The photochemical reaction of 1, 1, 4, 4-tetramethyl-2, 3-tetralindione, 1, with hydrogen donors, such as xanthene and aldehyde, in the liquid phase has been investigated. When xanthene was selected as the hydrogen donor, the main products were the “1, 2-adduct,” photo-reduced α-keto alcohol, and 9, 9′-bixanthenyl. The photolysis of 1 and an aldehyde gave the mixture of the “1, 2-adduct” and the “1, 4-adduct.” However, in the reaction with ...
