[CH3:1][Si:2](C)([CH3:11])O[SiH](C)O[Si](C)(C)C.C[SiH](C)C=C[C:17]1[CH:22]=[CH:21][CH:20]=[CH:19][CH:18]=1.[CH3:24][Si:25]([CH3:35])([O:32]CC)[C:26]1[CH:31]=[CH:30][CH:29]=[CH:28][CH:27]=1.O.Cl>>[C:26]1([Si:25]([CH3:35])([CH3:24])[O:32][Si:2]([C:17]2[CH:18]=[CH:19][CH:20]=[CH:21][CH:22]=2)([CH3:11])[CH3:1])[CH:31]=[CH:30][CH:29]=[CH:28][CH:27]=1Five millimoles of 1,1,1,3,5,5,5-heptamethyltrisiloxane, 5 mmol of dimethylphenylvinylsilane, and 5 mmol of dimethylethoxyphenylsilane were mixed. To the mixture were added 5 mmol of water, 5×10-4 mmol of a platinum-vinylsiloxane complex, and 0.1 mmol of hydrochloric acid, followed by stirring at room temperature for 3 hours. Quantitative determination of the reaction product by gas chromatography revealed that 2,2-di-trimethylsiloxy-5-phenyl-5-methyl-2,5-disilahexane was obtained in a yield of 99% as a hydrosilylation addition product and 1,3-diphenyl-1,1,3,3-tetramethyldisiloxane was obtained in a yield of 99% as an alkoxysilane condensation product.
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