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C 3 ‐Symmetric Lanthanide Tris(alkoxide) Complexes Formed by Preferential Complexation and Their Stereoselective Polymerization of rac ‐Lactide
Author(s) -
Arnold Polly L.,
Buffet JeanCharles,
Blaudeck Robert P.,
Sujecki Slawomir,
Blake Alexander J.,
Wilson Claire
Publication year - 2008
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.200801279
Subject(s) - alkoxide , lactide , stereoselectivity , diastereomer , tacticity , ligand (biochemistry) , chemistry , polymerization , tris , polymer chemistry , stereochemistry , catalysis , organic chemistry , polymer , receptor , biochemistry
Restoring order : Y III , Eu III , and Er III tris(ligand) complexes of a new chiral alkoxide ligand, t Bu 2 P(O)CH 2 CH( t Bu)OH (HL), preferentially form as C 3 ‐symmetric diastereomers. Thus racemic HL affords ( RRR ) ‐ and ( SSS )‐[LnL 3 ] complexes, which are active catalysts for the stereoselective polymerization of rac ‐lactide to afford highly isotactic polylactic acid.