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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1978 (1978), S. 2033-2043 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Isomeric Heterocycles by Cyclisation of syn- and anti-α-Amino HydrazonesThe syn- and anti-α-amino hydrazones 1 and 2, respectively, were prepared. The syn-isomers 1 react with formaldehyde and with phosgene to give the 1,2,4-triazines 3 and 4, respectively. The anti-isomers 2 cyclise with phosgene giving the 1-anilinoimidazolin-2-ones 5, or if C-α is a tertiary atom the 1-anilino-5-methyleneimidazolidin-2-ones 8.  -  On mass spectroscopy, compounds 5 and 8 show the characteristic exocyclic amine fragment. Structures were established by spectroscopic methods supplemented by complexation studies on the α-amino hydrazones.
    Notes: Es wurden die syn- sowie anti-α-Aminohydrazone 1 bzw. 2 hergestellt und ihre Konfigurationen spektroskopisch und durch Komplexbildung bestimmt. Aus 1 entstehen durch Umsetzung mit Formaldehyd oder Phosgen die 1,2,4-Triazin-Derivate 3 bzw. 4. Die anti-Verbindungen 2 cyclisieren mit Phosgen zu 1-Anilino-4-imidazolin-2-onen 5, wenn C-α ein tertiäres C-Atom ist aber zu 1-Anilino-5-methylenimidazolidin-2-onen 8.  -  Die Struktur der Heterocyclen wurde spektroskopisch bestätigt. 5 und 8 sind massenspektrometrisch durch Abspaltung des exocyclischen Aminfragmentes charakterisiert.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1982 (1982), S. 729-733 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Synthesis of 4H-1,2,5-Triazepine Derivatives from syn-α-Amino Hydrazonessyn-α-Anilinoacetophenone hydrazones 1 were acylated by chloroacetyl chloride. By the Finkelstein reaction α-(2-iodoacetylamino) hydrazones 3 were formed and cyclocondensed to yield 2,3,5,6-tetrahydro-4H-1,2,5-triazepin-4-ones 4 using sodium hydroxide (phase-transfer catalysis). 1 reacts with oxalyl chloride only to give the oxamides 5.
    Notes: syn-α-Anilinoacetophenonhydrazone 1 wurden mit Chloracetylchlorid acyliert und durch die Finkelstein-Reaktion in α-(2-Iodacetylamino)hydrazone 3 übergeführt. Cyclokondensation mittels Natriumhydroxid durch Phasentransfer-Katalyse führt zu 2,3,5,6-Tetrahydro-4H-1,2,5-triazepin-4-on-Derivaten 4. Mit Oxalylchlorid reagiert 1 nur zu Oxamiden 5.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1989 (1989), S. 589-591 
    ISSN: 0170-2041
    Keywords: 1H-Pyrazoles ; Benzoin phenylhydrazone ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Pyrazoles by Cyclisation of Benzoin Phenylhydrazone with AldehydesBy fusing (E)- or (Z)-benzoin phenylhydrazone and aldehydes, 3-substituted 1H-pyrazoles (2) are obtained. The structure of 2d was confirmed by X-ray analysis.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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