Cross-linkable organopolysiloxane materials formed into elastomers by separating alcohols

Process for the preparation of an organopolysiloxane with organyloxy end groups, in which

• (A) an organopolysiloxane with HO end groups is reacted with
• (B) an alkoxysilane which has at least two alkoxy groups and a radical which contains at least one secondary or tertiary amino group, which is bonded to the silicon atom via a divalent C1-12-hydrocarbon radical, in the presence of
• (C) an acidic phosphoric ester of the general formula (IV)
• (HO)aOP(—O—R7)(3−a) (IV)
• in which
• R7 has the general formula V
• [(CR82)b—O]c[(CR92)d]o—L—M (V)
• in which
• R8 and R9 denote a hydrogen, methyl or hydroxyl radical,
• b and d denote the values 2 or 3,
• c denotes integral values from 1 to 15,
• a denotes the values 1 or 2,
• L denotes a radical from the group consisting of —O—, —COO—, —OOC—, —CONR2—, —NR2CO— and —CO— wherein R2 denotes a monovalent C1-C10-hydrocarbon radical which is optionally substituted by flourine, chlorine, bromine, C1-C4-alkoxyalkyl or cyano group,
• M denotes a monovalent C1— to C20-hydrocarbon radical which is optionally substituted by hydroxyl, fluorine, chlorine, bromine, C1-C10-alkoxyalkyl or cyano groups, with the proviso that only one of the radicals R8 and R9 on a given carbon atom can be a hydroxyl radical o denotes 0 or 1.