10.1021/om1010935.s001
Fengying Zhou
Fengying
Zhou
Miaoshui Lin
Miaoshui
Lin
Lei Li
Lei
Li
Xueqing Zhang
Xueqing
Zhang
Zhou Chen
Zhou
Chen
Yahong Li
Yahong
Li
Yang Zhao
Yang
Zhao
Jin Wu
Jin
Wu
Guimin Qian
Guimin
Qian
Bin Hu
Bin
Hu
Wu Li
Wu
Li
Heterobimetallic Samarium(III) and Titanium(IV) Complexes with Bifunctional Catalytic Properties
American Chemical Society
2011
titanium amido
Ti
samarium atom
pyrrolyl ring
Bifunctional Catalytic PropertiesReaction
polymerization reactions
H 3bptd ligand
titanium center
Sm
1 equiv
Complexe
coordination number
2011-03-28 00:00:00
Journal contribution
https://acs.figshare.com/articles/journal_contribution/Heterobimetallic_Samarium_III_and_Titanium_IV_Complexes_with_Bifunctional_Catalytic_Properties/2676862
Reaction of the bis-ligand-chelated samarium complex [Sm(Hbptd)(H<sub>2</sub>bptd)] (<b>1</b>; H<sub>3</sub>bptd =1,9-bis(2-pyrrolyl)-2,5,8-triazanona-1,8-diene), in which a pyrrolyl ring is dangling and metal-free, with Ti(NMe<sub>2</sub>)<sub>4</sub> yielded the heterometallic complex [Sm(Hbptd)(THF)(bptd)Ti(NMe<sub>2</sub>)<sub>2</sub>] (<b>2</b>). Treatment of the H<sub>3</sub>bptd ligand with 1 equiv of Ti(NMe<sub>2</sub>)<sub>4</sub> gave the titanium amido complex [Ti(bptd)(NMe<sub>2</sub>)] (<b>3</b>). Complexes <b>2</b> and <b>3</b> 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 <b>1</b> and <b>2</b> were active catalysts for the ring-opening polymerization of ε-caprolactone. <b>2</b> showed higher activity for the polymerization reactions, due to a decrease in the coordination number of the samarium atom (from 9 in <b>1</b> to 8 in <b>2</b>) by sharing its ligand with the titanium center.