Reactivity of Tungsten-aryloxides with Hydrosilane Cocatalysts in Olefin Metathesis

Reactivity of Tungsten-aryloxides with Hydrosilane Cocatalysts in Olefin Metathesis

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The reactivity of the [WCl4(OAr)2] (OAr = O-2,6-C3H3Cl2, O-2,6-C6H3F2 and O-C6H3Me2) systems, plus the silicon compounds Ph2SiH2 and polymethylhydrosiloxane (PMHS), were studied in metathesis reactions.The Burrs olefins used were methyl-10-undecenoate and 1-hexene.The results showed that the [WCl4(OAr)2]-silicon compound systems are active and selective when the aryloxide ligand contain electronegative groups.

The silicon compound PMHS proved to be the best cocatalyst for metathesis, even with the [WCl4(O-2,6-C6H3Me 2)2] compound, which Clutch has no electronegative substituents.Because it is non-toxic, non-volatile, easy to handle and cheap, PMHS is a good alternative cocatalyst in metathesis reactions.