Chiral Amido-Oxazolinate Zinc Complexes for Asymmetric Alternating Copolymerization of CO<sub>2</sub> and Cyclohexene Oxide
作者:Srinivas Abbina、Guodong Du
DOI:10.1021/om3006992
日期:2012.11.12
PhCO, R2 = (S)-iPr) exists as an amide oxygen-bridged dimer in the solid state with zinc in a distorted tetrahedral geometry. These complexes are viable initiators for alternating copolymerization of carbon dioxide (CO2) and cyclohexene oxide (CHO), yielding poly(cyclohexene carbonate) (PCHC) with good to high carbonate linkage and moderate molecular weights and PDI values, depending on the substituents
一系列手性锌络合物的合成和表征(大号1A -米)ZNN(森达3)2(2A -米用)Ç 1 -对称酰氨基oxazolinate配体(HL 1A -米= 2-(2'--R已经描述了1 NH)苯基-4-R 2-恶唑啉。单晶X射线晶体学研究证实2a(R 1 = 2,6-二甲基苯基,R 2 =(S)-i Pr)和2d(R 1= 2,6-二甲基苯基,R 2=(R)-i Bu)是三配位的单核络合物,并且2k(R 1= PhCO,R 2=(S)-i Pr)作为酰胺氧桥存在。固态的二聚体,以及扭曲的四面体几何形状的锌。这些配合物是用于二氧化碳(CO 2)和环己烯氧化物(CHO)交替共聚,产生具有良好或高碳酸酯键以及适中分子量和PDI值的聚(环己烯碳酸酯)(PCHC)的可行引发剂,具体取决于取代基。产生的PCHCs通常全同立构,含有高达72%米通过-centered四分2H(R 1 = 2,6-二异丙基,R 2