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  • 1
    Electronic Resource
    Electronic Resource
    Desaktivierungsverhalten von Arenen und Heteroarenen. XXXVI. Zum Lösungsmittel- und Temperatureinfluß auf das Desaktivierungsverhalten von 9, 9′-Bis(acridizinium-yl) bei hohen Konzentrationen (1983)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 325 (1983), S. 225-231 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Deactivation Behaviour of Arenes and Heteroarenes. XXXVI. The Solvent and Temperature Dependence of Deactivation Behaviour of 9, 9′-Bis(acridizinium-yl) at High ConcentrationAt room temperature the geometrical structure of the fluoresceing singlet state of 9, 9′-bis(acridizinium-yl) is determined by the solvent. In solvents of the type A (water, methanol, acetonitril) a plain S1-state emits, in the case of the solvent type B (ethanol, propanol-(2)) the S1-state is twisted. Both excited states have different emission spectroscopical properties.At high concentration (c ≥ 10-4 mol l-1) in the case of the solvent type B a new emission band is observed, and the monomer emission is quenched. This new band is interpreted as a fluorescence from a molecular associate in the excited state. The intensity of this associate band is increasing with decreasing temperature. It is shown that this band is the result of molecular association in the ground state. From the photochemical irradiation it follows that only in the case of the solvent type B a photocycloaddition is possible. The plain S1-state does not react.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19833250207
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  • 2
    Electronic Resource
    Electronic Resource
    Zur Polymerisation von Allylverbindungen. Reaktion von Allylbenzen mit 2,2′-Azo-bis-isobutyronitril (1983)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 34 (1983), S. 328-331 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: 2,2′-azo-bis-isobutyronitrile was completely thermally decomposed in allyl benzene. The reaction mixture obtained was separated by preparative gas and thin-layer chromatography. Using steam pressure measurements and the logarithmic dependence of gas chromatographic retention value of the molecular weight the molecular weight of the separated components was investigated. The structure was analysed by IR- and NMR-spectroscopy and 14C-labelled tracer substances. A mechanism of the reactions is discussed.
    Notes: 2,2′-Azo-bis-isobutyronitril wurde in Allylbenzen thermisch vollständig zersetzt. Das entstehende Reaktionsgemisch konnte mit Hilfe der präparativen Gas- und Dünnschichtchromatographie getrennt werden. Die Bestimmung der Molmassen der abgetrennten Komponenten erfolgte über Dampfdruckmessungen sowie über die logarithmische Abhängigkeit der gaschromatographischen Retentionswerte von den Molmassen. Die Konstitutions- und Konfigurationsaufklärung gelang mittels IR- und NMR-Spektroskopie sowie durch Anwendung von 14C-markierten Tracer-Substanzen. Ein möglicher Reaktionsablauf wird diskutiert.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1983.010340604
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  • 3
    Electronic Resource
    Electronic Resource
    Geographical variations in the carbon isotope composition of the diet and hair in contemporary man (1982)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 9 (1982), S. 390-394 
    Details
    ISSN: 0306-042X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Geographic variations in the carbon isotope composition of the human diet and human hair were investigated. The carbon isotopic composition of common foodstufls purchased in Chicago, USA, Tokyo, Japan and Munich, FRG, were determined by combustion and differential isotope ratio mass spectrometry. The dietary protein carbon for the United States (-18.1‰) was calculated to be enriched in 13C relative to the Japanese (-21.2‰) and the German (-23.6‰) diets. To a large degree, the differences reflected the consumption of corn-fed animal products in the United States and Japan, as well as seafood in Japan. The carbon isotopic composition of hair (-16.4, -18.0 and -20.4%) for the three respective populations correlated with the calculated values of the dietary protein, but were 2-3% enriched in 13C. Changes in the isotopic composition of beard hair were shown to record the changes in dietary composition in travelers visiting the respective regions.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200090906
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  • 4
    Electronic Resource
    Electronic Resource
    Polarographische Bestimmung der Zerfallsgeschwindigkeit von 2,2′-Azo-di(isobutyronitril) in Acrylnitril-Polymerisationslösungen (1981)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 32 (1981), S. 228-228 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1981.010320411
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  • 5
    Electronic Resource
    Electronic Resource
    Reaktionen von Difluordichlormethan mit Kohlenwasserstoffen (1980)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 322 (1980), S. 751-760 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Reactions of Difluoridichloromethane with HydrocarbonsThe reaction of difluordichloromethane with different hydrocarbons between 150°C and 250°C yields the CFCl2-substituted hydrocarbons. Beside it the corresponding chlorides are formed. For the hydrocarbons studied the following sequence of reactivity against difluordichloro-methane was found. n-paraffins 〈 isoparaffins ≅ cycloparaffins 〈 alkylaromatics 〈 olefines.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19803220509
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  • 6
    Electronic Resource
    Electronic Resource
    Oxidation of Alcohols with Benzyl(triethyl)ammonium Permanganate (1981)
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 20 (1981), S. 104-104 
    Details
    ISSN: 0570-0833
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/anie.198101041
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  • 7
    Electronic Resource
    Electronic Resource
    Oxidation of Amines with Benzyl(triethyl)ammonium PermanganateDedicated to Professor Wilhelm Klemm on the occasion of his 85th birthday (1981)
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 20 (1981), S. 109-109 
    Details
    ISSN: 0570-0833
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/anie.198101091
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  • 8
    Electronic Resource
    Electronic Resource
    Carbosilylierte Phospha-alkeneProfessor Rolf Appel zum 60. Geburtstage am 25. Februar 1981 gewidmet (1981)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 473 (1981), S. 85-90 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Carbosilylated phospha-alkenesLithium-tris-trimethylsilylmethanide, (Me3Si)3C-Li, reacts with various organodichlorophosphines to give tris-(trimethylsilyl)-methyl-organochlorophosphines, the termal treatment of which under elimination of trimethylchlorosilane results in formation of the title compounds of the general formula B.NMR-data as well as the synthesis of compounds A and B will be discussed.
    Notes: Lithium-tris-trimethylsilylmethanid, (Me3Si)3C-Li, reagiert mit verschieden substituierten Organyldichlorphosphinen zur Tris-Trimethylsilylmethyl-organylchlorphosphinen A, deren thermische Beanspruchung unter Abspaltung von Trimethylchlorsilan zu den Titelverbindungen der allgemeinen Formel B führt.Die NMR-spektroskopischen Daten der Verbindungen des Typs A und B sowie deren Synthese wer-den diskntiert.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19814730209
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  • 9
    Electronic Resource
    Electronic Resource
    2,4,6-Tris(tert.butyl)phenyl-substituierte Phosphine (1982)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 488 (1982), S. 75-79 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 2,4,6-Tris(tert.butyl)phenyl Substituted PhosphinesTris(tert.butyl)phenyl-lithium reacts with PCl3 to give 2,4,6-tris(tert.butyl)phenyldihalogenophosphine which is reduced by LiAlH4 yielding 2,4,6-tris(tert.butyl)phenylphosphine. The same reaction by using (CH3)3Si—CH2—PCl2 leads to 2,4,6-tris(tert.butyl)phenyl-trimethylsilylmethylhalogenophosphine. Thermal treatment of this compound results under elimination of HCl and (CH3)3SiCl in the formation of . The nmr data of the compounds synthesized are discussed.
    Notes: Tris(tert.butyl)phenyl-lithium reagiert mit PCl3 oder (CH3)3Si—CH2—PCl2 zum 2,4,6-Tris(tert.butyl)phenyl-dihalogenphosphin bzw. entsprechenden -trimethylsilylmethylhalogenphosphin. Während sich ersteres mit LiAlH4 in das 2,4,6-Tris(tert.butyl)phenylphosphin überführen läßt, liefert letzteres durch thermische Beanspruchung nach Abspalten von HCl bzw. (CH3)3SiCl die Phosphine mit zweifach koordiniertem Phosphor. Die 1H- sowie 31P-NMR-Daten der dargestellten Verbindungen werden diskutiert.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19824880109
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  • 10
    Electronic Resource
    Electronic Resource
    Alkali-Phosphorverbindungen und ihr reaktives Verhalten. 79. NMR-Untersuchungen an Alkali-organophosphiden. I (1982)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 495 (1982), S. 115-119 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Alkali Phosphorus Compounds and their Reactivity. 79. NMR Investigations of Alkali Organophosphides. IThe 31C and 31P NMR spectra display a further separation of ion-pairs of alkali-organophosphides in THF solution after addition of cryptandes . An exception presents LiP(Ph)2, T1—13C-NMR measurements suggest a tetrameric structure in THF.
    Notes: Anhand der 13C- und 31P-NMR-Daten läßt sich zeigen, daß sich die Ionenpaare der Alkali-organophosphide in THF durch Zugabe von Kryptanden entsprechend weiter trennen lassen. Eine Ausnahme bildet LiP(Ph)2, das aufgrund von T1—13C-NMR-Messungen eine tetramere Struktur in THF aufweist.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19824950111
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