The synthesis and characterization of novel PNP carbazolyl ligated yttrium bis(aminobenzyl) complex 1 and the CCC-pincer bis(NHC) dysprosium dibromides 2 have been reported. The binary system of 1/[Ph3C][B(C6F5)4] and the ternary system of 2/AlR3/[Ph3C][B(C6F5)4] exhibited excellent cis-1,4 selective polymerization of dienes, and strikingly the former could initiate further the polymerization of e-caprolactone to afford the unprecedented high cis-1,4 regulated block copolymer PIP-b- PCL.

Highly stereoselective homo- and co-polymerizations of dienes initiated by rare-earth metal complexes

239th National Meeting (2010)

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