Patent ID: 7307178

Claim:
A process of preparing a γ,δ-unsaturated carboxylic acid silyl ester of the general formula (3), comprising the step of reacting an α,β-unsaturated carboxylic acid 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 , R 3 , R 4 , R 4′ , R 5 , R 6 and R 6′ are each independently a monovalent C 1 -C 20 hydrocarbon group which may be halo-substituted, a halogen atom, or a hydrogen atom, or a pair of R 1 and R 2 , R 1 and R 3 , R 4 and R 4′ , R 4 and R 6 , R 4′ and R 6 , or R 5 and R 6′ may bond together to form a ring, wherein R a , R b and R c are each independently selected from the class consisting of C 1 -C 20 alkyl, C 6 -C 20 aryl, C 7 -C 20 aralkyl, C 1 -C 20 alkoxy, C 6 -C 20 aryloxy, C 7 -C 20 aralkyloxy, organosiloxy groups in which a group bonded to a silicon atom is a monovalent C 1 -C 20 hydrocarbon group or hydrogen, substituted forms of the foregoing groups in which a hydrogen atom bonded to a carbon atom is substituted with a halogen atom, and halogen atoms, 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 bonded, 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 bonded, wherein R 1 , R 2 , R 3 , R 4 , R 4′ , R 5 , R 6 , R 6′ , R a , R b and R c are as defined in formulae (1) and (2).