Photoreactions of 3a,7a-dihydro-3,3a,5,6-tetraphenylinden-1 -one
Abstract
Irradiation of the title compound (3; R = Ph) gives mainly 3a,7a-dihydro-3,4,5,7a-tetraphenylinden-1-one (4) together with the 3,4,7,7a-tetraphenyl isomer (6) and the di-π-methane rearrangement product 1,3,8,9-tetra-phenyltricyclo[4.3.0.02,9]nona-3,7-dien-5-one (5).