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Bu 3 Sn-endded poly(vinyl)s with biological activity were obtained by the radical polymerization of vinyl monomersusing thianthrene cation radical/ n Bu 3 H. Thianthrene cation and stannyl radicals promoted the homopolymerization andcopolymerization of styrene and ethyl vinyl ether having number average molecular weights of 2000-3100. Tributyltinhydride functions as a chain transfer agent. Such polymereization by cationic thianthrene and stannyl radicals could providesome clues for the biological reaction in living animals. Plausible polymerization mechanisms were suggested.Key words: Thianthrene, Cation Radical, Tribuyltin Hydride, Polymerization 1. Introduction Radical chemistry has received great attention due toits main role in various important organic reactions [1] .Nevertheless, little is known for the reactions withunsaturated alkenes and alkynes although cationic rad-icals are known to react with various nucleophiles [1] .The addition of cationic radicals such as R 2 NH

Radical Polymerization of Vinyl Monomers to Poly(vinyl)s havingnBu3Sn end Groups with Biological Activity

Radical Polymerization of Vinyl Monomers to Poly(vinyl)s havingⁿBu₃Sn end Groups with Biological Activity