Photochemistry of isopiperitenone and 4-acetoxyisopiperitenone. An unprecedented photochemical reaction of an α,β-unsaturated ketone
作者:William F. Erman、Thomas W. Gibson
DOI:10.1016/s0040-4020(01)82796-4
日期:1969.1
(±)-26 was photochemically converted to 28 (15%) and 4-carbomethoxymethyl-1-acetoxy-2,4-dimethylcyclohexene (29) (65%). Hydrolysis of 28 yielded the alcohol derivative 30. Treatment of 5 and 30 with hydrogen bromide produced the bromoketones 10 and 31, respectively. A mechanism for production of the esters 6 and 28 is presented which involves an unprecedented cleavage of an α,β-unsaturated ketone.
使用派热克斯滤光片在环己烷中对(+)-异哌啶酮(4)和(±)-4-乙酰氧基异哌啶酮(26)进行紫外线照射,得到(+)-1,2-二甲基三环[3.3.0.0 2,7 ] octan -6-一(5)的产率为35-42%,5-乙酰氧基-1,2-二甲基三环[3.3.0.0 2,7 ] octan -6-一(28)的产率为42%。在甲醇中辐照(+)- 4产生的(+)-酮5的产率为25%,(±)-5-羰甲氧基甲基-1,5-二甲基环己烯(6)的产率为49%。在甲醇(±)-26中将其光化学转化为28(15%)和4-羰甲氧基甲基-1-乙酰氧基-2,4-二甲基环己烯(29)(65%)。水解28得到醇衍生物30。用溴化氢处理5和30分别产生了溴酮10和31。提出了产生酯6和28的机理,该机理涉及对α,β-不饱和酮的空前裂解。