Magnesium complexes containing bis-amido-oxazolinate ligands as efficient catalysts for ring opening polymerisation of l-lactide
作者:Ming-Tsz Chen、Ping-Jung Chang、Chi-An Huang、Kuo-Fu Peng、Chi-Tien Chen
DOI:10.1039/b907549f
日期:——
A series of magnesium bis(amido-oxazolinate) complexes have been described. Reactions of six amido-oxazolinate ligand precursors, HNC2MeOxa, HNC2OMeOxa, HNC2StBuOxa, HNPhOxa, HNPhOMeOxa or HNPhSMeOxa, with half molar equivalent of MgnBu2 in hexane yield the magnesium bis(amido-oxazolinate) complexes, (NC2EOxa)2Mg [C2E = propyl, (NC2MeOxa)2Mg (1); C2E = 2-methoxyethyl, (NC2OMeOxa)2Mg (2); C2E = 2-tert-butylthioethyl, (NC2StBuOxa)2Mg (3)], or magnesium bis(anilido-oxazolinate) complexes, (NArOxa)2Mg [Ar = phenyl, (NPhOxa)2Mg (4); Ar = 2-methoxyphenyl, (NPhOMeOxa)2Mg (5); Ar = 2-methylthiophenyl, (NPhSMeOxa)2Mg (6)], respectively. The molecular structures are reported for compounds 1, 2, 5 and 6. Their catalytic activities toward the ring opening polymerisation of L-lactide in the presence of benzyl alcohol are also under investigation.
介绍了一系列双(氨基恶唑酸)镁络合物。六种氨基偶氮唑配体前体(HNC2MeOxa、HNC2OMeOxa、HNC2StBuOxa、HNPhOxa、HNPhOMeOxa 或 HNPhSMeOxa)与半摩尔当量的 MgnBu2 在己烷中发生反应,生成双(氨基偶氮唑)镁络合物、与一半摩尔当量的 MgnBu2 在正己烷中反应生成双(氨基恶唑酸)镁络合物 (NC2EOxa)2Mg [C2E = 丙基,(NC2MeOxa)2Mg (1);C2E = 2-甲氧基乙基,(NC2OMeOxa)2Mg (2);C2E = 2-叔丁基硫代乙基,(NC2StBuOxa)2Mg (3)],或双苯胺基恶唑酸镁络合物 (NArOxa)2Mg [Ar = 苯基,(NPhOxa)2Mg (4);Ar = 2-甲氧基苯基,(NPhOMeOxa)2Mg (5);Ar = 2-甲硫基苯基,(NPhSMeOxa)2Mg (6)]。报告了化合物 1、2、5 和 6 的分子结构。此外,还在研究它们在苯甲醇存在下对 L-内酰胺开环聚合反应的催化活性。