Photochemistry of 2,3-, 4,5-, and 2,7-azepinobenzodioxins: photochemical rearrangement of 2,7-azepinobenzodioxin to 2,3- and 4,5-azepinobenzodioxins, and formation of 2,3-dihydrodibenzodioxin from 2,3- and 4,5-azepinobenzodioxins

摘要

Photoirradiation of a 2,7-azepinobenzodioxin with a low pressure mercury lamp afforded 2,3- and 4,5-azepinobenzodioxins, a 2,3-dihydrodibenzodioxin, and an azepine derivation. The analogous irradiation of a 2,3-azepinobenzodioxin gave a 2,3-dihydrodibenzodioxin. On the other hand, a 4,5-azepinobenzodioxin formed a dihydropyrrole derivative accompanied by a 2,3-dihydrodibenzodioxin. The effects of solvents and sensitizers were investigated.