Vaid, "A study of simultaneous photolysis and photoaddition
reactions of riboflavin in aqueous solution," Journal of Photochemistry and Photobiology B, vol.
of N-substituted piperazines to [C.sub.60]: an efficient approach to the synthesis of water-soluble fullerene derivatives," Chemistry, vol.
It suggests that the electronic decay point, which is bonded-intermediate structure, may lead to either [2 + 2] photoaddition product or reversal, depending on the vibrations of [C.sub.1], [C.sub.2], [C.sub.1]', and [C.sub.2]' atoms.
Decay from this CI point may lead to either [2 + 2], [2 + 3], or [2 + 4] photoaddition product, although formation of [2 + 3] product seems most probable because of the short [C.sub.3]-[C.sub.2]' distance.
It has been shown that very efficient photoaddition
of HCl onto polyene occurs for sequence length of three to eight, and this process brings a redistribution of polyene sequences length as Eq.
Recent studies include work on stereoselective [2+2] photoadditions
and functionalization/fragmentation of the adducts to provide building blocks for the total synthesis of sesquiterpenoids.