A method for the preparation of organopolysiloxanes and a new organopolysiloxane

摘要

Organopolysiloxanes containing hydrogen bonded directly to silicon and containing 3 to 5 silicon atoms per molecule are prepared by reacting a symmetric disiloxane of the formula (R3Si)2O with a silane of the formula RaSi(OR1)4-a where the radicals R are each hydrogen or identical or different, monovalent, SiC-bonded organic radicals, and the radicals R1 are identical or different, optionally alkoxy-substituted alkyl radicals, and a is 0, 1 or 2, with the proviso that at most one hydrogen atom is bonded directly to each silicon atom, at least one reactant contains hydrogen bonded directly to silicon, and that the disiloxane has been prepared before addition of the silane, and with water in the present of acid. The organopolysiloxane of the formula [H(CH3)2SiO]3SiH is new. f