Liquid/solid phase transfer activation of Grubbs-type alkene metathesis catalysts; application of silver salts of sulfonated polystyrene
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© 2014 the Partner Organisations. Alkene metatheses catalyzed by (H2IMes)(Cy2PCH2CH2N(CH3)3+)(Cl)2Ru(CHPh) Cl-, an analog of Grubbs' second generation catalyst with an ammonium-salt containing phosphine, are dramatically accelerated when conducted in the presence of the insoluble resin PS-SO3Ag (PS = polystyrene). A mechanism involving ionic and covalent phosphine binding (PS-SO3Ag·PCy2CH2CH2N(CH3)3+ PS-SO3-) with concomitant formation of AgCl is proposed. Grubbs' second generation catalyst exhibits a modest rate enhancement, believed to reflect the generation of PS-SO3Ag·PCy3.
author list (cited authors)
Xi, Z., Bazzi, H. S., & Gladysz, J. A.