Patent ID: 7208618

Claim:
A process for the continuous preparation of a silane of the formula I R 6 R 5 CH—R 4 CH—SiR 1 R 2 R 3 (I), which comprises continuously reacting a silane of the formula II HSiR 1 R 2 R 3 (II), with an alkene of the formula III R 6 R 5 C═CHR 4 (III), in the presence of an iridium compound of the formula IV as catalyst [(diene)IrCl] 2 (IV), and free diene as cocatalyst, where R 1 , R 2 , R 3 are each a monovalent Si—C-bonded, unsubstituted or halogen-substituted C 1 –C 18 -hydrocarbon radical, a chlorine atom or a C 1 –C 18 -alkoxy radical, R 4 , R 5 , R 6 are each a hydrogen atom, a monovalent C 1 –C 18 -hydrocarbon radical optionally bearing one or more F, Cl, OR, NR′ 2 , CN or NCO substituents, a chlorine atom, a fluorine atom or a C 1 –C 18 -alkoxy radical, where 2 radicals R 4 , R 5 , R 6 together with the carbon atoms to which they are bound may form a cyclic radical, R is a hydrogen atom or a monovalent C 1 –C 18 -hydrocarbon radical and diene is a C 4 –C 50 -hydrocarbon compound optionally bearing one or more F, Cl, OR, NR 2 , CN or NCO substituents and has at least two ethylenic C═C double bonds, with the reaction temperature being 30–200° C. and the reaction pressure being 0.11–50.0 Mpa, in a mol ratio of alkene (III) to silane (II) such that 0.01 to 100 mol % of (III) is present in excess over (II) when said catalyst is present.