Solvent Dependent Photochemical Reactions of 3-(2-Alkylphenyl)-2,2-dimethyl-3-oxopropanoates and Their Related Compounds
摘要:
Photochemical reactions of methyl 3-(o-alkylphenyl)-2,2-dimethyl-3-oxopropanotes in hexane gave only the corresponding benzocyclobutenols. However, when irradiation was carried out in methanol, 3-oxonaphthalenones were produced together with the benzocyclobutenols. The ratio of benzocyclobutenol to naphthalenone depends on the bulkiness of the alkyl group in the ortho position. Intermediary 1,4-diradicals or dienols were efficiently trapped by oxygen to afford the corresponding peroxides and/or oxygenated compounds derived from the peroxides.
3-Hydroxy-4-alkoxycarbonyl-butenolides were prepared by one-pot cyclizations of 1,3-bis(silyloxy)alk-1-enes with oxalyl chloride. (c) 2007 Elsevier Ltd. All rights reserved.
BROCARD, JACQUES;PELINSKI, LYDIE;LEBIBI, JACQUES;MAHMOUDI, MADANI;MACIEJE+, TETRAHEDRON, 45,(1989) N, C. 709-720