Patent ID: 6984747
Filing Date: 2006-01-10
Classification: C07F

Abstract:
1. Method for preparing silanes comprising styryl groups, said silanes being represented by the general formula (I) wherein the radicals and indices have the following meaning: St represents a styryl group which is unsubstituted or substituted by a radical containing at least one carbon atom which is bonded to the styryl group via one of its carbon atoms, R is a group attached to the silicon atom via a carbon atom, R′ is an unsubstituted or substituted C a means 0, 1, 2 or 3 and b means 1, 2 or 3, comprising the following steps: (a) reacting a compound represented by the formula StX, wherein St is defined as above and X is a halogen that is attached to a phenyl ring of said styryl group with magnesium in a solvent mixture consisting of or substantially comprising diethyl ether and tetrahydrofuran in a ratio of from 30:70 to 70:30 (v/v) at a reaction temperature which does not exceed the boiling temperature of the mixture at ambient pressure to form a Grignard reagent, and (b) subsequently, reacting the Grignard reagent formed by step (a) with a silane of the formula (II) wherein the radicals and indices have the same meaning as indicated for formula (I), at a maximum temperature of 20° C. in a solvent mixture substantially consisting of diethyl ether and tetrahydrofuran.