Closer to the "ideal recoverable catalyst" for atom transfer radical polymerization using a molecular non-fluorous thermomorphic system

被引:52
作者
Barré, G
Taton, D
Lastcouères, D
Vincent, JM
机构
[1] Univ Bordeaux 1, CNRS, UMR 5802, Chim Organ & Organomet Lab, F-33405 Talence, France
[2] Lab Chim Polymeres Organ, F-33607 Talence, France
关键词
D O I
10.1021/ja048096a
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The tetramine ligand 1 hexasubstituted by very long alkyl chains (C18H37) exhibits an exceptionally large temperature-dependent solubility in 1,4-dioxane, its solubility increasing ca. ∼104-fold between 23 and 50 °C. The preformed copper(I) complex CuBr/1 was shown to catalyze the atom transfer radical polymerization of methyl methacrylate with good control of the molar masses and polydispersities. Due to the thermoresponsive character of CuBr/1 polymerizations were carried out in homogeneous conditions while lowering the temperature to 10 °C led to the precipitation of the catalyst. Catalyst recovery was achieved with high yield (∼95%) by a simple filtration under noninert atmosphere. Very low residual copper contamination (∼200 ppm) was measured in the final polymer. The catalyst was recycled two times without significant loss of activity. Copyright © 2004 American Chemical Society.
引用
收藏
页码:7764 / 7765
页数:2
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