PROCESS FOR PREPARING TRIS(SILYL) METHANES

摘要

Tris silyl methane of formula (III) is prepared by reacting a silane cpd. of formula (I) contg. dichloromethyl with hydrogen chloride or the mixt. of alkyl chloride of formula (II) which generates HCl to the reaction temp., in the presence of copper or copper cpd. as catalyst of 1-20 wt.% w.r.t. the reactant, pref. under 1-5 atms.. In the formulas, R1,R2 and R3 each are CH3 or Cl; R is H, C1-4 alkyl or CH2CH2Cl; R4 and R5 are SiHCl2; or R4 is SiHCl2 and R5 is SiCl3; or R4 and R5 are SiCl3. Pref. opt. 1-50 wt.% of an acidic white earth of spherical fine powder is added w.r.t. the amt. of silica.