Lanthanide mono(borohydride) complexes of diamide-diamine donor ligands:novel single site catalysts for the polymerisation of methyl methacrylate

摘要

Samarium chloride and borohydride complexes of the diamide-diamine ligands (2-C_5H_4N)CH_2N(CH_2CH_2NR)_2 (R=SiMe_3 or mesityl) are described;the borohydride compounds are the first polydentate amide-supported single component lanthanide catalysts for the controlled polymerisation of polar monomers,and also represent the first lanthanide borohydride complex for the polymerisation of methyl methacrylate.