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首页> 外文期刊>RSC Advances >Combining RAFT precipitation polymerization and surface-initiated RAFT polymerization: an efficient approach to prepare hairy particles-supported proline
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Combining RAFT precipitation polymerization and surface-initiated RAFT polymerization: an efficient approach to prepare hairy particles-supported proline

机译：将RAFT沉淀聚合与表面引发的RAFT聚合相结合：制备毛状颗粒负载脯氨酸的有效方法

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In this paper, a simple and efficient approach for obtaining hairy particles supported proline system is described. The catalysts were synthesized by the modification of polymer microspheres via surface-initiated RAFT polymerization. Microspheres containing either carboxyl or ester groups were synthesized by RAFT precipitation copolymerization, and the functional groups influenced the yield and asymmetric selectivity of chiral product in different DMF-H2O solvents during a representative aldol reaction. Compared with hairy particles 2 with ester groups, hairy particles 1 with carboxyl groups exhibited better catalytic activity and asymmetric selectivity, providing more suitable microenvironments for the aldol reaction. Importantly, the hairy particles 1, as catalyst, can be easily recovered and recycled, and show no significant loss of activity and selectivity after 6 cycles. The application of RAFT precipitation polymerization together with the facile surface-grafting approach provides a general and promising way for chiral catalyst load.
机译：在本文中，描述了一种获得毛状颗粒支持的脯氨酸系统的简单有效的方法。催化剂是通过表面引发的RAFT聚合反应对聚合物微球进行改性而合成的。通过RAFT沉淀共聚反应合成了含有羧基或酯基的微球，官能团影响在不同的DMF-H2O溶剂中手性产物的收率和不对称选择性。与具有酯基的毛状颗粒2相比，具有羧基的毛状颗粒1表现出更好的催化活性和不对称选择性，为醛醇缩合反应提供了更合适的微环境。重要的是，作为催化剂的毛状颗粒1可以容易地回收和再循环，并且在6个循环后没有显示出明显的活性和选择性损失。 RAFT沉淀聚合的应用以及简便的表面接枝方法为手性催化剂负载提供了一种通用且有希望的方法。

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