Process for preparing alkoxysilane cluster compounds by reacting a trialkoxysilanol with an amidated alkoxysilane cluster compound

Described is a process for producing alkoxysilane cluster compounds by reacting a trialkoxysilanol with an amidated alkoxysilane cluster compound; this reaction being based on the following equation: +TR RSi[OSi(OR')3]3 + HNR''R''' wherein R is hydrogen, an alkyl, an alkenyl, an aryl, or an aralkyl; each R' is independently selected from the same groups as R with the proviso that at least a majority of said R' radicals are sterically hindered alkyl groups having at least 3 carbon atoms; and R'' and R''' are individually selected from hydrogen, lower alkyl groups having 1-4 carbon atoms, and phenyl.