Synthesis and Cyclohexene Oxide/Carbon Dioxide Copolymerizations of Zinc Acetate Complexes Bearing Bidentate Pyridine-Alkoxide Ligands

✍ Scribed by Il Kim; Sang Mook Kim; Chang-Sik Ha; Dae-Won Park

• Book ID: 102493333
• Publisher: John Wiley and Sons
• Year: 2004
• Tongue: English
• Weight: 131 KB
• Volume: 25
• Category: Article
• ISSN: 1022-1336
• DOI: 10.1002/marc.200300287

✦ Synopsis

Abstract

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.

imageThe monoligated Zn complexes synthesized and used here as catalysts for the copolymerization of cyclohexene oxide and carbon dioxide.