PHOTOCHEMISTRY OF ISOTHIOCHROMAN-4-ONE

被引:45
作者
LUMMA, WC
BERCHTOL.GA
机构
[1] Department of Chemistry, Massachusetts Institute of Technology, Cambridge
关键词
D O I
10.1021/jo01258a007
中图分类号
O62 [有机化学];
学科分类号
070303 ; 081704 ;
摘要
Irradiation of isothiochroman-4-one in cyclohexane (high pressure mercury lamp, Pyrex 7740 filter) produced thiochroman-3-one (21%). Under similar conditions 7-methoxy-, 8-methyl-, 3-methyl-, and 3,3-dimethyl-isothiochroman-4-one rearranged to 6-methoxy- (40%), 5-methy1- (30%), 2-methy1- (30%), and 2,2-dimethyl-thiochroman-3-one (37%), respectively. 1,2,3,4-Tetrahydro-1-keto-3-thiaphenanthrene failed to undergo the rearrangement reaction. Irradiation of 5-methyl-2,3-dihydro-2H,6H-thiopyran-3-one under similar conditions resulted in rearrangement to 2-(2-prop-1-enyl)-1-thietan-3-one (28-35%). The pathway for the photochemical conversion of isothiochroman-4-ones into thiochroman-3-ones is discussed. © 1969, American Chemical Society. All rights reserved.
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页码:1566 / &
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