The sensitized photooxygenation of methyl substituted 1, 2-diphenylcyclobutenes

…, GP Kirschenheuter, C Vaz, PP Umrigar, S Christensen

Index: Griffin, Gary W.; Kirschenheuter, Gary P.; Vaz, Caetan; Umrigar, Pesi P.; Lankin, David C.; Christensen, Siegfried Tetrahedron, 1985 , vol. 41, # 11 p. 2069 - 2080

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Citation Number: 11

Abstract

A series of Me substituted 1, 2-diphenylcyclobutenes was subjected to dye-sensitized photooxidanon in the presence ofmethylene blue. In the case of the 3, 3-dimcthyl-, 3, 3, 4- tnmethyl-and 3, 3, 4, 4tetramcthyl, 2-diphcnylcyclobutencs, the sensitized oxidations arc accompanied by ring-contraction with concomitant ortho hydroxylation of one aromatic nucleus. When electron transfer induced photooxidation techniques utilizing 9, 10- ...