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Communication | Regular issue | Vol 57, No. 7, 2002, pp.1239-1245
Published online, 1st January, 1970
DOI: 10.3987/COM-02-9515
Photo-stimulated Heterolysis of the C(=O)-O Bond in (Z)-N-Acetyl-α-dehydrophenylalanine Aryl Ester Derivatives

Hideki Hoshina, Kentaro Nakayama,Tetsutaro Igarashi, and Tadamitsu Sakurai*

*Departmnet of Applied Chemistry, Faculty of Engineering, Kanagawa University, 3-27-1 Rokkakubashi, Kanagawa-ku, Yokohama 221-8686, Japan

Abstract

The irradiation of the title compounds [(Z)-1] in acetonitrile was found to give (Z)-2-methyl-4-(4-chlorobenzylidene)-5(4H)-oxazolone [(Z)-2] and phenols or naphthols (3), along with minor amounts of the Fries-rearranged products (4) and (E)-2. Solvent and substituent effects on the product distribution confirmed that the heterolytic cleavage of the ester C(=O)—O bond of the starting 1 in the excited singlet state is responsible for appearance of both 2 and 3 whereas 4 is derived from the homolysis (of the ester bond) taking place in competition with the predominant heterolysis of this bond. It was suggested that there is a pronounced contribution of charge transfer from the aryloxy oxygen to the parent π system in the excited singlet state.