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  • General Chemistry  (1)
  • O,N,N-substituted/Hydraziens  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Unusual C=C Bond Migration in 3-Ylidene-2,5-piperazinediones (2000)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 2000 (2000), S. 1993-1999 
    Details
    ISSN: 1434-193X
    Keywords: Ketones ; Tautomerism ; Double bond migration ; Peptides ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: ---Treatment of 3-alkylidene or 3-benzylidene-2,5-piperazinediones 6 with catalytic amounts of acid gives rise to the formation of isomers 7 by migration of the C=C bond into the alkyl substituent at position 6, or results in mixtures of racemic 7 and E isomers 8. The existence of tautomeric equilibria is discussed.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 2
    Electronic Resource
    Electronic Resource
    Darstellung und Reaktionen von N-Phenacyl-N-tosylhydroxylaminen und -hydrazinen (1991)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1991 (1991), S. 983-986 
    Details
    ISSN: 0170-2041
    Keywords: Hydroxylamines ; O,N,N-substituted/Hydraziens ; N,N′-substituted ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Preparation and Reactions of N-Phenacyl-N-tosylhydroxylamines and -hydrazinesO-Alkyl-N-phenacyl-N-tosylhydroxylamines 3 were prepared in two steps from O-alkylhydroxylamines 1. In the presence of a base the N-tosylhydroxylamines 3 undergo rearrangement and cleavage to N-tosylphenacylamine (5) and aldehydes 6. N-Alkul-N′-phenacyl-N,N′-ditosylhydrazines 12 were obtained by stepwise treating of N,N′-ditosylhydrazine with alkyl halide and phenacyl bromide/potassium tert-butoxide/DMF.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.1991199101171
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