화학공학소재연구정보센터
Macromolecular Rapid Communications, Vol.25, No.8, 888-893, 2004
Synthesis and cyclohexene oxide/carbon dioxide copolymerizations of zinc acetate complexes bearing bidentate pyridine-alkoxide ligands
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-py-CAr2O)Zn(OAc) showed moderate yield and CO2 incorporation. The [6-Me-pyC((4)-Cl-C6H4)(2)O]Zn(OAc) complex gave large polymers with high proportions of carbonate link age (>60%) and narrow polydispersity, indicating single active sites.