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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1979 (1979), S. 650-655 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Thermal and Photochemical Reactions of New Mesoionic 1,3-Oxazol- and 1,3-Thiazol-5-onesThe preparation of the mesoionic 1,3-oxazol-5-one 2 and of the 1,3-thiazol-5-one 4, both substituted with donor and acceptor groups, and their reactions with water or methanol are described Compound 2 combines with dimethyl acetylenedicarboxylate at 1200C with formation of the pyrroledicarboxylic ester 6 (6%) as a result of a [3 + 2]-cycloaddition reaction. Photochemically, 4 undergoes ring-opening to the ketene 9, which reacts with methanol to give the ester 10.
    Notes: Die Darstellung des mit Donor- und Akzeptorgruppen substituierten mesoionischen 1,3-Oxazol-5-ons 2 und des 1,3-Thiazol-5-ons 4 sowie ihre Reaktionen mit Wasser oder Methanol werden beschrieben. Mit Acetylendicarbonsäure-dimethylester vereinigt sich 2 bei 1200C zum Pyrroldicarbonsäureester 6 (6%) als Ergebnis einer [3 + 2]-Cycloaddition. Photochemisch erleidet 4 Ringöffnung zum Keten 9, das mit Methanol zum Carbonsäureester 10 reagiert.
    Type of Medium: Electronic Resource
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