Higher alkoxy-substituted organopolysiloxane

A method for the preparation of a higher alkoxy-substituted diorganopolysiloxane represent-ed by the general formula

• R.sup.4 R.sup.2.sub.2 Si--O--(--SiR.sup.2.sub.2 --O--).sub.p --(--SiR.sup.2 R.sup.3 --O--).sub.q --SiR.sup.2.sub.2 R.sup.4,
• in which R.sup.2 is, each independently from the others, an unsubstituted or substituted monovalent hydrocarbon group having 1 to 15 carbon atoms, R.sup.3 is an alkoxy group having 4 to 30 carbon atoms, R.sup.4 is R.sup.2 or R.sup.3, the subscript p is zero or a positive integer and the subscript q is a positive integer with the proviso that p+q is 13 or larger, which comprises:
• subjecting an organohydrogenpolysiloxane represented by the general formula
• R.sup.1 R.sup.2.sub.2 Si--O--(--SiR.sup.2.sub.2 --O--).sub.p --(--SiR.sup.2 H--O--).sub.q --SiR.sup.2.sub.2 R.sup.1,
• in which R.sup.2 has the same meaning as defined above, R.sup.1 is a hydrogen atom directly bonded to the silicon atom or R.sup.2 and the subscripts p and q each have the same meaning as defined above, and an aliphatic alcohol represented by the general formula
• R.sup.3 H,
• in which R.sup.3 has the same meaning as defined above, to a dehydrogenation reaction in the presence of a platinum compound and an organic acid.