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  • 1
    Electronic Resource
    Electronic Resource
    Enhydrazine, 9. 1-Alkyl-3-hydroxypyrazole aus Hydrazonen oder Hydrazinen (1974)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 107 (1974), S. 1318-1328 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Enehydrazines, 9. 1-Alkyl-3-hydroxypyrazoles from Hydrazones or HydrazinesReaction of dimethyl acetylendicarboxylate with hydrazinen oder Alkyl hydrazonen gives the methyl 1-alkyl-3-hydroxy-5-pyrazolecarboxylats 9 and 13a-e, subsequent saponification and decarboxylation gives the 1-alkyl-3-hydroxypyrazoles 11 and 15a-e. The cyclization of 13f to lactone 19a is a structure proff. Starting from benzaldehyde hydrazones, 2-pyrazoline-4,5-dicarboxylic esters are the main products.
    Notes: Durch Umsetzung von Acetylendicarbonsäure- dimethylester mit Hydrazinen oder Alkyl-hydrazonen erhält man die 1-Alkyl-3-hydroxy-5-pyrazolcarbonsäure-methylester 9 und 13a-e, durch Verseifung und Decarboxylierung hieraus die 1-Alkyl-3-hydroxypyrazole 11 und 15a-e. Die Cyclisierung von 13f zum Lacton 19a ist strukturbeweisend. Bei Verwendung von Benzaldehyd-hydrazonen entstehen hauptsächlich 2-Pyrazolin-4,5- dicarbonsäureester.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19741070428
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  • 2
    Electronic Resource
    Electronic Resource
    Enhydrazine, 61) Weitere Enhydrazone, Tetrahydroindazolone und Enhydrazine aus cyclischen β-Dicarbonylverbindungen (1973)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 106 (1973), S. 450-459 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Enehydrazines, 61) Further Enehydrazones, Tetrahydroindazolones and Enehydrazines from Cyclic β-Dicarbonyl CompoundsDimedone, 1,3-cyclohexanedione, and 2-methyl-1,3-cyclopentanedione react with benzaldehyde alkylhydrazones to give further enehydrazones (4e, f, 5a-e, 17b-e). Some of the enehydrdzones are hydrogenated to enehydrazines (19a, b, 20b, c). Additionally, the preparation of further tetrahydroindazolones (6e, f, 7a-f, 9, 10, 13, 15) from dimedone and 1,3 cyclohexanedione is described.
    Notes: Aus Dimedon, 1,3-Cyclohexandion und 2-Methyl-1,3-cyclopentandion werden mit Benzaldehyd-alkylhydrazonen weitere Enhydrazone (4e, f, 5a-e, 17b-e) erhalten, die z. T. zu Enhydrazinen (19a, b, 20b, c) hydriert werden. Ferner wird die Darstellung weiterer Tetrahydroindazolone (6e, f, 7a-f, 9, 10, 13, 15) aus Dimedon und 1,3-Cyclohexandion beschrieben.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19731060211
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    Paper (German National Licenses)
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