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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 117 (1984), S. 2875-2885 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reactions of Unsaturated Aldehyde Dimethylhydrazones with Electrophilic ReagentsCrotonaldehyde dimethylhydrazone (1) is substituted at C-3 by electrophiles such as chlorine, bromine, iodine, arylsulfenyl chloride, phenylsulfinyl chloride, and nitronium tetrafluoroborate to form the products 10a  -  c, 18a, b, 25, and 26. In contrast, from 1 and p-nitrobenzoyl chloride the dienehydrazide 3 is obtained. Acrolein dimethylhydrazone reacts with diazoacetic ester to give the cyclopropane derivative 29. Isoxazole 32 is obtained from 28 and p-chlorobenzonitrile oxide.
    Notes: Crotonaldehyd-dimethylhydrazon (1) wird durch elektrophile Reagenzien wie Chlor, Brom, Iod, N-Chlorsuccinimid, Arylsulfenylchlorid, Phenylsulfinylchlorid oder Nitryl-tetrafluoroborat and C-3 unter Bildung der Produkte 10a  -  c, 18a, b, 25 und 26 substituiert. Bei Einwirkung von p-Nitrobenzoylchlorid auf 1 erhält man dagegen das Dienhydrazid 3. Acrolein-dimethylhydrazon (28) reagiert mit Diazoessigester zum Cyclopropanderivat 29, mit p-Chlorbenzonitriloxid zum Isoxazolin 32.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 123 (1990), S. 399-404 
    ISSN: 0009-2940
    Keywords: β-Halovinyl ketones / β-Halovinyl aldehydes / α-Alkoxyvinyl ketones ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Electrophilic β-Bromination and Nucleophilic α-Methoxylation of α,β-Unsaturated Carbonyl CompoundsOximes 29a, b, semicarbazones 11a-d, dimethylhydrazones 4, and [3-methyl-2(3H)-benzothiazolylidene]hydrazones 23a-c of unsaturated aldehydes and ketones are brominated at the β-carbon by an addition-elimination sequence (→ 21a,b, 13a-d, 7, and 27c, respectively). When unsaturated ketone hydrazones are treated with bromine and methanol the α-methoxy-β-bromo derivatives 35a-c are obtained, which after hydrolysis and hydrobromic acid elimination give α-methoxy substitution products 36a-c of the starting compounds.
    Type of Medium: Electronic Resource
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