| abstract |
Abstract of the Disclosure A method of making organopolysiloxanes comprises contacting organosilicon compounds having at least one unit wherein R° is hydrogen, hydroxyl, a C1-18 hydrocarbon, substituted hydrocarbon or hydrocarbonoxy group and a has a value of from 0 to 4 with a phosphonitrile halide AB, wherein A is a phosphonitrile halide cation [X(PX2=N)nPX3]+, wherein X is halide and n is from 1 to 8 and B is an anion derived from a Lewis acid not containing a P atom, e.g. [MX(v-t+1)R2t]-. The method is particularly useful for condensation of silanol end-blocked siloxanes. |