Premium
Synthesis and Cyclohexene Oxide/Carbon Dioxide Copolymerizations of Zinc Acetate Complexes Bearing Bidentate Pyridine‐Alkoxide Ligands
Author(s) -
Kim Il,
Kim Sang Mook,
Ha ChangSik,
Park DaeWon
Publication year - 2004
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.200300287
Subject(s) - cyclohexene oxide , chemistry , zinc , pyridine , catalysis , polymer chemistry , cyclohexene , alkoxide , propylene oxide , denticity , inorganic chemistry , copolymer , organic chemistry , polymer , ethylene oxide , crystal structure
Summary: The reaction of 2‐lithio‐6‐methylpyridine or 2‐lithiopyridine and the appropriate diaryl ketone followed by hydrolysis yields 6‐Me‐pyCAr 2 OH pyridine alcohols or pyCAr 2 OH pyridine alcohols. The reactions of zinc acetate with 1 equiv. of the lithiated products of the ligands proceed rapidly to afford LiOAc salt and mono‐ligand complexes (6‐Me‐pyCAr 2 O)Zn(OAc) and (pyCAr 2 O)Zn(OAc), respectively, in high yield. The copolymerizations of carbon dioxide with cyclohexene oxide were investigated. The (6‐Me‐pyCAr 2 O)Zn(OAc) showed moderate yield and CO 2 incorporation. The [6‐Me‐pyC(4‐Cl‐C 6 H 4 ) 2 O]Zn(OAc) complex gave large polymers with high proportions of carbonate linkage (>60%) and narrow polydispersity, indicating single active sites.The monoligated Zn complexes synthesized and used here as catalysts for the copolymerization of cyclohexene oxide and carbon dioxide.