Photoisomerisation of the adduct of bicyclohept-1-en-1-yl and 2,5-dimethyl-p-benzoquinone
Abstract
The adduct (4) of bicyclohept-1-en-1-yl and 2,5-dimethyl-p-benzoquinone on exposure to light isomerizes to the pentacyclic product (3) by a long range hydrogen migration which has been previously observed in analogous systems under electron impact.