Catalytic Dehydrogenative Condensation of Silyl Hydrides and Amines: Thermal Decomposition of Silazanes and Polysilazanes

摘要

The synthesis of silazanes by the condensation of silyl hydrides and amines or ammonia has been shown to be catalyzed by palladium chloride or ruthenium dodecacarbonyl. The synthesis of diaminosilanes can also be catalyzed by the same catalysts. Attempts to prepare disilazanes from triethylsilane and butylamine were not successful. The synthesis of polysilazanes was shown to be possible at room temperature when palladium chloride was used as the catalyst. Ruthenium dodecacarbonyl was not useful under these conditions. The molecular weight of the polysilazane is dependent upon the rate of ammonia addition to the silane solution. When trihydrosilanes were condensed with ammonia no silicon hydrogen bonds remained in the polymer indicating that extensive crosslinking had occurred. 86 refs., 10 figs., 23 tabs. (ERA citation 14:017935)