Lewis acid catalysis of photochemical reactions. 8. Photodimerization and cross-cycloaddition of coumarin
作者:Frederick D. Lewis、Steven V. Barancyk
DOI:10.1021/ja00205a015
日期:1989.11
Photodimerisation de la coumarine en hexahydro-6,6a,6b,7,12b,12c cyclobuta [1,2-c:4,3-c']-et-[1,2-c:3,4-c'] bisbenzopyranne-1 diones-6,7 et -6,12
香豆素六氢-6,6a,6b,7,12b,12c cyclobuta [1,2-c:4,3-c']-et-[1,2-c:3,4-c'] 的光二聚化双苯并吡喃-1 diones-6,7 et -6,12
A Reinvestigation of a Sensitized Photochemical Cycloaddition of Coumarin with Cyclopentene
作者:Hiroshi Suginome、Kazuhiro Kobayashi
DOI:10.1246/bcsj.61.3782
日期:1988.10
A reinvestigation of a sensitized photochemical cycloaddition of coumarin with cyclopentene reported by Hanifin and Cohen indicated that the cycloaddition gives a sterically disfavored cis-cisoid-cis adduct (18%) together with a cis-transoid-cis adduct (25%) and a head-to-head coumarin dimer with a cis-transoid-cis disposition. The two adducts behaved differently in hydrolysis and recyclization.