!!Synthesis of Organoarsenic Polymers
Novel organoarsenic polymers, poly(vinylene-arsine)s, were synthesized by a free-radical alternating copolymerization of acetylenes with cyclooligoarsines as an atomic biradical equivalent. This is the first example of the well-defined organoarsenic polymer having an As atom alternatively.

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Fig. 1

!!Controlled Polymerization of Amino-Acid Esters by Copper (II) Chelate
We are investigating a novel method of polymerization, via the insertion of activated amino-acid esters into copper (II) chelate. In the presence of catalytic amount of copper (II) chelate, well-controlled condensation product of amino-acid was obtained.

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Fig. 2