Cyclopentene → Trichlorocyclopentylsilane

The experiment was conducted in substantially the same manner as in Example 1 by preparing a reaction mixture from 19.5 g (0.144 mole) of trichlorosilane, 9.9 g (0.146 mole) of cyclopentene and 0.14 g of the catalyst I corresponding to 238 ppm by weight as platinum based on the total amount of trichlorosilane and cyclopentene and heating the mixture in a polytetrafluoroethylene-made pressure-resistant vessel at 60° C. for 26 hours under a spontaneously produced pressure of 3 kg/cm2G. About 97% of the starting reactants had been reacted at the end of the reaction time as determined by the gas chromatographic analysis. Treatment of the reaction mixture after the reaction was performed in the same manner as in Example 1 to give cyclopentyl trichlorosilane in a yield of 91% as isolated based on the theoretical value.