Sequential multiple-photon photochemistry of sterically congested enones

Article abstract of DOI:10.1016/0040-4039(96)00284-5

The photochemistry of sterically hindered enones 1 and 2 is described. A novel photorearrangement occurs in both systems which involves carbonyl attack on the adjacent phenyl ring, expansion of that ring to a cycloheptatriene and subsequent photochemically induced 1,7-phenyl migration.