesen cycloaliphatischer Ketone aus Cyclododecatrien-(1.5.9), I. Die Reaktion von Cyclododecatrien-(1c.5t.9t)Bei nachgestellten Stellungsangaben besagen die Buchstaben c bzw. t neben der Ziffer, daß die vom betreffenden Kohlenstoffatom ausgehende Doppelbindung cis- bzw. trans-Konfiguration besitzt; s. dazu Beilsteins Handb. der organ. Chemie, III. Ergänzungswerk. mit Dichlorcarben (1966)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 99 (1966), S. 1192-1197 
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    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Bei der Reaktion mit Dichlorcarben zeigen die Doppelbindungen des Cyclododecatriens-(1c.5t.9t) unterschiedliche Reaktivität. Während in erster Stufe bevorzugt eine trans-Doppelbindung reagiert, erfolgt dann selektiv Angriff der cis-Doppelbindung. Mit 1, 3, 5 und 7 wurden Verbindungen zugänglich, die zur Synthese von 13-, 14- und 15-Ring-Verbindungen dienen können.
    Additional Material: 1 Tab.
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  • 92
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    Versuche zur Darstellung von 2.5-Diphenyl-3.4-diazabicyclo[4.2.0]octadien-(2.4) (1966)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 99 (1966), S. 1229-1231 
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    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Versuche zur Synthese von 2.5-Diphenyl-3.4-diaza-bicyclo[4.2.0]octadien-(2.4) (4) werden beschrieben. Diese Verbindung kann nicht isoliert werden. Sie geht spontan unter Dehydrierung in das Cyclobuteno-pyridazin 5 über.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19660990423
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    Über die Umsetzung von Carbonylverbindungen mit Säurechloriden in Gegenwart tertiärer AmineEin Teil dieser Arbeit wurde 1962 zum Patent angemeldet. (1966)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 99 (1966), S. 1245-1251 
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    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Genügend polarisierte Carbonylverbindungen ergeben mit zur Ketenbildung befähigten Carbonsäurechloriden in Gegenwart stark basischer tertiärer Amine β-Lactone, in Gegenwart schwach basischer tertiärer Amine acyclische Addukte. Mit analogen Sulfonsäurechloriden bilden sich entsprechend β-Sultone. Neben 1:1-Cycloaddukten können auch solche im Molverhältnis 2:1 bzw. 1:2 isoliert werden.
    Additional Material: 1 Tab.
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    Über Thioacyl-isocyanate, IV. Mercapto-thiocarbonyl-isocyanate und ihre Umlagerung zu Mercapto-carbonyl-senfölen (1966)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 99 (1966), S. 1258-1265 
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    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 2-[Alkyl(Aryl-)mercapto]-thiazolin-dione-(4.5) bilden unter thermischer CO-Eliminierung Alkyl(Aryl-)mercapto-thiocarbonyl-isocyanate, die zu 1.4-Heterocycloadditionen befähigt sind und sich im allgemeinen schnell in Alkyl(Aryl-)mercapto-carbonyl-senföle umlagern. Für letztere Reaktion wurde mit Hilfe von 14C-Isotopen-Versuchen der Mechanismus einer monomolekularen 1.3-Umlagerung wahrscheinlich gemacht.
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    URL: http://dx.doi.org/10.1002/cber.19660990429
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    Reaktionen mit Phosphinalkylenen, XII. Eine neue Synthese von Allen-carbonsäureestern (1966)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 99 (1966), S. 1198-1207 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Bei der Umsetzung von Säurechloriden RR′CH—COCl mit zwei Molekülen eines stabilen Ylids entstehen Allencarbonsäure-äthylester. Die Reaktion verläuft über eine γ-Eliminierung an einem intermediär gebildeten Phosphoniumsalz.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19660990417
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    Polyacetylenverbindungen, XCVIII. Über phenolisch substituierte natürliche Acetylenverbindungen (1966)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 99 (1966), S. 1223-1225 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Aus Coreopsis tinctoria Nutt. lassen sich neben bereits bekannten Verbindungen zwei Phenolderivate isolieren, deren Strukturen biogenetisch interessant sind.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19660990421
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  • 97
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    Kernresonanzuntersuchungen an Bor-Verbindungen, I. 11B-Kernresonanzspektren von Boranen mit Substituenten aus der ersten Achterperiode des Periodensystems (1966)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 99 (1966), S. 1049-1067 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Systematische Untersuchungen zur 11B-Kernresonanz an Verbindungen vom Typ Me[BX4] und BX3-(n + m)YnZm (X, Y, Z = H, R, NHR, NR2, OR, F und in einigen Fällen Cl, Br, J) sowie deren Trimethylamin-Addukten ergeben, daß sich die chemische Verschiebung δ11B nicht additiv aus Ligandeninkrementen abschätzen läßt. Bei [BX4]⊖-Verbindungen ist δ11B sowohl von der Elektronegativität als auch von Anisotropie-Effekten der Liganden bestimmt, während bei den dreibindigen Bor-Verbindungen die π-Wechselwirkung einen entscheidenden Beitrag zur chemischen Verschiebung beisteuert. δ11B wird hauptsächlich von den ‚Erstliganden‘ bestimmt, d. h. jenen Atomen, die direkt an das Boratom gebunden sind. Sie ist auf Grund empirisch ermittelter Faktoren vorauszusagen und besitzt deshalb analytischen Wert.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19660990347
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  • 98
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    Hydroxylamin-Derivate, XXIX. Zur Kenntnis der 1-Alkoxy-2.4-dioxo-azetidine (1966)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 99 (1966), S. 1292-1298 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Disubstituierte Malonylchloride geben mit Alkoxyaminen 1-Alkoxy-2.4-dioxo-azetidine (N-Alkoxy-malonimide); im Gegensatz zur entsprechenden Umsetzung in der Hydrazinreihe ist Dimethyl- dem Diäthylmalonylchlorid nicht unterlegen. Aus (mono-) Äthylmalonylchlorid und Methoxyamin wurde nur Äthylmalonsäure-bis-methoxyamid erhalten. Reduktion der N-Alkoxy-malonimide mit Lithiumalanat führt unter Ringspaltung und Erhalt einer Säureamidgruppe zu β-Hydroxy-hydroxamsäure-Derivaten; im Gegensatz dazu wurden bei der Reduktion von N-Methoxy- und N-Hydroxy-succinimid die entsprechenden Derivate des Pyrrolidins gefaßt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19660990435
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  • 99
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    Über Verbindungen mit Urotropin-Struktur, XXXVI. Ringschlußreaktionen zum Ringsystem des 2-Oxa-adamantans (1966)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 99 (1966), S. 1435-1438 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Das aus 3-Methylen-bicyclo[3.3.1]nonanon-(7) (1) durch Lithiumalanat-Reduktion erhältliche 3-Methylen-bicyclo[3.3.1]nonanol-(7) (2) geht mit Säuren in 1-Methyl-2-oxa-adamantan (3) über. 1 erleidet mit Quecksilberacetat einen ähnlichen Ringschluß unter Bildung von 3-Hydroxy-1-acetoxymercurimethyl-2-oxa-adamantan (4), das in 3-Hydroxy-1-methyl-2-oxa-adamantan (6) überführbar ist. Diese Verbindung entsteht auch bei der Einwirkung von Methyllithium oder Methylmagnesiumjodid auf Bicyclo[3.3.1]nonandion-(3.7). Analog reagieren auch andere metallorganische Verbindungen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19660990502
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  • 100
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    IR-Spektroskopische Untersuchung der Kationotropie des Magnesiumacetessigesters in Chloroformlösung (1966)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 99 (1966), S. 1518-1522 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Durch Untersuchung der Intensitätsänderung der charakteristischen IR-Absorptionsbanden für die verschiedenen Formen des Magnesiumacetessigesters in Chloroformlösung in Abhängigkeit von der Zeit und der Konzentration wurden neue Beweise für das Vorliegen von Kationotropie gefunden.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19660990515
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