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  • Organic Chemistry  (391)
  • Aerodynamics  (21)
  • Elasticity
  • 1950-1954  (412)
  • 1935-1939
  • 1953  (412)
  • 1
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    Performance Characteristics of Plane-Wall Two-Dimensional Diffusers (1953)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Experiments have been made at Stanford University to determine the performance characteristics of plane-wall, two-dimensional diffusers which were so proportioned as to insure reasonable approximation of two-dimensional flow. All of the diffusers had identical entrance cross sections and discharged directly into a large plenum chamber; the test program included wide variations of divergence angle and length. During all tests a dynamic pressure of 60 pounds per square foOt was maintained at the diffuser entrance and the boundary layer there was thin and fully turbulent. The most interesting flow characteristics observed were the occasional appearance of steady, unseparated, asymmetric flow - which was correlated with the boundary-layer coalescence - and the rapid deterioration of flow steadiness - which occurred as soon as the divergence angle for maximum static pressure recovery was exceeded. Pressure efficiency was found to be controlled almost exclusively by divergence angle, whereas static pressure recovery was markedly influenced by area ratio (or length) as well as divergence angle. Volumetric efficiency. diminished as area ratio increased, and at a greater rate with small lengths than with large ones. Large values of the static-pressure-recovery coefficient were attained only with long diffusers of large area ratio; under these conditions pressure efficiency was high and. volumetric efficiency low. Auxiliary tests with asymmetric diffusers demonstrated that longitudinal pressure gradient, rather than wall divergence angle, controlled flow separation. Others showed that the addition of even a short exit duct of uniform section augmented pressure recovery. Finally, it was found that the installation of a thin, central, longitudinal partition suppressed flow separation in short diffusers and thereby improved pressure recovery
    Keywords: Aerodynamics
    Type: NACA-TN-2888
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  • 2
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    Theoretical Performance Characteristics of Sharp Lip Inlets at Subsonic Speeds (1953)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A method is presented for the estimation of the subsonic-flight-speed characteristics of sharp-lip inlets applicable to supersonic aircraft. The analysis, based on a simple momentum balance consideration, permits the computation of inlet pressure recovery - mass-flow relations and additive-drag coefficients for forward velocities from zero to the speed of sound. The penalties for operation of a sharp-lip inlet at velocity ratios other than 1.0 may be severe; at lower velocity ratios an additive drag is incurred that is not cancelled by lip suction, while at higher velocity ratios, unavoidable losses in inlet total pressure will result. In particular, at the take-off condition, the total pressure and the mass flow for a choked inlet are only 79 percent of the values ideally attainable with a rounded lip. Experimental data obtained at zero speed with a sharp-lip supersonic inlet model were in substantial agreement with the theoretical results.
    Keywords: Aerodynamics
    Type: NACA-TN-3004
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  • 3
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    On the Development of Turbulent Wakes from Vortex Streets (1953)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Wake development behind circular cylinders at Reynolds numbers from 40 to 10,000 was investigated in a low-speed wind tunnel. Standard hotwire techniques were used to study the velocity fluctuations. The Reynolds number range of periodic vortex shedding is divided into two distinct subranges. At R = 40 to 150, called the stable range, regular vortex streets are formed and no turbulent motion is developed. The range R = 150 to 300 is a transition range to a regime called the irregular range, in which turbulent velocity fluctuations accompany the periodic formation of vortices. The turbulence is initiated by laminar-turbulent transition in the free layers which spring from the separation points on the cylinder. This transition first occurs in the range R = 150 to 300. Spectrum and statistical measurements were made to study the velocity fluctuations. In the stable range the vortices decay by viscous diffusion. In the irregular range the diffusion is turbulent and the wake becomes fully turbulent in 40 to 50 diameters downstream. It was found that in the stable range the vortex street has a periodic spanwise structure. The dependence of shedding frequency on velocity was successfully used to measure flow velocity. Measurements in the wake of a ring showed that an annular vortex street is developed.
    Keywords: Aerodynamics
    Type: NACA-TN-2913
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  • 4
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    The Base Pressure at Supersonic Speeds on Two-Dimensional Airfoils and Bodies of Revolution (With and Without Fins) Having Turbulent Boundary Layers (1953)
    In:  CASI
    Details
    Publication Date: 2019-08-17
    Description: An analysis has been made of available experimental data to show the effects of most variables that are predominant in determining base pressure at supersonic speeds. Two dimensional bases and bases of bodies of revolution, restricted to turbulent boundary layers, are covered.
    Keywords: Aerodynamics
    Type: NACA-RM-L53C02
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  • 5
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    Elastic Buckling under Combined Stresses of Flat Plates with Integral Waffle-Like Stiffening (1953)
    In:  CASI
    Details
    Publication Date: 2019-07-11
    Description: Theory and experiment were compared and found in good agreement for the elastic Buckling under combined stresses of long flat plates with integral waffle-like stiffening in a variety of configurations. For such flat plates, 45deg waffle stiffening was found to be the most effective of the configurations for the proportions considered over the widest range of combinations of compression and shear.
    Keywords: Aerodynamics
    Type: NACA-RM-L53J27
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  • 6
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    Rocket-Model Measurements of Zero-Lift Damping in Roll of the Bell MX-776 Missile at Mach Numbers from 0.6 to 1.56 (1953)
    In:  CASI
    Details
    Publication Date: 2019-07-11
    Description: The zero-lift damping in roll of the Bell MX-776 missile has been measured by a sting-mounted rocket-model technique at Mach numbers from 0.6 to 1.56. The damping-in-roll data, in general, show no unusual variation with Mach number. Aileron rolling-moment effectiveness derived from these data and previously obtained rolling-effectiveness data appear reasonable,
    Keywords: Aerodynamics
    Type: NACA-RM-SL54A13
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  • 7
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    Lateral Oscillatory Characteristics of the Republic F-91 Airplane Calculated by Using Low-Speed Experimental Static and Rotary Derivatives (1953)
    In:  CASI
    Details
    Publication Date: 2019-07-11
    Description: The present investigation was conducted to determine, from low-speed tests in the Langley stability tunnel, the static and rotary derivatives of a 1/9-scale model of the Republic F-91 airplane and various of its components (including the effects of wing incidence) and to determine the accuracy with which the period and damping of the lateral oscillation of the airplane could be calculated by using these experimentally between flight and calculated period and damping of the lateral oscillation were made for Mach numbers from 0.4 to 0.9 at an altitude of 20,OOO feet for 0deg wing incidence and several other wing incidences. Some comparisons were made of the static and rotary derivatives of the model and derivatives estimated by available procedures. determined derivatives (corrected for Mach number effects). Comparisons The results of the investigation have indicated that the model did not have unusual aerodynamic characteristics except for a large (about -0.125) increment in the damping in yaw contributed by the fuselage. Changes in wing incidence, in general, had little effect on the static and rotary derivatives of the model. The static and rotary derivatives of the model could be estimated with good accuracy only in the low angle-of-attack range by using available procedures.
    Keywords: Aerodynamics
    Type: NACA-RM-L53G01
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  • 8
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    An Exploratory Investigation of Some Types of Aeroelastic Instability of Open and Closed Bodies of Revolution Mounted on Slender Struts (1953)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: Aeroelastic instability phenomena of isolated open and closed rigid bodies of revolution free to move under elastic restraint have been investigated experimentally at low speeds by means of models suspended at zero angles of attack and yaw on slender flexible struts from a wind tunnel ceiling. Three types of instability were observed - flutter similar to classical bending-torsion flutter, divergence, and an uncoupled oscillatory instability which consists in nonviolent continuous or intermittent small-amplitude oscillations involving only angular deformations. The speeds at which this oscillatory instability starts were found to be as low as about one-third of the speed at flutter or divergence and to depend on the shape of the body, particularly that of the afterbody, and on the relative location of the elastic axis. An attempt has been made to calculate the airspeeds and, in the case of the oscillatory phenomena, the frequencies at which these instabilities occur by using slender-body theory for the aerodynamic forces on the bodies and neglecting the aerodynamic forces on the struts. However, the agreement between the speeds and frequencies calculated in this manner and those actually observed has been found to be generally unsatisfactory; with the exception of the frequencies of the uncoupled oscillations which could be predicted with fair accuracy. The nature of the observed phenomena and of the forces on bodies of revolution suggests that a significant improvement in the accuracy of analytical predictions of these aeroelastic instabilities can be had only by taking into account the effects of boundary-layer separation on the aerodynamic forces.
    Keywords: Aerodynamics
    Type: NACA-RM-L53E07
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  • 9
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    Flight Test Results of Rocket-Propelled Buffet-Research Models Having 45 Degree Sweptback Wings and 45 Degree Sweptback Tails Located in the Wing Chord Plane (1953)
    In:  CASI
    Details
    Publication Date: 2019-07-11
    Description: Three rocket-propelled buffet-research models have been flight tested to determine the buffeting characteristics of a swept-wing- airplane configuration with the horizontal tail operating near the wing wake. The models consisted of parabolic bodies having 45deg sweptback wings of aspect ratio 3.56, at aspect ratio of 0.3, NACA 64A007 airfoil sections, and tail surfaces of geometry and section identical to the wings. Two tests were conducted with the horizontal tail located in the wing chord plane with fixed incidence angles of -1.5deg on one model and 0deg on the other model. The third test was conducted with no horizontal tail. Results of these tests are presented as incremental accelerations in the body due to buffeting, trim angles of attack, trim normal- and side-force coefficients, wing-tip helix angles, static-directional-stability derivatives , and drag coefficients plotted against Mach number. These data indicate that mild low-lift buffeting was experienced by all models over a range of Mach number from approximately 0.7 to 1.4. It is further indicated that this buffeting was probably induced by wing-body interference and was amplified at transonic speeds by the horizontal tail operating in the wing wake. A longitudinal trim change was encountered by the tail-on models at transonic speeds, but no large changes in side force and no wing dropping were indicated.
    Keywords: Aerodynamics
    Type: NACA-RM-L53I10
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  • 10
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    Investigation of the Attenuation of Plane Shock Waves Moving over very Rough Surfaces (1953)
    In:  CASI
    Details
    Publication Date: 2019-07-11
    Description: Experimental measurements of the attenuation of plane shock waves moving over rough walls have been made in a shock tube. Measurements of the boundary-layer characteristics, including thickness and velocity distribution behind the shock, have also been made with the aid of new cal techniques which provide direct information on the local boundary-layer conditions at the rough walls. Measurements of shock speed and shock pressure ratio are presented for both smooth-wall and rough-wall flow over lengths of machined-smooth and rough strips which lined all four walls of the shock tube. A simplified theory based on Von Karman's expression for skin-friction coefficient for flow over rough walls, along with a wave-model concept and extensions to include time effects, is presented. In this theory, the shock-tube flow is assumed to be one-dimensional at all times and the wave-model concept is used to relate the local layer growth to decreases in shock strength. This concept assumes that local boundary-layer growths act as local mass-flow sinks, which give rise to expansion waves which, in turn, overtake the shock and lower its mass flow accordingly.
    Keywords: Aerodynamics
    Type: NACA-RM-SL53D13A
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  • 11
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    Factors Affecting Laminar Boundary Layer Measurements in a Supersonic Stream (1953)
    In:  CASI
    Details
    Publication Date: 2019-08-13
    Description: The observed discrepancy at supersonic speeds between theoretical and apparent experimental average flat plate friction-drag coefficients calculated from boundary layer total-pressure surveys was investigated. Effects of the total-pressure probe, heat transfer through the leading edge region, change in leading-edge radius and strength of the leading-edge wave, possible early transition to turbulent flow or bursts of turbulence, and the slight stream-wise pressure gradient inherent in flat plate flow were investigated for plates with very sharp leading edges. Only one of these factors, the effect of the total-pressure probe, was found to be significant. Total-pressure probes of different tip heights, when placed in laminar boundary layers developing under identical conditions, were found to yield different values of friction drag coefficient. Extrapolation of these measurements indicates that a probe of vanishing size would yield the theoretical predicted values of average flat plate friction-drag coefficients. A correlation describing the relation between the friction-drag discrepancy and the probe tip height is presented.
    Keywords: Aerodynamics
    Type: NACA-TN-2891
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  • 12
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    A Transonic Wind-Tunnel Investigation of the Trim and Dynamic Response Characteristics of the Horizontal Tail of a 1/7-Scale Model of the Complete Tail of the Grumman XF10F-1 Airplane (1953)
    In:  CASI
    Details
    Publication Date: 2019-07-11
    Description: An investigation was made of the trim and dynamic response characteristics of the free-floating horizontal tail of a 1/7-scale model of the complete tail of the Grumman XF10F-1 airplane in the Langley 8-foot transonic tunnel at Mach numbers up to 1.13. The complete tail was mounted in the tunnel on a 3deg conical support body. Various configurations were investigated. A loss in damping of the horizontal tail at transonic speeds was shown by both tunnel and flight tests. The loss in damping extended over a greater Mach number range and the maximum loss occurred at a higher Mach number in the tunnel tests. Large-amplitude oscillations of the horizontal tail of the basic configuration which occurred at low supersonic Mach numbers appeared to be primarily due to the vertical tail of the basic configuration and the interference effects associated with this tail. Secondary factors contributing to the development of the large-amplitude oscillations of the horizontal tail of the basic configuration were probably the loss in damping of the horizontal tail at transonic speeds and the turbulence of the airstream itself.
    Keywords: Aerodynamics
    Type: NACA-RM-SL53D28
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  • 13
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    Theory of Wing-Body Drag at Supersonic Speeds (1953)
    In:  CASI
    Details
    Publication Date: 2019-07-11
    Description: At subsonic speeds the pressure drag arising from the thickness of the body or wings is negligible so long as the shapes are sufficiently well streamlined to avoid flow separation. In that range there exists no possibility of either favorable or adverse interference on the pressure distributions themselves. If one body is so placed as to receive a drag from the pressure field of another then the second body is sure to receive a corresponding increment of thrust from the first. At supersonic speeds this tolerance, which was permitted the designer, disappears and the drag becomes sensitive to the shape and arrangement of the bodies.To be sure, the primary factor here is the thickness ratio, but nevertheless there exist arrangements in which a large cancellation of drag occurs.
    Keywords: Aerodynamics
    Type: NACA-RM-A53H18a
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  • 14
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    Calibration of the Friez Aerovane, Wind Measuring Set An/GMQ-11 (1953)
    In:  CASI
    Details
    Publication Date: 2019-07-11
    Description: Calibrations of the Friez Aerovane, Wind Measuring Set AN/GMQ-11, manufactured by the Friez Instrument Division of the Bendix Aviation Corporation, were made in the Langley 300 MPH 7- by 10-foot tunnel at the request of the Signal Corps, U, S. Army. Two propellers snd two generators were tested through a speed range of 15 to 190 knots, The results indicated that at airspeeds greater than 80 knots the instrument indicated airspeeds higher than the tunnel airspeed..
    Keywords: Aerodynamics
    Type: NACA-RM-SL53L23B
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  • 15
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    Recent Results Pertaining to the Application of the "Area Rule" (1953)
    In:  CASI
    Details
    Publication Date: 2019-07-11
    Description: This paper is concerned primarily with the application of the "area rule" to the interpretation and improvement of the drag-rise characteristics of wing-body combinations at transonic and moderate supersonic speeds. Consideration of the general physical nature of the flow at transonic speeds, together with comparisons of the flow fields and drag-rise characteristics for wing-body combinations and bodies of revolution has led to the conclusion that near the speed of sound the drag rise for a thin low-aspect-ratio wing-body combination is primarily dependent on the axial distribution of cross-sectional area normal to the airstream (ref. 1). (The drag rise, sometimes referred to as pressure drag, is the difference between the drag level near the speed of sound and the drag level at subsonic speeds where the drag is due primarily to skin friction.) In order to illustrate the concept, figure 1 shows a wing-body combination and a body of revolution. A typical cross section normal to the airstream for the wing-body combination is shown at AA. The cross-sectional area of the wing is wrapped around the body of revolution so that the body has the same cross-sectional area at BB. All the other cross-sectional areas of the body of revolution are the same as those for the wing-body combination at the same axial stations. On the basis of the conclusion just stated, the drag rise for this body of revolution should be similar to that for the wing-body combination.
    Keywords: Aerodynamics
    Type: NACA-RM-L53I15a
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  • 16
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    Investigation of a Half-Conical Scoop Inlet Mounted at Five Alternate Circumferential Locations around a Circular Fuselage Pressure-Recovery Results at a Mach Number 2.01 (1953)
    In:  CASI
    Details
    Publication Date: 2019-07-11
    Description: The effects of inlet circumferential position around the fuselage on the characteristics of a half-conical scoop inlet having a 24.6deg half-angle cone have been investigated in the langley 4- by 4-foot supersonic pressure tunnel. Pressure-recovery results have been obtained at a Mach number of 2.01 for a fixed boundary-layer-bleed height which was 60 percent of the boundary-layer thickness at an angle of attack of 0deg, and for cowling position parameters of 42.4deg and 38.0deg. inlet had a capture area equal to 24.9 percent of the basic-fuselage frontal area. The angle of attack was varied from 0deg to 12deg. The most favorable pressure-recovery characteristics at angles of attack were obtained with the Inlet located on the bottom of the fuselage where the maximum recovery increased from a value of 81 percent at an angle of attack of 0deg to 87 percent at 12deg. In general, the pressure recovery decreased with increasing angle of attack for all other inlet locations. At a given angle of attack the pressure recovery decreased as the inlet location was progressively moved from the bottom to the top of the fuselage. Stable subcritical operation of the inlet with nearly constant pressure recovery was obtained for inlet mass-flow ratios from 1.0 to about 0.76 at an angle of attack of 0deg with the central body in the design position.
    Keywords: Aerodynamics
    Type: NACA-RM-L53D30B
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  • 17
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    Drag Measurements on Equivalent Bodies of Revolution of Six Configurations of the Convair MX-1964 (Originally MX-1626) Proposed Supersonic Bomber (1953)
    In:  CASI
    Details
    Publication Date: 2019-07-10
    Description: Tests on equivalent bodies of revolution of six configurations of the Consolidated Vultee Aircraft Corporation proposed supersonic bomber (Convair MX-1964) have indicated that it is possible to reduce the drag of the configuration by designing it to have a favorable area distribution. The method of NACA RM L53I22c to predict the peak pressure drag of a configuration on the basis of its area distribution gave generally good agreement with the subject models.
    Keywords: Aerodynamics
    Type: NACA-RM-SL53K04 , L-82024
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  • 18
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    High-Speed Wind-Tunnel Tests of a 1/16-Scale Model of the D-558 Research Airplane Lift and Drag Characteristics of the D-558-1 and Various Wing and Tail Configurations (1953)
    In:  CASI
    Details
    Publication Date: 2019-07-11
    Description: Tests were made in the Langley 8-foot high-speed tunnel to investigate the aerodynamic characteristics of the D-558-1 airplane and various wing and tail configurations on the D-558-1 fuselage. The various wing and tail configurations were tested to determine the aerodynamic effects of aspect ratio and sweep for suitable use on the second phase of the D-558 project (D-558-2). The tests were conducted through a speed range from a Mach number of 0.40 to approximately 0.94.This part of the investigation includes the lift and drag results available for the configurations tested at this rate. The D-558-1 results indicated that the lift force break would occur at a Mach number of 0.85 with some reduction in lift at speeds above this Mach number. Tests indicated that the airplane will have satisfactory lift and drag characteristics up to and including its design Mach number of 0.85. The 35deg sweptback, 35deg swept-forward, and low-aspect-ratio (2.0) wing configurations all showed pronounced improvements in maintaining lift throughout the Mach number range tested and in increasing the critical speeds above the D-558-1 value &itical to critical Mach numbers on the order of 0.9. Insofar as lift and drag characteristics are concerned level flight at speeds approaching the velocity of sound appears practical if swept or low-aspect-ratio configurations similar to those tested are used.
    Keywords: Aerodynamics
    Type: NACA-RM-L6J09
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  • 19
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    Low-Speed Longitudinal Stability Characteristics of a 1/6-Scale Model of the Republic XF-84H Airplane with the Propeller Operating (1953)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: A low-speed investigation was made of a 1/6-scale model of the Republic XF-84H airplane. The model had a single tractor propeller and a 40deg swept wing of aspect ratio 3.45. This investigation was undertaken to provide information on the effects of propeller operation on longitudinal stability characteristics for the XF -84H airplane and to provide an indication of slipstream effects that might be encountered on similar swept-wing configurations. Effects of propeller operation were generally destabilizing for all conditions investigated; however, the over-all stability characteristics with power on were greatly dependent on the power-off characteristics. With flaps and slats retracted, longitudinal instability was present at moderate angles of attack both with the propeller off and with power on. The longitudinal stability with flaps and slats deflected, which was satisfactory without power, was decreased by propeller operation, but no marked pitch-up tendency was indicated. Significant improvement in the power-on stability with flaps retracted was achieved by use of either a wing fence at 75 percent semispan, a leading-edge chord-extension from 65 to 94 percent semispan, or a raised horizontal tail located 65 percent semispan above the thrust line.
    Keywords: Aerodynamics
    Type: NACA-RM-SL-53F26
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  • 20
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    Drag and Longitudinal Trim at Low Lift of the North American YF-100A Airplane at Mach Numbers from 0.76 to 1.77 as Determined from the Flight Test of a 0.11-Scale Rocket Model (1953)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: Drag and longitudinal trim at low lift of the North American YF-100A airplane at Mach numbers from 0.76 to 1.77 as determined from the flight test of a 0.11-scale rocket model are presented herein. Also included are some longitudinal stability and some qualitative pitch-damping data. The subsonic external-drag-coefficient level was about 0.012, and the supersonic level was about 0.043. The drag rise occurred at a Mach number of 0.95. The longitudinal trim change at low lift consisted basically of a mild nose-up tendency at a Mach number of 0.90. An indication of wing flutter was present at Mach numbers from 0.95 to 1.11. However, the full-scale airplane wing has approximately twice the scaled first-bending frequency as the model tested and, hence, will probably be free of this type of flutter. The aerodynamic-center location was 71 percent behind the leading edge of the mean aerodynamic chord at a Mach number of 1.03 and 62 percent at a Mach number of 1.74. Qualitative measurement of damping in pitch indicates that at low lift coefficients damping will be low at a Mach number of 1.03.
    Keywords: Aerodynamics
    Type: NACA-RM-SL53E11a
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  • 21
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    Summary of Rocket-Model Tests at Zero Lift of the Northrop MX-775B Missile Configuration from Mach Numbers of 0.9 to 1.8 (1953)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: Flight tests were conducted between Mach numbers of 0.9 and 1.8 over a Reynolds number range of 9(exp 6) to 30(exp 6) to determine the zero-lift drag and some rolling-effectiveness characteristics of the Northrop MX -775B missile with small and large body. The MX-775B is a proposed long range, supersonic, ground-to-ground missile having an arrow wing with 67.5 degree leading-edge sweep, 15 deg trailing-edge sweep, and a modified NACA 0004 airfoil section. The configuration has no horizontal tail but has wing trailing-edge elevons which serve a dual purpose as elevators and ailerons. The ratio of body frontal area to wing plan-form area is 0.0127 for the small-body configuration and 0.0330 for the large-body configuration. Five 1/4-scale models were flown permitting determination of the drag coefficient for the basic small-body configuration, the incremental drag due to the large body, the incremental drag resulting from a blunt wing trailing edge, the wing-plus-interference drag, and some rolling-effectiveness data. Results indicated that the MX-775B has low supersonic zero-lift drag, the maximum zero-lift drag coefficients being respectively 0.0125 and 0.0155 at a Mach number of M = 1803 for the small- and large-body configurations. The effect of a blunt wing trailing edge, obtained by cutting off 10 percent of the wing chord, was to increase the zero-lift drag by 13 to 21 percent. Wing-plus-interference drag accounted for 78 percent of the total drag at M = 0.9 and 70 percent at M = 195 for the small-body configuration. The ailerons produced positive rolling effectiveness for the wing stiffness of the test models and the dynamic pressures of the test.
    Keywords: Aerodynamics
    Type: NACA-RM-SL53J02
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  • 22
    Electronic Resource
    Electronic Resource
    Über Steroide. 112. Mitteilung. Über die Herstellung des Δ8,14-1,7-Dioxo-8,11-dimethyl-dodecahydro-phenanthrens. Totalsynthetische Versuche in der Steroidreihe I (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 376-385 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Herstellung zweier isomerer Δ8,14-1,7-Dioxo-8, 11-dimethyl-dodecahydro-phenanthrene (Xa und Xb) wird beschrieben. Für das in grösserer Menge anfallende Isomere Xa werden Methoden zur selektiven Reduktion und Ketalisierung der Carbonylgruppe am Kohlen-stoffatom 1 angegeben.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19530360207
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  • 23
    Electronic Resource
    Electronic Resource
    La phosphorylation du glucose par l'acide métaphosphorique (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 466-470 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: La phosphorylation du glucose par l'acide métaphosphorique fournit à cǒté d'un ou plusieurs anhydrides du glucose (lévoglucosane?) une petite quantité d'un ester polyphosphorique qui n'est toutefois pas le glucose-6-triphosphate attendu. Une hydrolyse acide du mélange permet d'isoler cependant le glucose-6-phosphate pur soit sous forme de sel de baryum soit sous forme d'ester libre. Les rendements oscillent entre 10 et 15% de la quantité de glucose mise en œuvre, mais la synthèse se révèle particulièrement courte et simple.
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    Über den Einfluss des Methylenblaus auf die Atmung der Lebermitochondrien (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 519-526 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1. The influence of several basic dyes on the oxygen consumption of liver mitochondria in the presence of succinate and pyruvate has been studied. The oxidation of succinate is strongly inhibited by dye concentrations above 10-4 m.
    Additional Material: 3 Ill.
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    Über Formazylkomplexe. II. Über die Kuppelungsprodukte von diazotierten o-Aminophenolen und Benzoyl-essig-o-carbonsäure (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 531-536 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es wird gezeigt, dass die grüne, beständige Chromkomplexe bildenden Kuppelungsprodukte aus diazotierten o-Aminophenolen und Benzoyl-essig-o-carbonsäure nicht wie bisher angenommen o,o'-Dioxyazokörper sind, sondern Formazylstruktur besitzen.
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    URL: http://dx.doi.org/10.1002/hlca.19530360222
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    Ein Beitrag zum Studium des Reaktionsmechanismus der biologischen Transaminierung (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 549-554 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: α,α′-Imino-glutaric-succ,inic acid is not decomposed by a highly purified preparation of glutamic-oxalacetic transaminase; „α,α'-iminoacid dehydrases“ must be different from transaminases.
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    Neue Synthese der D-Chinovose (D-Glucomethylose) (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 570-572 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Aus 1,2-Monoaceton-3,5-benzyliden-D-glucose wurde der p-Toluolsulfonsäureester hergestellt und mittels LiAlH, zu 1,2-Monoaceton-3,5-benzyliden-D-chinovose reduziert; daneben entstand etwas3,5-Benzyliden-D-chinovose. Diese beiden Chinovose-Derivate wurden verseift und die D-Chinovose kristallisiert isoliert.
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    Synthese von basisch substituierten Chromonen (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 620-626 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es wird gezeigt, dass man durch Kondensation von basisch substituierten Estern mit o-Oxy-acylphenonen und Ringschluss der entstandenen 1,3-Diketone zu Chromonen gelangt, die in 2-Stellung basisch substituiert sind. Die Synthese liess sich auch mit N-acetylierten Estern durchführen.
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    Zur Kenntnis der Claisen-Umlagerung II. (Versuche mit 14C, 3. Mitteilung) (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 489-500 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Bei Studien der para-Claisen-Umlagerung mit Hilfe von 14C-markiertem Allyl-[2,6-dimethyl-phenyl]-äther liess sich durch Kreuzexperimente und durch Abbau des Allyläthers und seines Umlagerungsproduktes zeigen, dass die para-Umlagerung streng intramolekular und ohne Inversion des Allylrestes verläuft.
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    URL: http://dx.doi.org/10.1002/hlca.19530360218
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    Über eine einfache Synthese von Flavyliumfarbsalzen (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 526-530 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es werden einige neue Flavyliumfarbsalze dargestellt, einmal durch Kondensation von Flavon mit Dimethylanilin, Diaryläthylenen und Dimethylaminozimtsäure, sodann einfacher aus Flavyliumperchlorat und den gleichen Komponenten. In letzterem Falle ist die Kondensation von einer selbsttätigen Dehydrierung begleitet.
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    Recherches sur la formation et les transformations des esters. III. De l'action catalysatrice de l'ion calcium sur l'hydrolyse alcaline des esters et anhydrides phosphoriques. Sur la formation du phosphate quaternaire de calcium (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 537-547 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The calcium ion is acting as a very active catalyst in the alcaline hydrolysis of pyrophosphoric acid, poly- and metaphosphoric acids, of ethylphosphate, ethyl pyrophosphate (splitting of the P—O—P bond) as well as in the alcoholysis of the latter. We suggest that there may be a relation between this phenomenon and the fact that tricalcium phosphate is able to fix still one equivalent of calcium ion, giving tetrabasic calcium phosphate (PO4Ca2)OH. If this view is justified, the catalytic activity of calcium ion is a confirmation of the mechanism we have admitted for the hydrolysis of phosphoric esters (and anhydride functions).
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    Odorosid D und Odorosid F. Die Glykoside von Nerium Odorum Sol. 5. Mitteilung. Glykoside und Aglykone, 108. Mitteilung (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 554-562 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Bereitung von reinem Odorosid D (I) über sein Tetracetat (11)wird beschrieben. Das neue Präparat zeigte an der Katze eine erheblich stärkere Wirksamkeit als frühera angegeben.
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    Zur Struktur der aus Tribrom-muconsäure-γ-lacton durch Hydrolyse gebildeten Verbindungen (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 573-576 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Fur zwei aus α, β δ-Tribrom-muconsäure-γ-lacton durch Hydrolyse gebildete Oxy-dibrom-muconsäure-γ-lactone konnten die in einer früheren Untersuchung aufgestellten vorläufigen Konstitutionsformeln durch weitere Abbaureaktionen bestätigt werden.
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    Neue Synthese des Dihydro-desoxycodeins (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 605-607 
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    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Dihydro-codein wurde in den p-Toluolsulfonsäureester und letzterer durch Reduktion mit Lithiumaluminiumhydrid in Dihydrodesoxycodein übergeführt.
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    Kalorimetrische Untersuchungen an einfachen organischen Ringverbindungen. I. Herstellung und Eichung von spannungsfreien Platin-Widerstandthermometern für kalorimetrische Zwecke (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 627-637 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The experiences in the making and calibration of small platinum resistance thermometers for precise calorimetric measurements are reported. Ice, steam, oxygen, and carbondioxyde point of 4 platinumresistance thermometers are measured and the constants of these thermometers calculated.
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    Über Steroide. 116. Mitteilung. Abbau der Gallensäuren-Seitenkette XIII. Eine vereinfachte Darstellung von Δ20,22;23-21-Brom-choladienen (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 891-895 
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    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: By treating a Δ23-24, 24-diphenyl-cholene with 2 moles of N-bromo-succinimide in allylbromide the corresponding Δ20,22;23-21-bromo-24, 24-diphenyl-choladiene is obtained directly in a 70% yield. Thus three of the usual reactions in the side chain degradation of bile acids to adrenal cortical hormones are concentrated into one, experimentally very simple step. Some conversions connected with this reaction are described.
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    Sur le dosage complexométrique du calcium en présence de magnésium et de phosphate (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 782-787 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: (1) Using a simple anion exchange technique for the elimination of phosphate, the complexometric titration method of Schwarzenbach has been applied to the determination of calcium in phosphate rock. Interfering iron can easily be removed by precipitation as ferric phosphate.
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    Recherches sur la biosynthèse des caroténoïdes chez un bacille paratuberculeux. V. Influence de la température sur la composition du mélange pigmentaire (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 937-941 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Temperature induces quantitative changes in the pigmentation of Mycobacterium phlei grown 6 days on glycerol broth.
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    Das Trennrohr. X. Zur Theorie der quantitativen Trennung von Gasgemischen (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 949-961 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1. Die Beurteilung des Verhaltens polynärer Mischungen im Trennrohr führt zur Diskussion des Vorschlags einer einfachen Methode, binäre und polynäre Gemische quantitativ zu zerlegen. Diese besteht darin, Hilfsgase mit bestimmten Eigenschaften zusätzlich zu verwenden.
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    Isolierung von Lycorin aus den Zwiebeln einer Crinum-Art (Crinum firmifolium Baker?) aus Madagaskar (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 824-828 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Aus den Zwiebeln einer Crinum-Art aus Madagaskar, wahrscheinlich Crinum firmifolium Baker, wurde ein krist. Alkaloid isoliert und als Lycorin identifiziert. Die neben den Basen erhaltenen geringen Mengen neutraler Anteile zeigten bis zu Konzentrationen von 10-4 g/cm3 am Froschherz keine deutliche digitalisähnliche Wirkung.
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    Photodichroismus an festen Lösungen von p-Nitrosodimethylanilin in Polystyrol (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 1025-1058 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es wird der Dichroismus untersucht, welcher an festen Lösungen von p-Nitrosodimethylanilin in Polystyrol durch Bestrahlung mit linear polarisiertem Lichte hervorgebracht wird. Dieser Dichroismus beruht im Gegensatz zu dem von F. Weigert erstmals gefundenen Ausbleichungsdichroismus auf der Erzeugung von in festem Polystyrol orientierten, farbigen Umsetzungsprodukten.
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    Komplexone XXIV. Die Vanadiumkomplexe der äthylendiamin-tetraessigsäure (= H4Y) (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 1089-1101 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The apparent equilibria constants of the following reactions have been determined in aqueous KCl of ionic strength 0,1 at 20° C: .
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    Über die Silbersalz-Brom-Decarboxylierung. I. Die „Säure-Austausch-Reaktion“ der Acylhypobromite (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 1115-1121 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The silver salt-bromine decarboxylation has been studied in the presence of free carboxylic acid.
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    Metallkomplexe und tuberkulostatische Aktivität. Metallionen und biologische Wirkung, 14. Mitteilung (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 941-949 
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    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es wird die tuberkulostatische Aktivität einer Reihe von Komplexbildnern in Gegenwart von Cu¨ bzw. von Co¨ ermittelt. Für die zum Teil zu beobachtende verstärkende Wirkung von Cu¨ bzw. Co¨ werden theoretische Vorstellungen entwickelt.
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    3-Epi-digitoxigenin. Glykoside und Aglykone. 111. Mitteilung (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 985-989 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Reduktion von Digitoxigenon (IV) mit NaBH4 liefert 3-Epidigitoxigenin (V) in 75-proz. Ausbeute. V wurde durch das Acetat VI und das Formiat VII charakterisiert. VI und VII werden durch 1-proz. methanolische HCl bei 20° vollständig hydrolisiert, während Digitoxigenin-acetat (II) dabei unverändert bleibt. 3-Epi-digitoxigenin (V) zeigte an der Katze keine digitalisartige Wirkung.
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    Über Steroide. 118. Mitteilung. Ein neues Verfahren zur Herstellung von Steroiden mit 11β-Hydroxylgruppe. I. Versuche an Verbindungen der Spirostanreihe (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 1241-1251 
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    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A simple five-step conversion of 12-ketosteroids into 11 β-hydroxy compounds (and also 11-ketones) through 11 β, 12 β-epoxides is described. The process can be accomplished with high yields, as it is shown in the present paper dealing with the application to hecogenin acetate.
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    Zur Kenntnis der Kupplungsreaktion. V: Die Reaktionsfähigkeit des undissoziierten Phenols. Kupplungen in hochkonzentrierten Schwefelsäuren (Vorläufige Mitteilung) (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 1070-1073 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: This is a preliminary communication on azo couplings in sulphuric acid solution of high concentration. The reaction of the undissociated naphthol which is not measurable in aqueous solution of low acidity (because of the predominant naphtholate coupling) can be demonstrated in sulphuric acid solution of 73-81% H2SO4.
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    Zur Tetranitromethan-Probe (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 1121-1124 
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    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es wurde gezeigt, dass sich durch eine spektrophotometrische Auswertung der Tetranitromethan-Probe Hinweise auf die Zahl von Alkylsubstituenten an isolierten Doppelbindungen gewinnen lassen.
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    Die Glykoside der Samen von Strophanthus wightianus Wall. Glykoside und Aglykone, 115. Mitteilung (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 1282-1295 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Aus den Samen von Strophanthus wightianus Wall. aus Travancore (Südindien) wurden nach Einwirkung des wasserlöslichen Teils der in denselben enthaltenen Fermente 2 krist. Glykoside isoliert und als Divaricosid und Caudosid identifiziert. Daneben wurde eine merkliche Menge eines amorphen Konzentrats erhalten, das ähnliche Eigenschaften zeigte wie das amorphe Konzentrat von „Substanz D“ aus S. divaricatus. Ferner wurde in kleiner Menge ein Kristallisat erhalten, das als „Kristallisat E“ bezeichnet wird, sowie in Spuren ein „Kristallisat F“ vom Smp. ca. 300°, das möglicherweise mit „Nebenprodukt A“ aus S. courmontii identisch ist.
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    Zur Konstitution von Demecolcin (Substanz F) aus Colchicum autumnale L. Substanzen der Herbstzeitlose und ihre Derivate 35. Mitteilung (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 1319-1324 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Als neue Bezeichnung für die Substanz F aus Herbstzeitlosen wird der Trivialname Demecolcin vorgeschlagen.
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    URL: http://dx.doi.org/10.1002/hlca.19530360613
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    Die Kalischmelze des Alkaloids Ibogain (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 1337-1344 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Aus den Produkten der Kalischmelze des Ibogains wurden zwei Indolbasen B (C20H26ON2) und C (C20H26ON2) und eine Neutralsubstanz C12H15ON isoliert, die sich durch Vergleich mit einem synthetischen Produkt als das bisher noch unbekannte 1, 2-Dimethyl-3-äthyl-5-oxy-indol erwies.
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    URL: http://dx.doi.org/10.1002/hlca.19530360617
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    Über die relativen Unterschiede im H218O-Gehalt natürlicher Wässer (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 1352-1369 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die relativen Unterschiede im 18O/16O-Verhältnis von 91 Wässern natürlicher Herkunft gegenüber Basler Leitungswasser (als Standard) werden massenspektrometrisch gemessen und in 0/00 des 18O/16O-Verhältnisses im Standardwasser angegeben. Für die Isotopenanalyse wird ein einfaches Verfahren, das zu exakten Resultaten führt, beschrieben. Die Untersuchung umfasst 12 Niederschlags- und 9 Oberflächenwässer, ferner 54 unterirdische Wässer (mit 51 schweizerischen Mineral- und Thermalwässern) und 16 durch Dehydratisierung von Mineralien gewonnene Wässer. Die Ergebnisse werden unter Einbezug entsprechender, früher durchgeführter Isotopenanalysen diskutiert.
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    Recherches sur la formation et les transformations des esters. V. Sur la réactivité de l'anhydride phosphorique (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 1189-1199 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The reaction of phosphoric anhydride with H3PO4, Et3PO4 and alcohols proceeds by stages, the P-O-P- functions becoming less reactive with the diminution of the number of -O-P groups fixed on each P. These reactions are considered to proceed by primary addition of a proton on to the hemipolar oxygen of a PO4 group; at any rate the reactions of phosphoric anhydride with esters and alcohols are slowed down by additon of tertiary bases.
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    Die Konstitution von Evomonosid. Glykoside und Aglykone, 117. Mitteilung (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 1309-1314 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Evomonosid (I) aus den Samen von Evonymus europaea L. gibt bei der Spaltung mit HCl in Aceton als Hauptprodukt Digitoxigenin (III). I ist demnach Digitoxigenin-L-rhamnosid, wobei den molekularen Drehungswerten entsprechend α-glykosidische Verknüpfung vorliegt. Der Versuch, I aus III und Acetobrom-L-rhamnose nach Königs und Knorr zu bereiten, lieferte nur krist. Δ14-Anhydro-digitoxigenin-α-L-rhamnosid-〈1,5〉 (V), das durch ein krist. Triacetat VI charakterisiert wurde. Evomonosid-triacetat (II) gab mit POCl3 in Pyridin nicht das erwartete VI, sondern krist. β-Anhydrodigitoxigenin (IV).
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    Über Steroide und Sexualhormone. 191. Mitteilung. Die Konfiguration der 4-Oxy-cholestane (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 1332-1337 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es wurde die Konfiguration der beiden 4-Oxy-cholestane eindeutig bestimmt. In diesem Zusammenhang wurden weitere Beispiele geliefert für den regelmässigen sterischen Verlauf von Reaktionen an Steroid-epoxyden.
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    URL: http://dx.doi.org/10.1002/hlca.19530360616
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    Weiteres über die Sumpfschachtelhalmbasen (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 1387-1400 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Konstitution des Palustrins, des Hauptalkaloids aus Equisetum palustre, wurde weiter untersucht und in dem Alkaloid nachgewiesen: eine Kohlenstoffdoppelbindung (wahrscheinlich tri-substituiert), eine sekundäre Lactamgruppe, eine sekundäre Aminogruppe, eine tertiäre Aminogruppe und ein einfach C-substituierter Piperidinring. Wahrscheinlich enthält das Alkaloid auch eine tertiäre OH-Gruppe. Verschiedene Abbauprodukte der Verbindung entsprechen solchen, die auch aus Lupinan-Alkaloiden erhalten worden sind.
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    Über die Glykoside von Bowiea volubilis Harvey. 3. Mitteilung. Glykoside und Aglykone, 119. Mitteilung (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 1417-1423 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Aldehydgruppe C - 19 in Bovosidol A wurde mit NaBH4 zum Alkohol reduziert. Die neue Verbindung, Bovosidol A genannt, wurde als Acetat zum 3β, 19-Diacetoxy-allo-ätiansäure-methylester abgebaut. Bovosid A hat somit die Konstitutionsformel I, in der nur die Stellung und Konfiguration der tertiären Hydroxylgruppe nicht streng bewiesen ist, sondern in Analogie zu anderen herzaktiven Glykosiden und Aglykonen als 14β-ständig formuliert wurde.
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    Contribution à la chimiothérapie de la tuberculose I. Influence exercée sur l'activité des hydrazides par l'introduction de groupements lipophiles ou hydrophiles et par une extension du système conjugué (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 1423-1432 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Following a new conception with the aim of finding new antitubercular compounds, some hydrazides and hydrazones of the cinchoninic acid series substituted in position 2 have been prepared.
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    Über Sublimationstrennungen von Cäsiumchlorid aus Gemischen mit Kalium- und Rubidiumchlorid (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 1445-1454 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es werden vergleichende Versuche über die Sublimations-geschwindigkeit von CsCl, RbCl und KCl beschrieben. Die Abtrennung von CsCl aus äquimolaren Gemischen der Salze durch Sublimation im Vakuum wird untersucht.
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    Über die vierte isomere Dihydro-lysergsäure und eine neuartige Epimerisierungsreaktion. 32. Mitteilung über Mutterkornalkaloide (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 1512-1526 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Durch teilweise Epimerisierung am C-Atom 8 entstand bei der alkalischen Verseifung des DL-Dihydro-nor-isolysergsäure(II)-hydrazids eine neue isomere Dihydro-nor-lysergsäure, die Dihydro-nor-lysergsäure(II). Auf gleiche Weise bildete sich aus D-Dihydro-iso-lysergsäure(II)-hydrazid die bisher unbekannte D-Dihydro-lysergsäure(II), die als Hydrazid charakterisiert wurde.
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    Die Konstitution des Scilliglaucosidins. 34. Mitteilung über Herzglykoside (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 1531-1557 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Auf Grund von Abbauversuchen und von Vergleichen, hauptsächlich mit Scillarenin, konnte für das Scilliglaucosidin, das durch Abspaltung von Glucose aus Scilliglaucosid entsteht, die Formel I abgeleitet werden. Dieses Genin unterscheidet sich demnach vom Scillarenin nur durch die Anwesenheit einer Aldehydgruppe an C 10, welche die Stelle einer Methylgruppe einnimmt. Wie das Scillarenin besitzt auch das Scilliglaucosidin eine Doppelbindung zwischen den C-Atomen 4 und 5. Die mit dieser Stellung der Doppelbindung zusammenhängenden charakteristischen Reaktionen des Scillarenins, nämlich die besonders leichte Eliminierbarkeit der Hydroxylgruppe an C 3 und die positive Rosenheim'sche Farbreaktion, fallen beim Scilliglaucosidin anders aus. Dieser Unterschied ist auf die Anwesenheit der sauerstoffhaltigen Gruppe an C 10 zurückzuführen. In der folgenden 35. Mitteilung beschreiben wir eine Modellsubstanz aus Strophanthidin, die ein analoges Verhalten zeigt. Auch der unterschiedliche Ausfall der Rosenheim'schen Farbreaktion gegenüber Δ4-Steroiden, die an C 10 eine Methylgruppe tragen, steht, wie in der nachfolgenden 36. Mitteilung gezeigt werden wird, im Einklang mit Formel I für Scilliglaucosidin.
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    Die Infrarotspektren von Kettenmolekeln der Formel R′CO(CH2CH2)nCOR″. II. Die Normalschwingungen des Symmetrietypus Bu (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 1791-1803 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Für die Durchführung einer Normalkoordinatenanalyse der Bu-Normalschwingungen von Kettenmolekeln des Typus X(CH2CH2)nX mit der Symmetriegruppe C2h und hohen Werten von n (n ≧ 5) wurde ein spezielles mathematisches Verfahren entwickelt. Dasselbe besteht in der Approximation der Matrizen mittels Frobenius-scher Matrizen oder Zirkulanten. Dadurch wird ein einfacher Weg zur Berechnung der Eigenfrequenzen eröffnet, indem diese als Wurzeln von Gleichungen niedrigen Grades (≦ 4) gefunden werden können. Das Verfahren gestattet auch die Wechselwirkungsterme der Matrizen , herrührend von den CH2-bending-, CH2-wagging-, C—C-stretching- und C—C—C-bending-Schwingungen zu berücksichtigen und dadurch die Normalfrequenzen erheblich zuverlässiger zu berechnen.
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    Über den Wasserstoffdruck von Calciumhydrid (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 1820-1832 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es wurden die Gleichgewichtsdrucke des Wasserstoffs bei der Hydrierung von reinem Calcium im Temperaturbereich von 711-941° bestimmt, unter Verfolgung der Abhängigkeit der Drucke von der Zusammensetzung des Bodenkörpers. Die gemessenen Drucke zeigten weitgehende Übereinstimmung mit den Befunden von Johnson und Mitarbeitern.
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    Viskosität und Strömungsdoppelbrechung mässig konzentrierter Lösungen hochmolekularer Stoffe (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 1575-1596 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die mässig konzentrierten Lösungen von linearen Makromolekeln zeigen eine sehr starke Abhängigkeit der Viskosität und der Doppel-brechung von der Konzentration und dem Gefälle, die durch die vorliegenden Theorien der unendlich verdünnten Lösungen nicht wiedergegeben werden kann. Die Strukturviskosität ergibt am Anfange ein lineares Absinken der Viskosität mit dem Gefälle, was ein ausgesprochener Konzentrationseffekt ist. Die sehr unübersichtlichen Verhältnisse bei der Strömungsdoppelbrechung können als Orientierungseffekte der Einzelmolekel gedeutet werden, falls man als effektive Scherspannung das Produkt aus dem Gefälle und der wirksamen Viskosität η* einführt. Die Werte der letzteren müssen aus den entsprechenden Viskositätsmessungen entnommen werden. Genau genommen liefern diese Messungen das Produkt [η] η*, welches allein die für das Verhalten der gelösten Makromolekel charakteristische Funktion der Konzentration und des Gefälles darstellt. Mit dieser Vorstellung erhält man eine befriedigende Wiedergabe der Messungen für Lösungen, deren relative Viskosität bis zu 2500 geht. Ferner hat man auf diese Weise die Möglichkeit, aus bequem auszuführenden Messungen bei mässigen Konzentrationen die charakteristischen Konstanten der gelösten Einzelmolekel, die spezifische Maxwell'sche Konstante und die Orientierungszahl, zu bestimmen. Allerdings hat man dabei auch die Viskositäten für die gleichen Gradienten zu messen.
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    Veilchenriechstoffe. 53. Mitteilung. Über die Umsetzung von Dihydro-α-jonolen mit N-Brom-succinimid (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 1640-1648 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Dihydro-α-jonol-acetate (I) geben bei der Umsetzung mit N-Brom-succinimid und nachfolgender Behandlung des Bromierungsproduktes mit Silberacetat ein Gemisch von Acetoxy-dihydro-jonol-acetaten, aus dem sich durch Verseifung und Chromatographie zwei ungesättigte Diole C13H24O2 isolieren lassen. Eines davon liefert bei der Oxydation mit Chrom(VI)-oxyd in Eisessig das 4-Oxo-dihydro-β-jonon (VII). Durch die partielle Hydrierung der letzteren Verbindung entsteht das 4-Oxo-tetrahydro-jonon (VIII), welches auch durch vollständige Hydrierung des ungesättigten Diols und nachfolgende Oxydation erhalten werden kann. Das 4-Oxo-tetrahydro-jonon wird durch Einwirkung von Säuren bzw. Aluminiumoxyd zu bicyclischen Oxy-ketonen isomerisiert.
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    Contribution à l'étude du système quinaire Ca++—NH4+—H+—NO3-—PO4---—H2O. VIII. La polytherme de la saturation simultanée en phosphate monocalcique, phosphate monoammonique et phosphate double de calcium et d'ammonium (sel double DI) (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 1971-1980 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1° Dans le système quinaire Ca++—NH4+—H+—NO3- —PO4---—H2O, nous avons établi, pour les températures de 0°, 25° et 50°, la composition de solutions simultanément saturées de phosphate monocalcique, de phosphate monoammonique et de sel double Ca9(NH4)4H32(PO4)18, 10H2O.
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    Contribution à l'étude du système quinaire Ca++—NH4+—H+NO3-—PO4---—H2O. IX. Les solutions simultanément saturées à 25° de phosphate monocalcique et de phosphate monoammonique (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 1980-1983 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1° Dans un système quinaire, les solutions simultanément saturées, à une température donnée, de deux phases solides distinctes sont représentées par deux diagrammes tridimensionnels. En projetant des lignes de niveau de ces deux diagrammes sur un même plan, on obtient un diagramme de solubilité qui permet d'établir par interpolation la composition de toute solution saturée de ces deux phases solides, si 2 coordonnées de la solution sont données.
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    Zur Kenntnis der elektrolytischen Abscheidung von Metallpulvern. Über die Theorie der Entladung von komplexen Ionen (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 2023-2027 
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    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Theorie der Entladung von komplexen Ionen bei der elektrolytischen Abscheidung von Metallpulvern wird kurz diskutiert an Hand der quantitativen Verknüpfung des Beginns der Pulverbildung mit den Transportvorgängen an der Kathode.
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    Ergebnisse der Tieftemperaturforschung. XII. Anreicherung der leichten Argonisotope durch Rektifikation (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 2045-2055 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Natürliches Argon enthält 0,337% 36A. Es wird das Dampfdruckverhältnis der Isotope 36A und 40A bei 83,8°K zu 1,006 berechnet und eine Rektifikationsanlage beschrieben, die mit etwa 130 theoretischen Böden für 36A einen totalen Trennfaktor von 1,94 besitzt und täglich 15 l Argon mit ∼ 0,6% 36A zu liefern vermag.
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    Masthead (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953) 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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    URL: http://dx.doi.org/10.1002/hlca.19530360101
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    Über Kupferkomplexe von Säureamiden und anderen Verbindungen. Metallionen und biologische Wirkung, 12. Mitteilung (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 10-13 
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    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The complex formation with Cu¨ of a series of compounds, part of them acting in a tautomeric form, is studied.
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    Metallkomplexe mit Polyaminen IX. Die Interpretation der Stabilitätskonstanten der Silberkomplexe (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 23-36 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: It is shown that the stability constants of the silver complexes with various diamines, triamines and tetramines can be predicted in most cases quantitatively with the simple assumption of the existence of two opposite coordination points on the silver cation only, using the well known relation between KAgA, KAg2A and KHA, the formation constants of the silver and proton complexes with simple monoamines. Out of a number of 29 complex ions, comprising the dimeric form of Ag(en), the stability of 24 could be calculated correctly. In two cases, where the amino group adding the silver is strongly influenced by a nearby ionic charge on the molecule, the calculated values were too large. For three other complexes, containing all more than two amino groups per Ag, the theoretically calculated values were somewhat too small, indicating in these cases the coordination of more than two basic nitrogen atoms by the silver cation.
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    La cholestérolestérase du tissu adipeux. Sa sensibilité aux actions hormonales (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 90-101 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Nos recherches permettent de démontrer la présence dans le tissu adipeux d'un enzyme favorisant in vitro l'hydrolyse des esters du cholestérol. Son action est étudiée en fonction du pH, de la concentration en enzyme, du temps et de la nature du substrat. Le tissu adipeux des rats traités par une dose appropriée d'extrait antéhypophysaire favorise non pas une hydrolyse des esters du cholestérol, mais une estérification du cholestérol. In vitro l'action des hormones antéhypophysaires est analogue. Ajoutée au milieu expérimental, l'insuline supprime l'action de l'extrait antéhypophysaire.
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    Ein weiterer Beitrag zur Konstitutionsaufklärung des Corynantheins (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 127-130 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Eine früher durch Abbau von Dihydro-corynanthein erhaltene Verbindung wurde durch Synthese als 3-Äthyl-4-isopropyl-pyridin aufgeklärt. Damit sind alle C-Atome des Corynantheins bzw. Dihydro-corynantheins in Abbauprodukten gefasst und ihre gegenseitige Stellung aufgeklärt worden.
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    Über zwei Isomere des α-Cevins. 5. Mitteilung über Veratrum-Alkaloide (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 189-197 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Aus der Alkaminfraktion, die nach der schonenden alkalischen Hydrolyse von Cevadin bzw. Veratridin erhalten wird, liess sich ausser dem Cevagenin ein neues, instabiles, kristallisiertes Alkamin, das γ-Cevin gewinnen, das sich im kristallisierten Zustand allmählich in ein drittes bisher ebenfalls unbekanntes Isomeres, in δ-Cevin umlagert. Alle drei isomeren Alkamine geben beim Erwärmen mit alkoholischer Kalilauge das schon bekannte α-Cevin.
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    Die Lage der Doppelbindung im Ring E des Alstonins (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 215-226 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Auf Grund von UV.- und IR.-Spektren konnte gezeigt werden, dass im Ring E des Alstonins und des Py-Tetrahydro-alstonins die Gruppierung ROOC—C=C—O—vorliegt.
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    Über Synthesen des Glutardialdehyds. 2. Mitteilung über Alkaloidsynthesen (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 268-274 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Ausgehend von dem leicht zugänglichen und billigen Dicyclopentadien und von Cyclopentanon haben wir über cis- und trans-Cyclopentendiol-(1,2) und ihre Hydrierungsprodukte, cis- und trans-Cyclopentandiol-(1,2), in relativ guter Ausbeute und auf einfache Weise durch Glykolspaltung mit Natriumwismutat Glutardialdehyd hergestellt.
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    Die biologische Oxydation von Fettsäuren mit Dreifachbindung (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 296-299 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: By feeding of stearolic acid, stearol-alcohol, behenolic acid and hendecynoic acid to dogs we were able to prove the formation of azelaic acid and, therefore, the splitting of the triple bond.
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    Untersuchungen über asymmetrische Synthesen II. Über den sterischen Verlauf der Umsetzung von Phenylglyoxylsäure-estern des Menthols, Neomenthols, Borneols und Isoborneols mit Methylmagnesiumjodid (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 320-325 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Phenylglyoxylsäure-ester des (-)-Menthols, (+)-Neomenthols, (+)-Borneols und (-)-Isoborneols wurden mit Methylmagnesiumjodid umgesetzt, und das optische Drehungsvermögen der nach der Verseifung des Reaktionsproduktes erhaltenen Atrolactinsäure wurde bestimmt. In Übereinstimmung mit den in vorangehender Mitteilung1) entwickelten Anschauungen wurde gefunden, dass der Drehungssinn der so erhaltenen Atrolactinsäure von der Konfiguration desjenigen asymmetrischen Kohlenstoffatoms der Alkoholkomponente abhängig ist, welches die Hydroxyl-Gruppe trägt.
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    Zur Kenntnis der Triterpene. 177. Mitteilung. Zur Gliederzahl des Ringes C der pentacyclischen Triterpene (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 335-336 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19530360143
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    Addenda et Errata (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 343-343 
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    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19530360146
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    Über die Herkunft der Calebassen-Curare-Alkaloide. Untersuchung verschiedener Calebassen. 9. Mitteilung über Calebassen-Alkaloide (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 345-349 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es wird gezeigt, dass in der Rinde von Strychnos Mitscherlichii die Calebassen-Curare-Alkaloide: C-Fluorocurinin, C-Fluorocurarin, C-Curarin, C-Calebassin, C-Alkaloid I und C-Alkaloide der B-, C-, D-Gruppe vorkommen, und zwar in ungefähr denselben Mengenverhältnissen wie in vielen Calebassen. Die Eingeborenen müssen daher bei der Bereitung des Calebassen-Curare von dieser Rinde Gebrauch machen.
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    Sur l'existence de celluloses ramifiées. Viscométrie comparative de solutions de celluloses et d'amidons (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 385-397 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: (1) Les courbes viscométriques: (ln ηr)/c en fonction de c ont été établies pour les celluloses: végétale, bactérienne et animale, et comparées à celles de l'amylose, de l'amylopectine et du glycogène, ainsi qu'à celles de leurs esters.
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    Recherches sur l'action chimique des décharges électriques XXXVII. Contribution à l'étude de la décharge sous forme d'effluve; effet produit par le régime des harmoniques du courant alternatif et par le type d'effluveur utilisé (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 409-414 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: En se fondant sur les oscillogrammes, sur les résultats des mesures calorimétriques et sur le tracé des courbes caractéristiques I = f(E), on a pu apprécier l'influence exercée par le changement de dimensions ou de type d'effluveur utilisé. On a comparé les effets produits par deux régimes de marche de l'effluveur, caractérisés, sur les oscillogrammes de la courbe i = f(t), l'un par des franges longues, l'autre par des franges courtes.
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    Coenzym A. Modellversuche zur biologischen Acylierungsreaktion. Über die Reaktionsfähigkeit von Thiolcarbonsäuren und ihren Estern (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 414-424 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The reaction between amines and thiolcarboxylic acids and their esters in dilute aqueous solution serves as a model for the biological acylation with coenzyme A. Constitutional influences and the influence of pH on the yields of acid amides are discussed in terms of a hypothesis concerning the mechanism of the reaction.
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    Über Farbreaktionen von α-Ionon und 5-Oxo-α-ionon mit Alkali (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 463-466 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: α-Ionon und 5-Oxo-α-ionon geben bei Zusatz von Alkalilauge zur alkoholischen Lösung rote, nicht sehr beständige Farbreaktionen, die auf der Bildung von Alkalisalzen dieser beiden Verbindungen beruhen. Die Absorptionsspektra der beiden roten Salze zeigen ein Absorptionsmaximum bei 510 mm̈. Da β-Ionon keine ähnliche Farbreaktion aufweist, kann diese zur annähernden Bestimmung kleiner Mengen α-Ionon in β-Ionon dienen.
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    Erratum (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 548-548 
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    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19530360224
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    Masthead (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953) 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19530360301
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    Carotinoidsynthesen XI. Weitere, mit 1, 18-Diphenyl-3, 7, 12, 16-tetramethyl-octadecanonaen verwandte Polyene (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 562-569 
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    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Aus 1,18 -Diphenyl-3,7,12,16-tetramethyl-octadeca-diin- (5,13)-heptaen-(1,3,7,9,11,15,17) (I) sowie aus 1,18-Diphenyl-3,7,12,16-tetramethyl-octadeca-in- ( 5 ) -nonaen- (1,3,7,9,11,13,14,15,17) (II)konnten durch partielle Reduktion zwei kristallisierte, sehr ähnliche Pigmente isoliert werden, Von denen das eine das 1,18-Diphenyl-3,7,12,16 - tetramethyl- octadeca-2in-(5)-octaen-(1,3,7,9,11,13,15,17)(IIIa), das andere das 1, 18-Diphenyl-3,7,12,16,-tetramethyl-octa-deca-decaen-(1,3,4,5,7,9,11,13,15,17) (III) zu sein scheint. Die beiαden Pigmente III a und III lieferten bei der partiellen Reduktion mit Wasserstoff und Palladium das 5,6-Mono-cis-l, 18-diphenyl-tetra-methyl-octadeca-nonaen (IV), welches unter der Wirkung von Jod zum ganz-trans-l,18-Diphenyl-3,7,12,16-tetramethyl-octadecanonaen isomerisiert wird.
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    Sur la constitution de l'acide chondroïtine-sulfurique (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 597-605 
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    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Reprenant l'etude de la constitution de l'acide chondroïtine-sulfurique, nous avons pu établir: 1° Que la liaison chondrosaminique se trouve bien en C1-C4, conformément aux conclusions de Wolfrom.2° Que la liaison glucuronique se trouve en C1-C6 et non pas C1-C3.3° Que le groupe sulfate est situé en C3 ou C4 de la chondrosamine.
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    Metallkomplexe mit Polyaminen X: Mit Tetrakis-(β-aminoäthyl)-äthylendiamin =„penten„ (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 581-597 
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    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: N, N, N', N'-Tetrakis-(, 5-aminoethyl)-ethylendiamine7 abbreviated with „penten“, which contains 6 basic nitrogen atoms, forms metal complexes of a very high stability. The stability constants of Mn(penten)+2, Fe(penten) +2, Co( penten)+ 2, Ni( penten)+ 2, Cu( penten)+2, Zn( penten)+2, Cd(penten)+2 and Hg(penten)+2 have been determined. In the complexes of Mn, Fe, Co, Ni and Cd „penten“ functions doubtless as a hexa-dentate group. In spite of this fact, the complexes of these metals add protons rather easily, forming hydrogen complexes MHpenten+3. This is probably due to some strain within the 5 condensed chelate rings. Protons are still more easily added by the complexes of Cu, Zn and Hg, where the hexamine „penten“ functions probably as a tetradentate or a pentadentate group only. Cu(penten)+2 and Hg(penten)+2 can even add two protons each, forming CuH+2penten+4 and HgH+2penten+4. Some evidence is given for the existence of CuH3penten+5, CoH3,-penten+5, NiH2 penten+4, CdH3penten+5 and HgH3penten+5.
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    Zur Frage der Konstitution des Allo-DL-3-phenylserins (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 660-664 
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    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es wurden die chemischen und strukturellen Eigenschaften des Allo-DL-phenylserins sowie seine Umwandlung in die entsprechende trans-Reihe näher untersucht und beschrieben.
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    Methode zur Bestimmung der Elektronenformel organischer Verbindungen II (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 691-701 
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    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die in dem ersten Teil dieser Arbeit im Rahmen der Heitler-Rumer-Verfahren abgeleitete Beziehung zur Berechnung der Elektronenverteilung für Systeme, bestehend aus einvalentigen Atomen, wurde hier auf Systeme von mehrvalentigen Atomen erweitert.
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    Über synthetisches „Squalen“. Einige Ausführungen zu der Bemerkung von P. Karrer (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 717-718 
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    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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    URL: http://dx.doi.org/10.1002/hlca.19530360325
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    Masthead (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953) 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19530360401
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    Makroskopische Modelle statistisch geknäuelter Fadenmolekeln. Verbesserung bisheriger Ansätze über Viskosität und Strömungsdoppelbrechung von Lösungen hochmolekularer Stoffe (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 731-752 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Während bei Gesamtheiten von Fadenmolekeln für die Beschreibung der praktischen Eigenschaften, sowie für die Diskussion verschiedener Mittelwerte der einzelne Molekelfaden durch ein aus Nm geradlinigen, statistisch aneinandergefügten Fadenelementen der Länge Am bestehendes Modell beschrieben werden kann (Knickmodell), sind in vorangehenden Arbeiten bei der Durchführung von Modellversuchen über das hydrodynamische Verhalten von Fadenmolekeln an Stelle von Knickmodellen etwas anders geartete Modelle, die als Segmentmodelle bezeichnet werden können, verwendet worden. Solche, aus Draht bestehende Segmentmodelle werden dadurch erhalten, dass man einen Draht der Länge L = Nσ Bσ in Nσ Abschnitte je der Länge Bσ einteilt und jedem dieser Abschnitte in statistischer Weise durch Krümmen des Drahtes die Gestalt eines Kreissegments erteilt, genauer gesagt so, dass die Richtung der Tangente im Anfangspunkte des Segmentes zur Richtung der Tangente im Endpunkt eines herausgegriffenen Segmentes statistisch orientiert ist. Die Herstellungsweise dieser aus Kreissegmenten bestehenden Modelle wird beschrieben und näher begründet. Bei der näheren Diskussion und beim Vergleich der Parameter, welche diese Segmentmodelle einerseits, die Knickmodelle andererseits charakterisieren, ergeben sich gewisse Korrekturen an Ansätzen, dic in vorangehenden Arbeiten benützt worden waren. Diese Korrekturen wirken sich auf die Werte der von uns bisher verwendeten Beziehungen über Diffusion, Sedimentation, Viskosität und Strömungsdoppelbrechung aus. Die Ausdrücke, die sich nach Anbringen der angedeuteten Korrekturen in den Zahlenfaktoren dieser Beziehungen ergeben, werden zusammengestellt. Es zeigt sich, dass auf Grund der korrigierten Beziehungen über Diffusion, Sedimentation und Viskosität eine bessere übereinstimmung von Theorie und Experiment festzustellen ist als auf Grund der bisher verwendeten Ausdrücke. Insbesondere zeigt sich, dass gewisse bisher aufgetretene Diskrepanzen zwischen den aus Diffusion und Sedimentation einerseits, aus Viskosität anderseits ermittelten Werten der Länge Am des statistischen Vorzugselementes nach Anbringen dieser Korrekturen verschwinden.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19530360328
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    Fractionnement chromatographique de l'amidon. Recherches sur l'amidon 54 (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 811-819 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1. Synthetically prepared mixtures of tapioca amylose and amylopectin, as well as natural starches of maize, potatoe and tapioca were studied by means of chromatographic fractionation on alumina columns in aqueous medium.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19530360408
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  • 98
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    Neue Synthese der D-Xylomethylose (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 837-838 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es wird eine vereinfachte Herstellung der D-Xylomethylose beschrieben, die darin besteht, dass aus 1,2-Aceton-D-xylose der 3,5-Ditosylester hergestellt und dieser mittels LiAlH4 reduziert wird.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19530360413
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  • 99
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    Carotinoidsynthesen XII. Bis-dehydro-lycopine und totalsynthetische cis-Lycopine (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 828-834 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Aus dem Tetraol I, 2,6,10,14,19,23,27,31-Octamethyl-dotriaconta-heptaen-(2,6,8,16,24,26,30)- diin-(12,20)-tetraol-(10,14,19,23), wurden durch Wasserabspaltung 3 ungesättigte Kohlenwasserstoffe, die Bis-dehydro-lycopine a, b und c erhalten, für welche die Formeln IIa, IIb und IIc in Frage kommen. Zwei dieser Verbindungen wurden durch partielle Reduktion in cis-Lycopine (b, c, c′) übergeführt, welche, mindestens teilweise, cis-Konfiguration an sog. „verbotenen“ Doppelbindungen besitzen. Alle dargestellten ungesättigten Kohlenwasserstoffe dieser Reihe erwiesen sich als relativ unbeständig.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19530360411
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  • 100
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    Über die Landolt-Reaktion VIII. Theoretische Betrachtungen zu den Befunden der vorangehenden Arbeit (1953)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 868-875 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Mit Hilfe eines geeigneten Ansatzes auf Grund kinetischer Vorstellungen gelingt es, eine allgemeine Gleichung abzuleiten, die die Abhängigkeit des oxydierten Anteils z der reduzierenden Komponente von der Zeit für 10 Beispiele der Landolt-Reaktion vom Typ III bis zum Eintritt des Farbumschlages befriedigend genau darstellt. Diese allgemeine Form der Gleichung braucht bisher nur in einem Beispiel zur Anwendung zu kommen, da sie sich für die übrigen ver-einfachen lässt, wobei sich in Übereinstimmung mit den Experimenten ergibt, dass drei Gruppen von Substanzen voneinander zu unterscheiden sind: eine Gruppe, bei der die Reaktionsgeschwindigkeit ständig wächst, eine zweite, bei der sie fortlaufend abnimmt, und eine dritte, bei der sie konstant ist. Die genannte allgemeine Gleichung (7) entspricht einer Reaktion, deren Geschwindigkeit zuerst wächst, dann einen Höchstwert erreicht, um schliesslich wieder abzunehmen.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19530360417
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