| abstract |
[PROBLEMS] To provide a stable metal complex capable of obtaining a homogeneous and high-purity product on an industrial scale by coordination polymerization of various monomers. SOLUTION: General formula I [M is Sc, Y, La or a lanthanide metal, R is hydrogen, Halogen, C 1 -C 20 represents alkyl, C 3 -C 10 cycloalkyl, C 6 -C 15 aryl or C 3 -C 30 silyl, two adjacent R is a saturated / unsaturated C4~18 ring Alternatively, a heterocyclic group may be formed, wherein R ′ and R ″ are C 1 to C 20 alkyl, C 3 -C 10 cycloalkyl, C 6 -C 15 aryl or C 1-10 of the alkyl moiety and C 6 -C of the aryl moiety Alkylaryl wherein L is a low molecular weight Lewis- A basic organic compound, m represents an integer of 0 to 4, and n represents 0 or 1. ] A semi-sandwich complex of unbridged mononuclear bisalkyl metal having polymerization activity. |