Heterobimetallic Samarium(III) and Titanium(IV) Complexes with Bifunctional Catalytic Properties

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• 作者：Fengying Zhou ; Miaoshui Lin ; Lei Li ; Xueqing Zhang ; Zhou Chen ; Yahong Li ; Yang Zhao ; Jin Wu ; Guimin Qian ; Bin Hu ; Wu Li
• 刊名：Organometallics
• 出版年：2011
• 出版时间：March 28, 2011
• 年：2011
• 卷：30
• 期：6
• 页码：1283-1286
• 全文大小：760K
• 年卷期：v.30,no.6(March 28, 2011)
• ISSN：1520-6041

文摘

Reaction of the bis-ligand-chelated samarium complex [Sm(Hbptd)(H₂bptd)] (1; H₃bptd =1,9-bis(2-pyrrolyl)-2,5,8-triazanona-1,8-diene), in which a pyrrolyl ring is dangling and metal-free, with Ti(NMe₂)₄ yielded the heterometallic complex [Sm(Hbptd)(THF)(bptd)Ti(NMe₂)₂] (2). Treatment of the H₃bptd ligand with 1 equiv of Ti(NMe₂)₄ gave the titanium amido complex [Ti(bptd)(NMe₂)] (3). Complexes 2 and 3 were able to catalyze the hydroamination of phenylacetylene with 2,4-dichloroaniline and 4-methoxyaniline, and high regioselectivities were observed for the two amines. Both 1 and 2 were active catalysts for the ring-opening polymerization of 蔚-caprolactone. 2 showed higher activity for the polymerization reactions, due to a decrease in the coordination number of the samarium atom (from 9 in 1 to 8 in 2) by sharing its ligand with the titanium center.