triethoxysilane involving formation of bis(silyl)ethene and bis(silyl)butanes as the main products accompanied by others of direct and dehydrogenative hydrosilylation, bi(silyl)ethane and ethylsilane as well as products of redistribution of triethoxysilane and formation of oligomers. The latter reaction is a consequence of consecutive oligomerization of bis(silyl)ethenes and other products. The effect