engleski

Photoreactions of ortho-vinyl triphenylethylenes I. The photochemsitry of 1, 2-diphenyl-1-(2-vinylphenyI)ethylene

Irradiation of the title compound (9) causes two types of photoreactions. endo-1, 6-Diphenyl- 2, 3-benzobicyclo[3.1.0]hex-2-ene, endo-(13) is a primary photoproduct resulting from an intramolecular [4+2]cycloaddition ; it is partially converted into-exo-(13). [2+2]Cycloaddition does not occur. This results fits well into the general scheme previously proposed for the photochemical behaviour of o-vinylstilbenes. The other photoproducts (14-17) are formed via electrocyclisation reactions occurring in the divinylbenzene moity and in a cis-stilbene moiety of 9.

photochemistry; benzobicyclo[2.1.1]hexene; cycloaddition

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