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  • Inorganic Chemistry  (83,671)
  • Organic Chemistry  (68,964)
  • GEOPHYSICS  (21,936)
  • LUNAR AND PLANETARY EXPLORATION  (14,409)
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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 100 (1967), S. 1289-1295 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Ein neues Verfahren zur Synthese von Aminalen und Enaminen durch Umsetzung von Tris(dimethylamino)-arsin mit Aldehyden oder Ketonen wird beschrieben. Diese Reaktion ist auch auf andere Tris(dialkylamino)-arsine übertragbar.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 102 (1969), S. 2959-2965 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Das in seiner Struktur als 11-Hydroxy-1.2-methylendioxy-aporphin (16) aufgeklärte2) Alkaloid Pukatein wurde synthetisiert. Aus dem Amin 9 und 2-Nitro-3-benzyloxy-phenyl-essigsäure (8) (Weg A) bzw. 2-Nitro-3-benzyloxy-ω-diazo-acetophenon (7) (Weg B) wurde das Amid 10 hergestellt. Isochinolinringschluß nach Bischler-Napieralski und Pschorr-Ringschluß führten zum (±)-11-Benzyloxy-1.2-methylendioxy-aporphin (15), dessen Hydrogenolyse 16 ergab.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 100 (1967), S. 1137-1143 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Bei der Kondensation von Zimtsäure-äthylester und N-Acetyl-glycin-äthylester-natrium entsteht stereoselektiv trans-3-Phenyl-2-carboxy-pyrrolidon-(5) (2a1), während sich durch thermische Decarboxylierung von 3-Phenyl-2.2-dicarboxy-pyrrolidon-(5) (8) die reine cis-Form bildet.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 699 (1966), S. 98-106 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Vom Chinolin ausgehend werden Chinolin-carbaldehyd-(3) und einige seiner Substitutionsprodukte synthetisiert. Die Aldehyde dienen zur Darstellung pharmazeutisch interessanter Chinolinderivate.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 728 (1969), S. 144-151 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Absolute Configuration of I+)- and {-)-2-Amino-tetralin and of the four Isomeric 2-Amino-tetralols- ( I )Maintaining its configuration, L-(+)-aspartic acid is converted to (-)-(2S)-2-amino-tetralin, and its absolute configuration thus determined. The hydrogenolysis of three of the four isomeric 2-amino-tetralols-(1) 7a, 7b, and 7c with Pd led to the optically pure (+)- and (-)-2-amino-tetralins (6a and 6b), which allows one to make a definite statement regarding the steric structure of the levo- and dextrorotatory cis- and trans-2-amino-tetralols-(1). It could be shown that, contrary to previous assumptions, based on CD-spectra, (+)-(1S, 2R)-2-amino-tetralol-(1) (7c) does not have the same absolute configuration as L-(-)-ephedrine, with the absolute configuration (1R, 2S). Therefore for arylaminoethanols, it is not possible to correlate the open-chained and cyclic compounds to one another by means of the CD-spectraalone.
    Notes: 1.-(+)-Asparaginsäure wird unter Erhaltung ihrer Konfiguration in (-)-(2S)-2-Amino-tetralin umgewandelt und damit dessen absolute Konfiguration festgelegt. Durch Hydrogenolyse von drei der vier isomeren 2-Amino-tetralole-(1) 7a, 7b, 7c mit Palladium werden (+)- und (-)-2-Amino-tetralin (6a und 6b) optisch rein erhalten, was Rückschlüsse auf die räumliche Struktur der links- und rechtsdrehenden cis- und trans-2-Amino-tetralole-(1) zuläßt. Es zeigt sich, daß entgegen früheren Annahmen, denen circulardichroitische Messungen zu Grunde lagen, (+)-(1S, 2R)-2-Amino-tetralol-(1) (7c) nicht dieselbe absolute Konfiguration besitzt wie L-(-)-Ephedrin mit der absoluten Konfiguration (1R, 2S). Es ist daher bei Arylaminoäthanolen nicht möglich, ohne weiteres durch CD-Spektren offenkettige und cyclische Verbindungen einander zuzuordnen.
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  • 6
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 324 (1982), S. 964-972 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Investigations on the Thermal Decomposition of n-Dodecylcyclopentane in the Gas PhaseIn the thermal decomposition of n-dodecylcyclopentane at 670 and 750°C in a laboratory tubular reactor mixtures of hydrogen and 57 and 113 hydrocarbons respectively are formed. The mixtures have been analyzed and identified by capillary gas chromatography and by mass spectrometry. The distribution of the reaction products is used for mechanistic discussions.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 329 (1987), S. 824-832 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Thermal Reaction of Mono-n-alkyl-benzenesThe pyrolysis of ethyl-(1), n-propyl-(2), n-hexyl-(3) and n-octylbenzene (4) has been studied under conditions of steam cracking (600 to 800°C) in a laboratory scale tubular reactor. The overall activation energies determined for (1) to (4) were found to be nearly identical (221 to 227 kJ · mol-1) obviously caused by similar initial steps. The main liquid product observed was styren accompanied by ω-phenyl-1-alkenes and α-olefins. Benzene is an important side product of 1. It might be formed mainly by a hydrogen assisted dealkylation via a cyclohexadienyl type radical as reactive intermediate.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 325 (1983), S. 66-74 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Kinetic Investigations of the Pyrolysis of Mono-n-alkyl-cyclohexanesThe thermal decomposition of cyclohexane and six mono-n-alkylcyclohexanes was studied kinetically in a metallic laboratory tubular reactor at 650 to 850°C and atmospheric pressure.Kinetic parameters were found to be a function of length of the alkylic side chain. A comparison with analogous parameters of n-paraffins and the unsubstituted cyclohexane allowed the conclusion that C—C-scission in the alkylic chain is the initial reaction in pyrolysis of n-alkylcyclohexanes followed by radical attacks to all C—H-bonds of the feed molecules.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 9
    Publication Date: 2019-07-12
    Description: Measurements of the altitude, latitude, angle, and energy distributions of 5-80-MeV neutrons at 29 deg S geomagnetic latitude and 8.5-GV cutoff, obtained with the University of California neutron double-scatter telescope on a flight from Alice Springs, Australia, on November 10, 1981, are reported. The data are presented in extensive tables and graphs and characterized in detail. The altitude distribution of upward-moving and downward moving neutrons is found to peak at 100 g/sq cm (as reported for 41 deg N geomagnetic latitude by Preszler et al., 1974), while the angular distributions exhibit dips at 60 and 130 deg and the energy distribution has a flat region at about 20 MeV. The escape current of 0.059 + or - 0.008 neutrons/sq cm sec is consistent with theoretical models for the injection of energetic protons into the earth radiation belt (Merker, 1972 and 1975).
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 93; 2499-251
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  • 10
    Publication Date: 2019-07-12
    Description: Theoretical calculations are presented that explain the balloon observations by O'Neill et al. (1987) of a strong north-south anisotropy of atmospheric gamma rays over the Southern Hemisphere, and to predict the north-south ratios. It is shown that the gamma rays that originate at the longest distances from the telescopes give the largest north-south ratios. Comparisons are made of the experimental north-south ratios measured on balloons launched from Alice Springs, Australia, and from Palestine, Texas, U.S., and predictions are made for ratios at other geomagnetic latitudes and longitudes. It is pointed out that observers who measure backgrounds for celestial sources may be misled unless they correct for the north-south effect.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 93; 14719-14
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