Mechanism of photorearrangement of bicyclo[3.3.1]nona-3,7-diene-2,6-diones
Abstract
Irradiation of some 9-arylbicyclo[3.3.1]nona-3,7-diene-2,6-diones gives triasteranediones by successive 1,2-acyl migrations and 6-arylbicyclo[3.3.1]nona-3,7-diene-2,9-diones by 1,3-rearrangement. Emission, photosensitisation, and quenching studies show that both photorearrangements are triplet-derived, and these results are contrasted with other studies of βγ-unsaturated ketones.