Process for preparing organosilicon compounds containing organyloxy groups

A process for the production of compositions comprising organosilicon compounds having organyloxy groups, comprising:

• in a first step
• mixing at least one organosilicon compound (E) comprising at least one silanol group with at least one compound (B) comprising at least two organyloxy groups in the presence of at least one base (C1) selected from the group consisting of guanidines, amidines, lithium-containing bases, and the mixtures thereof, and reacting the mixture to form a resultant reaction mixture, and
• in a second step
• admixing one or more phosphorus compounds (C3) having a P═O group with the resultant reaction mixture, and capable of salt formation with base (C1) wherein at least one phosphorus compound (C3) having a P═O group is selected from the group consisting of phosphorus compounds of the formula
• O═PR16m(OR17)n(OH)3−(m+n) (VII),
• where
• m is 0 or 1,
• n is 0, 1, 2 or 3,
• m+n is 1, 2 or 3,
• R16 is an optionally substituted hydrocarbon moiety,
• R17 each is identical or different, and is an optionally substituted hydrocarbon moiety which
• is optionally interrupted by heteroatoms, is a triorganosilyl moiety bonded by way of Si, is an organoalkoxysilyl moiety bonded by way of Si, or is a phosphate moiety bonded by way of P,
• with the proviso that if R17 is an optionally substituted hydrocarbon moiety, then m is equal to 0 and n is equal to 1 or 2, and wherein compound (B) is selected from the group consisting of methyltrimethoxysilane, dimethyldimethoxysilane, tetramethoxysilane, vinyltrimethoxysilane, methylvinyldimethoxysilane, methyltriethoxysilane, tetraethoxysilane, phenyltrimethoxysilane, n-butyltrimethoxysilane, isobutyltrimethoxysilane and tert-butyltrimethoxysilane, partial hydrolyzates of these and mixtures thereof.