METHOD FOR PREPARING VINYLSILANE

PROBLEM TO BE SOLVED: To provide a method for preparing a vinylsilane by which a high conversion rate accompanied with a high selectivity can be achieved with an ultrahigh space time yield. SOLUTION: A silane is added to a liquid phase containing an acetylenic hydrocarbon and a catalyst in the method for preparing the vinylsilane comprising reacting the acetylenic hydrocarbon with the silane having at least one silicon-bound hydrogen atom in the presence of a catalyst in the liquid phase. In particular, the reaction is carried out under a superatomic pressure and the spent acetylenic hydrocarbon is replenished during the reaction so as to maintain a pressure which is constant during the entire reaction. As a specific example, acetylene is reacted with trimethoxysilane in the presence of a tetramethyldivinyldisiloxaneplatinum solution in xylene as the catalyst in the xylene liquid phase to produce trimethoxyvinylsilane in high yield.