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  • Inorganic Chemistry  (21)
  • ASTRONOMY
  • 1995-1999
  • 1970-1974  (21)
  • 1955-1959
  • 1925-1929
  • 1971  (21)
  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 2622-2628 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reactions of Cyclobutenediones, XX. Synthesis and Reactivity of p-substituted PhenylcyclobutenedionesAddition of chlorotrifluoroethylene (2) to (p-nitrophenyl)acetylene (1a) and (p-methoxyphenyl)acetylene (1b) affords the cyclobutenes 3a and 3b, respectively. On treatment with sulfuric acid the cyclobutenediones 4a, b were obtained and examined with regard to their reactivity.
    Notes: Die Addition von Trifluorchloräthylen (2) an [p-Nitro-phenyl]-acetylen (1a) bzw. [p-Methoxy-phenyl]-acetylen (1b) liefert die Cyclobutene 3a, b, die beim Behandeln mit Schwefelsäure in die entsprechenden Cyclobutendione 4a, b übergehen. 4a, b werden hinsichtlich ihrer Reaktivität untersucht.
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 4-10 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the Structure of Thioamides and their Derivatives, XI. N.M.R-Spectroscopic Studies and the Mechanism of Isomerization of Thioamide anionsIn the n. m. r. spectra of thioformamide anions 2 a larger trans long-range coupling constant is observed than in the spectra of the corresponding thioformamides 1. In spite of this spectral evidence indicating that 2 has the stronger partial double bond character, 2 isomerizes faster than 1. This suggests that isomerization proceeds via an inversion mechanism, an assumption which is verified by the steric effects of o-substituents in thioformanilide anions 4. On the other hand, in the case of thioformanilides 3 a rotation mechanism is observed.
    Notes: In den NMR-Spektren von Thioformamid-Anionen 2 wird eine größere trans-Fernkopplungskonstante als in den entsprechenden Thioformamiden 1 gefunden. Trotz des daraus zu folgernden größeren Doppelbindungscharakters wird bei 2 eine schnellere Isomerisierung als bei 1 beobachtet. Der dadurch nahegelegte Inversionsmechanismus wird durch den sterischen Einfluß von o-Substituenten in den Thioformanilid-Anionen 4 belegt, während für die Thioformanilide 3 ein Rotationsmechanismus gefunden wird.
    Additional Material: 3 Tab.
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 220-227 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: cis- and trans-3.3′-Dimethoxy-5.5′-di-tert-butyldiphenoquinone-(4.4′)The two geometric isomers of 3.3′-dimethoxy-5.5′-di-tert-butyldiphenoquinone-(4.4′) (1) were isolated. The configurational assignment was made on the basis of n.m.r. spectra and the X-ray diffraction pattern from single crystals. The free enthalpy of activation for the cis/trans-isomerisation was determined. -p-Diphenoquinones with different substituents in both rings, which were needed as model compounds, could be prepared for the first time.
    Notes: Die beiden geometrischen Isomeren des 3.3′-Dimethoxy-5.5′-di-tert.-butyl-diphenochinons-(4.4′) (1) wurden isoliert. Die Konfigurationszuordnung gelang anhand der NMR-Spektren sowie von Einkristall-Röntgenaufnahmen. Die Freie Aktivierungsenthalpie der cis/trans-Isomerisierung wurde bestimmt. -p-Diphenochinone mit verschiedenen Substituenten in beiden Ringen, als Vergleichssubstanzen benötigt, konnten erstmals dargestellt werden.
    Additional Material: 2 Ill.
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 519-523 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: E.S.R. Investigation of the Dinaphtho[2.3-c:2′.3′-h]phenothiazinyl Radical8H-Dinaphtho[2.3-c : 2′.3′-h]phenothiazine (1), obtained by reaction of di-2-anthrylamine with sulfur, yields the stable free radical 4 by dehydrogenation. For the solid state a free radical content of 85% has been determined by e. s. r. Solutions of 4 gave a complex e. s. r. spectrum which is discussed in connection with Hückel calculations.
    Notes: Das aus 2.2′-Dianthrylamin durch Umsetzung mit Schwefel zugängliche 8H-Dinaphtho-[2.3-c: 2′.3′-h]phenothiazin (1) liefert bei der Dehydrierung das stabile freie Radikal 4. Der Radikalgehalt beträgt im Kristall nach ESR-Messungen 85%. Lösungen von 4 liefern ein linienreiches ESR-Spektrum, das im Zusammenhang mit Hückel-Rechnungen diskutiert wird.
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 653-660 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Preparation of Fluorocyclotriphosphazenes with Phosphazene Side ChainsFluorocyclotriphosphazenes with phosphazene side chains were prolonged by the alternating reactions of hexamethyldisilazane and phosphorus pentachloride (1-8). The compounds formed contain up to six alternating (PN) bonds. Reactions of heptamethyldisilazane and methylamine give 9 and 10. Substitution reactions with the higher ring compounds yield 11-14. The properties of these substances are described and their structures could be likely prooved on the basis of 31P and 19F n. m. r. investigations. The compounds are further characterized by analysis and i. r. spectra.
    Notes: Fluorcyclotriphosphazene mit Phosphazenseitenkette werden durch alternierende Reaktionen mit Hexamethyldisilazan und Phosphorpentachlorid verlängert (1-8). Dabei entstehen Verbindungen, die bis zu sechs alternierende (PN)-Bindungen enthalten (7, 8). Umsetzungen mit Heptamethyldisilazan und Methylamin ergeben 9 und 10. Substitutionen an höheren Ringverbindungen führen zu 11-14. Die Eigenschaften dieser Substanzen werden beschrieben und ihre Struktur durch 31P- und 19F-NMR-Untersuchungen wahrscheinlich gemacht. Die Verbindungen werden weiterhin durch Analysen und IR-Spektren charakterisiert.
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 969-971 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 3204-3210 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Rearrangement Reactions at the P=N Double BondCompounds XSO2N=PCl3 (X = F or Cl) react in the molar ratio of 1:1 with alcohols to give the alkyl ester dichlorides XSO2N=PCl2OR (1 - 6). In the presence of catalytic amounts of diethyl ether these compounds rearrange to N-alkylphosphoryl dichlorides XSO2N(R) P(O)Cl2 (1a - 6a). The mechanism of this rearrangement was studied. On the basis of n.m.r. and mass spectra the above mentioned structures have been assigned. 1a and 2a react with (CH3)3SiN(CH3)2 to form (CH3)3SiCl and the compounds FSO2N(CH3) - P(O)ClN(CH3)2 (7) and FSO2N(C2H5) - P(O)ClN(CH3)2 (8), resp. I.r. data and analyses are reported.
    Notes: Verbindungen XSO2N=PCl3 (X = F oder Cl) reagieren im Molverhältnis 1:1 mit Alkoholen zu den Alkylester-dichloriden XSO2N=PCl2OR (1-6). In Gegenwart katalytischer Mengen Diäthyläther lagern diese Verbindungen zu den N-Alkyl-phosphoryldichloriden XSO2N-(R) - P(O)Cl2 (1a-6a) um. Der Mechanismus dieser Umlagerung wurde untersucht. Die angegebenen Strukturen werden aufgrund von NMR- und Massenspektren wahrscheinlich gemacht. 1a und 2a reagieren mit (CH3)3SiN(CH3)2 unter (CH3)3SiCl-Abspaltung zu FSO2N(CH3) - P(O)ClN(CH3)2 (7) bzw. FSO2N(C2H5)-P(O)ClN(CH3)2 (8). IR-Daten und Analysen werden mitgeteilt.
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 1660-1673 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Crystal and Molecular Structure Analysis of the Insectmoulting Hormone 20-Hydroxyecdysone (Ecdysterone)The complete structure of natural 20-hydroxy-ecdysone has been determined by a three-dimensional X-ray analysis using the convolution molecule method.
    Notes: Die vollständige Struktur des Insektenhäutungshormons 20-Hydroxyecdyson wird durch eine Röntgenstrukturanalyse der natürlichen Verbindung ermittelt.
    Additional Material: 3 Ill.
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 1674-1686 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Crystal and Molecular Structure Analysis of β-(p-Brombenzoyloxy)-α-methyl-N.N-diethyl-cinnamamideIn the crystal-structure analysis of the title compound the main interest is concerned with the steric hinderance of those parts of the molecule which possess conjugated bonds.
    Notes: In der Kristallstrukturanalyse der Titelverbindung steht die sterische Hinderung der konjugiert verbundenen Molekülteile im Vordergrund des Interesses.
    Additional Material: 4 Ill.
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 3341-3349 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 3-(Ethoxycarbonyl)cinchoninamides from Isatins and Ethyl 3-AminoacrylatesSubstituted isatins react with ethyl 3-aminoacrylates affording the 3-(ethoxycarbonyl)cinchoninamides by ring enlargement.
    Notes: Substituierte Isatine reagieren mit 3-Amino-acrylsäure-äthylestern unter Ringerweiterung zu 3-Äthoxycarbonyl-cinchoninsäureamiden.
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