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CuI and CuII Salts of Group VIA Elements as Catalysts for Living Radical Polymerization Initiated with Sulfonyl Chlorides - Published online 5 September 2000 - A new class of nonacidic Cu2Y/Bpy and CuY/Bpy catalysts (where Y is O, S, Se, or Te and Bpy is 2,2'-bipyridine) for the living radical polymerization of vinylic monomers initiated from sulfonyl halides is described. A polymerization mechanism based on the in situ generation of the CuCl/CuCl2 pair is suggested. The experimental rate constants of polymerization were higher for the Cu2Y-based catalysts and increased for both the Cu2Y and CuY catalysts in the order Y = O < S < Se < Te./
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