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Selective photoexcitation of phenanthrene in a radical transfer from phenanthrene cation radicaI to mixture of phenanthrene, a-methylstyrene, and nza-methylstyrene. dicyanobenzene in MeCN and in MeCN-MeOH ( 1 : 1) gave 1,4-dimethyl-1-phenyl-1,2,3,4-tetrahydronaphtha-RECENTLY the photodimerization of olefins via cation lene and 1,4-dimethyl-1-methoxy-1 ,kdiphenylbutane, radicals has been extensively studied and a cation radical respectively, products which are formed from the atransfer mechanism has been proposed for the dimerization methylstyrene cation radical which is formed by cation of olefins in the dark reaction,l and in the photochemical