Patent ID: 6960679

Claim:
A process for preparing a silyl ketene acetal of the general formula (3), comprising the step of reacting an α,β-unsaturated carboxylic ester of the general formula (1) with a hydrosilane or hydrosiloxane of the general formula (2) in the presence of a catalytic amount of tris(pentafluorophenyl)borane, wherein R 1 , R 2 and R 3 are each independently hydrogen or a substituted or unsubstituted monovalent hydrocarbon group of 1 to 60 carbon atoms, or a pair of R 1 and R 2 or R 1 and R 3 may bond together to form a ring of 3 to 20 carbon atoms with the carbon atom(s) to which they are attached, and R 4 is a substituted or unsubstituted monovalent hydrocarbon group of 1 to 40 carbon atoms or a substituted or unsubstituted silyl group of up to 60 carbon atoms and free of a SiH bond, wherein R a , R b and R c are independently selected from a substituted or unsubstituted monovalent hydrocarbon group of 1 to 20 carbon atoms, an organoxy group of 1 to 20 carbon atoms, an organo(poly)siloxy group of 1 to 1,000 silicon atoms, and a halogen atom, or a pair of R a and R b , R a and R c , or R b and R c may bond together to form a siloxane ring of 3 to 50 silicon atoms or a silicon-containing ring of 1 to 20 carbon atoms with the silicon atom to which they are attached, or R a , R b and R c may bond together to form a cage siloxane of 6 to 50 silicon atoms with the silicon atom to which they are attached, wherein R 1 , R 2 , R 3 , R 4 , R a , R b and R c are as defined in formulae (1) and (2).