Summary 1. Isobutyl-, 1-pentyl and cyclohexyltrichlorosilane and 1-, and 2- pentylmethyldichlorosilane have been prepared by the peroxide-catalyzed addition of trichlorosilane or methyldichlorosilane to the corresponding olefin. 1, 2-bis-(Trichlorosilyl)- ethane and 1, 3-bis-(trichlorosily1)-propane have been prepared by the addition of trichlorosilane to vinyl-and allyltrichlorosilane, respectively. 3. 1, 2-bis-(Trichlorosilyl)- ...