Photoaddition of 2,3-dimethylmaleic anhydride to selenophthene

As a continuation of studies carried out in this laboratory 2] on the properties of selenophene and its methyl derivatives as substrates for excited carbonyl compounds and for methylmaleic anhydride derivatives in photosensitized reactions benzob]selenophene and selenophthene were tested as well. The latter were found to be inert in oxetane formation but good substrates in photosensitized reactions.