T. Tsuno et al., ALLENYL(VINYL)METHANE PHOTOCHEMISTRY - PHOTOCHEMISTRY OF 4,4,7-TRIMETHYL-5-PHENYL-2,5,6-OCTATRIENATE DERIVATIVES, Tetrahedron letters, 38(9), 1997, pp. 1581-1584
The direct photolysis of the diester in the title compounds gave a cro
ss conjugated triene, [2+2] cycloadduct, pyran, and cyclopropene. The
direct photolysis of the monoester afforded a cross conjugated triene,
[2+2] cycloadduct, cyclopropene, and its Z-form. The sensitized photo
lysis of these esters afforded the trienes and [2+2] cycloadducts, whi
ch were derived from the triplet excited state of the different chromo
phores. (C) 1997 Elsevier Science Ltd.