
doi: 10.1246/bcsj.61.3782
Abstract 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.
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