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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 106 (1973), S. 2643-2647 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Condensation of Ethyl Crotonate, 3-Methylcrotonate, and Isopropylidenemalonate with Aromatic AldehydesWith sodium amide in dimethylformamide ethyl crotonate and 3-methylcrotonate react with aromatic aldehydes to yield directly 5-aryl- and 5-aryl-3-methyl-2,4-pentadienoic acid (3), respectively. Under the same conditions the reaction of aromatic aldehydes with diethyl isopropylidenemalonate leads to 6-aryl-4-(2-arylvinyl)-2-oxo-5,6-dihydro-2H-pyran-3-carboxylic acids (6).
    Notes: Unter der Einwirkung von Natriumamid in Dimethylformamid entstehen aus den Äthylestern der Croton- und 3-Methylcrotonsäure und aromatischen Aldehyden direkt 5-Aryl- bzw. 5-Aryl-3-methyl-2,4-pentadiensäuren (3). Unter denselben Bedingungen führt die Umsetzung der aromatischen Aldehyde mit Isopropylidenmalonsäure-diäthylester zu 6-Aryl-4-(2-arylvinyl)-2-oxo-5,6-dihydro-2H-pyran-3-carbonsäuren (6).
    Type of Medium: Electronic Resource
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