| Abstract: | Formation of Organosilicon Compounds. 77. Formation of Carbosilanes from Methylsilanes The products formed by pyrolysis of me3SiH, me2SiH2, and meSiH3 are reported. Sime4 and the mentioned methylsilanes were reacted in a plasma, and the products are compared to those of the pyrolysis. The pyrolysis of me3SiH and me2SiH2 essentially yields the same groups of carbosilanes which are accessible by thermal decomposition of Sime4, if the range is restricted to compounds with 4 Si atoms at most. Cylic carbosilanes are the main products of the pyrolysis of me3SiH, and amoung these, 1,3,5-trisilacyclohexanes and 1,3,5,7-tetrasilaadamantanes are preferrently formed. From me2SiH2 above all linear compounds as 1,3-disilapropanes are obtained. This is attributed to the chosen experimental procedure in which they not subject to further reaction. In the pyrolysis of meSiH3 a yellow solid is formed besides little amounts of meH2Si? SiH2me. Compared to the compounds formed by pyrolysis of Sime4, the carbosilasen obtained from me3SiH and me2SiH2 possess more SiH substituents. Also the decomposition of Sime4 in a plasma preferrently yields carbosilanes, mainly linear compounds with 2 or 3 Si atoms. |
