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  • Biochemistry and Biotechnology  (2)
  • Inorganic Chemistry  (1)
  • Wiley-Blackwell  (3)
  • Wiley
  • 1985-1989  (3)
  • 1
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 29 (1987), S. 648-651 
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: β-D(+)-Glucose pentaacetate was hydrolyzed both chemically and enzymatically. In contrast to the alkaline hydrolysis, esterase-catalyzed deacetylations afforded significant accumulation of intermediate glucose esters at different degrees of substrate conversion. Aspergillus niger lipase, the most suitable of the four enzymes tested, was used for preparative hydrolysis of glucose pentaacetate. As a result, gram quantities of pure glucose-2,3,4,6-tetraacetate, glucose triacetate (a mixture of two positional isomers, 2,4,6- and 3,4,6-), and glucose-4,6-diacetate were prepared.
    Additional Material: 1 Ill.
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  • 2
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 31 (1988), S. 628-633 
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 7 Ill.
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  • 3
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Untersuchungen an Phosphazenen. 18. Aminolyse-Reaktionen der Pentachloro (2′,2′,2′-triphenylphosphazen-1′-yl) cyclotriphosphazen, N3P3Cl5(NPPh3)Die Reaktionen des Pentachloro(2′,2′,2′-triphenylphosphazen-1′-yl)-cyclotriphosphazens, N3P3Cl5(NPPh3) mit primären und sekundären Aminen wurden in Diethylether, Methylcyan und Benzen untersucht. Die Strukturen der erhaltenen Verbindungen, N3P3Cl5-nRn(NPPh3) (n = 1, R = NHMe, NHBut, NMe2, NC5H10, NEt2; n = 2, R = NMe2, NC5H10, NEt2; n = 3, R = NMe2, NHBut; n = 5, R = NMe2) wurden mittels 1H- und 31P-NMR-Spektroskopie geklärt. Der —NPPh3-Substituent übt einen bevorzugt geminal dirigierenden Einfluß auf den Einbau sekundärer Aminonukleophile aus; Verbindungen, die eine ≡ PCl(NPPh3)-Gruppe enthalten, werden in der zweiten und den folgenden Stufen des Cl-Ersatzes nicht gebildet. Reaktionen mit primären Aminen erfolgen nach dem bekannten Muster der analogen Reaktionen des Hexachlorocyclotriphosphazens. Der Einfluß des Lösungsmittels und mögliche Reaktions-mechanismen werden diskutiert.
    Notes: The reactions of pentachloro(2′, 2′, 2′-triphenylphosphazen-1′-yl)cyclotriphosphazene, N3P3Cl5(NPPh3), with primary and secondary amines have been investigated using diethyl ether, methyl cyanid or benzene as the solvent. The structures of the products obtained, N3P3Cl5minus;nRn(NPPh3) [n = 1, R = NHMe, NHBut, NMe2, NC5H10, NEt2; n = 2, R = NMe2, NC5H10, NEt2; n = 3, R = NMe2, NHBut; n = 5, R = NMe2] are elucidated by 1H and 31P NMR spectroscopy. The —NPPh3 substituent exerts a pronounced geminal directing influence on incoming secondary amino nucleophiles; compounds containing a ≡ PCl(NPPh3) group are not formed at the bis and subsequent stages of chlorine replacement. The reactions that involve primary amines follow the pattern established for the analogous reactions of hexachlorocyclotriphosphazene. The effect of solvent and possible mechanism(s) are discussed.
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