Abstract
Ru(Cp*)Cl(PPh3)2 (Cp* = pentamethylcyclopentadienyl; PPh3 = triphenylphosphine) has been found to be a versatile catalyst that is applicable to living radical polymerization of methyl methacrylate (MMA), methyl acrylate (MA), and styrene (St) with Al(Oi-Pr)3 as an additive. The number-average molecular weights (Mn) of the obtained polymers increased in proportion to monomer conversion, and the molecular weight distributions were very narrow (Mw/Mn < 1.1). Effective initiators were all alkyl halides (R−X), where X = Cl for MMA; Cl and Br for St; and Cl, Br, and I for MA. Ru(Cp*)Cl(PCy3) (Cy = cyclohexyl) also proved an effective catalyst for living radical polymerization of MMA, faster than that with Ru(Cp*)Cl(PPh3)2, to produce polymers with narrow molecular weight distributions (Mw/Mn < 1.2).
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