A method for preparing a product comprising: 1) combining A) a boron containing Lewis acid, B) an alkoxysilyl terminated polydiorganosiloxane of formula: where each subscript x is independently 1, 2, or 3; each subscript x' is independently 1, 2, or 3; a quantity (x + x') = 2 to 6; each subscript w is independently 1 to 10; each subscript n is 1 to 2,000; each R is an independently selected monovalent hydrocarbon group; each R 1 is independently selected from the group consisting of monovalent hydrocarbon groups and monovalent halogenated hydrocarbon groups; each R 2 is an independently selected alkyl group of 1 to 6 carbon atoms; each R 3 is independently selected from the group consisting of monovalent hydrocarbon groups and monovalent halogenated hydrocarbon groups; each R D is a divalent hydrocarbon group; each R D1 is independently selected from the group consisting of an oxygen atom and a divalent hydrocarbon group; and C) a branched organohydrogensiloxane of formula: where each subscript d is independently 0 to 995 and each R 24 is an independently selected monovalent hydrocarbon group; thereby preparing the product, where the product comprises a polyfunctional organohydrogensiloxane and a byproduct comprising HR 2 . A) a boron containing Lewis acid, B) an alkoxysilyl terminated polydiorganosiloxane of formula: where each subscript x is independently 1, 2, or 3; each subscript x' is independently 1, 2, or 3; a quantity (x + x') = 2 to 6; each subscript w is independently 1 to 10; each subscript n is 1 to 2,000; each R is an independently selected monovalent hydrocarbon group; each R 1 is independently selected from the group consisting of monovalent hydrocarbon groups and monovalent halogenated hydrocarbon groups; each R 2 is an independently selected alkyl group of 1 to 6 carbon atoms; each R 3 is independently selected from the group consisting of monovalent hydrocarbon groups and monovalent halogenated hydrocarbon groups; each R D is a divalent hydrocarbon group; each R D1 is independently selected from the group consisting of an oxygen atom and a divalent hydrocarbon group; and where each subscript x is independently 1, 2, or 3; each subscript x' is independently 1, 2, or 3; a quantity (x + x') = 2 to 6; each subscript w is independently 1 to 10; each subscript n is 1 to 2,000; each R is an independently selected monovalent hydrocarbon group; each R 1 is independently selected from the group consisting of monovalent hydrocarbon groups and monovalent halogenated hydrocarbon groups; each R 2 is an independently selected alkyl group of 1 to 6 carbon atoms; each R 3 is independently selected from the group consisting of monovalent hydrocarbon groups and monovalent halogenated hydrocarbon groups; each R D is a divalent hydrocarbon group; each R D1 is independently selected from the group consisting of an oxygen atom and a divalent hydrocarbon group; and C) a branched organohydrogensiloxane of formula: where each subscript d is independently 0 to 995 and each R 24 is an independently selected monovalent hydrocarbon group; thereby preparing the product, where the product comprises a polyfunctional organohydrogensiloxane and a byproduct comprising HR 2 . <EOS>