USE OF SELECTED METAL CATALYSTS FOR RING-OPENING POLYMERIZATION OF EPOXIDES

摘要

PROBLEM TO BE SOLVED: To produce a metal catalyst for ring-opening polymerization of a heterocyclic compound which gives a ring-opening polymerizate of which more than 75% of terminal heteroatom groups are primary.;SOLUTION: This metal catalyst comprises ligands and a metal atom, and its smallest maximal angle (Dm) among all the maximal angles (D) defined below is 60° or lower. In a metal catalyst comprising ligands and a metal atom, the maximal angle (D) means the maximal angle formable by an imaginary straight line (Y) passing through the center of a non-coordinated atom in coordination and the center of the metal atom (M) with an imaginary straight line (X) which passes through the center of the metal atom and crosses at right angles with an imaginary plane (P) passing through the centers of three coordinated atoms among coordinated atoms which are not substituted with a reaction substrate (S) and are directly bonded to the metal atom (M). The number of the maximal angles (D) present is the same as that of non-coordinated atoms.;COPYRIGHT: (C)2002,JPO