Mechanisms of photochemical reactions in solution. LXIII. 1,2- and 1,3-Benzyl group migration in compounds containing phenyl and conjugated dienyl chromophores
The photochemical formation of bicyclooctenes b from 12,13-didehydrosqualene (1) upon irradiation at wavelengths longer than 290 nm is reported. The same photoreaction is also observed with trienes 7 and 8 which like 1 have a remote double bond two C-atoms removed from the triene system. A configurational assignment for bicyclooctene 10 obtained from 8 and a mechanism for the observed photochemical