负载Pd(Ⅱ)两亲性纳米催化剂的制备及其在水中循环催化C-C耦合反应

Preparation of amphiphilic nanocatalyst-supported Pd(Ⅱ)and its application in C-C coupling reaction in water

合成在水相反应中具有高活性、易分离、能重复使用的催化剂具有重要的研究意义。我们首先通过部分离子交换的方式,合成了同时具有亲疏水阴离子、具有两亲性的聚离子液体共聚物。该共聚物中咪唑基团提供卡宾配体,进一步与Pd(OAc)2通过络合作用形成稳定的聚合物交联网络,将金属催化剂稳定地固定在网络内部,形成固载Pd(OAc)2的纳米催化剂。该催化剂具有两亲性,有助于在水相中富集反应底物,有效催化水中Suzuki耦合反应。更为重要的是,该催化剂具有良好的催化稳定性,循环使用10次,其催化活性没有明显降低。这种基于聚离子液体固载催化剂的合成方法为环境友好型催化剂的设计和水中绿色反应的发展提供了重要的途径。

The synthesis of catalysts with high activity,easy separation and reusability in aqueous phase reaction is of great significance.Firstly,a series of polyionic liquid copolymers with hydrophilic and hydrophobic anions were synthesized by partial ion exchange,which shows amphiphilic.The imidazole group in the copolymer provides carbene ligands,and further forms a stable cross-linked polymer network through complexation with Pd(OAc)2.The metal catalyst is stably fixed in the network to form a Pd(OAc)2 supported nanocatalyst.The catalyst was amphiphilic,which is helpful to enrich the reaction substrate in water and effectively catalyze the Suzuki coupling reaction.In addition,the catalyst is stable and circulates for 10 times,and its catalytic activity is not significantly reduced.This synthesis method of solid-supported catalyst based on polyionic liquid provides an important way for the design of environmentally friendly catalyst and the development of green reaction in water.