o-Quinonoid compounds. Part VIII. Photodecarbonylation of 1,3-diphenylinden-2-one adducts; 1,5-sigmatropic shifts in sterically stabilised o-quinodimethanes
Abstract
Photodecarbonylation of the 1,3-diphenylinden-2-one-substituted maleimide adducts (9a and b) gave the sterically stabilised o-quinodimethanes (3b and c), which undergo 1,5-sigmatropic shift of the imido-group rather than alkyl migration.