| abstract |
PROBLEM TO BE SOLVED: To provide an inexpensive method for producing a polymer of an unsaturated carboxylic acid and a derivative thereof by radical polymerization, wherein the stereoregularity of the obtained polymer can be effectively controlled. . A following general formula (I) M III X 3 ( I) ( wherein, M III is a central metal selected scandium, yttrium, and lanthanide metal, X Represents a halogen atom or trifluoromethanesulfonic acid) or an unsaturated carboxylic acid or a derivative thereof in the presence of a metal Lewis acid represented by the general formula (II) HfY 4 (II) (wherein Y represents a halogen atom) Is subjected to radical polymerization using as a monomer. |