Sv. Kessar et Aks. Mankotia, PHOTOREACTIVITY OF CONJUGATED BICHROMOPHORIC MOLECULES - AN UNUSUAL DIMERIZATION OF O-VINYLBENZALDEHYDE, Journal of the Chemical Society, Chemical Communications, (24), 1993, pp. 1828-1829
Irradiation of o-vinylbenzaldehyde la affords the oxygen-bridged dimer
7a, presumably, through an initial [pi2a + pi4s] rearrangement; inter
mediacy of spiro triene 6 is supported by deuterium labelling experime
nts which also reveal the reversible nature of the concurrently,occurr
ing 1,5-hydrogen shift (1 reversible 2).