Silanes, process for their preparation, and their use

摘要

Compounds of the formula Ia <IMAGE> (Ia) in which X and R1 to R6 are as defined in the claims, are obtainable by reacting monochlorosilanes of the formula II <IMAGE> (II) with tetrasubstituted ethylenes of the formula III <IMAGE> (III) X as Cl and Br can be replaced by ester groups of inorganic and organic acids. The compounds of the formula I and those with other ester groups are suitable especially as a protective-group reagent for hydroxyl, mercapto, carboxyl, amino and amide groups.