Patent ID: 8716511

Claim:
A process for preparing organoalkoxyhydrosilanes with a boron content less than 100 ppb and of the formula R 1 x H y Si(OR 2 ) z wherein x+y+z=4 and x, y, z are greater than or equal to 1, wherein, in a first step, a boron-contaminated organohalohydrosilane of the formula R 1 x H y SiHal z wherein x+y+z=4, x, y, z are greater than or equal to 1, and R 1 are linear or branched alkyl, cycloalkyl, aryl, alkenyl or arylalkyl radicals having 1 to 12 carbon atoms and Hal is F, Cl, Br or I, is subjected to a treatment with silica or aluminosilicate and the silica or the aluminosilicate is subsequently removed from the organohalohydrosilane in a second step and then the purified organohalohydrosilane is reacted with an alcohol R 2 —OH wherein R 2 is a methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, n-pentyl, isopentyl, neopentyl or tert-pentyl radical.