Silicon-carbon unsaturated compounds XL. Photolysis of 1,4-bis(2-phenyltetramethyldisilanyl)-benzene

Article abstract of DOI:10.1016/0022-328X(92)83395-X

The photolysis of 1,4-bis(2-phenyltetramethyldisilanyl)benzene (1) in the presence of isobutene in benzene gave 4-(isobutyldimethylsilyl)-1-(2-phenyltetramethyldisilanyl)-3-(dimethylphenylsilyl)benzene, 2-(isobutyldimethylsilyl)-1-silyl>benzene, and 1,4-bis(isobutyldimethylsilyl)-2,5-bis(dimethylphenylsilyl)benzene in 49, 4 and 12percent yields, respectively, along with small amounts of 1-(2-phenyltetramethyldisilanyl)-4-(dimethylphenylsilyl)benzene (6) dimethylphenylsilane (7) and dimethyldiphenyl-silane (8a).Irradiation of 1 in the absence of isobutene afforded 5a (2percent yield), 6 (less than 1percent yield), 7 (2percent yield)and 8a (3percent yield).Similar irradiation of 1 in deuteriobenzene produced a mixture of 5a and 4-<(pentadeuteriophenyl)dimethylsilyl>-1-(2-phenyltetramethyldisilanyl)benzene, in addition to 6, 7 and (pentadeuteriophenyl)dimethylphenylsilane.