METHOD FOR PREPARING METALLIC CARBENE-BASED CATALYSTS FOR HYDROSILYLATION OF UNSATURATED COMPOUNDS AND RESULTING CATALYSTS

摘要

The invention concerns an improved method for preparing catalysts for hydrosilylation reactions of compounds with ethylene or acetylene unsaturation (for example olefins or acetylene derivatives), in particular but not exclusively those involving polyorganosiloxanes (POS) bearing Si-H units and POS bearing Si-(ethylene or acetylene unsaturation) units. Said preparation corresponds to the following synthesis (I), wherein: A = B = carbon; T1, T2 = cyclohexyl, t-butyl or methyl; T3, T4 = H; DVTMS = divinyltetramethylsiloxane; t-BuOK = potassium tert-butylate; T.A = room temperature. The invention is characterised in that it consists in carrying out said synthesis in a single step by bringing together salt (III) above, Karstedt (IV) in the presence of a solvent (V) (THF) and a base (VI) (t-BuOK) at room temperature.