Catalytic Property For Suzuki Reaction Of Polyvinyl Chloride Polyethylene Polyamine Supported Palladium Complex

Recently, all kinds of C-C coupling reaction catalyzed by palladium had been attended to extensively in organic synthesis. The palladium catalyzed Suzuki reaction(the coupling reaction of organoboronic acid, borate and ether organoborate with organic electronophilic agents, such as aryl halide and aryl triflate) is one of the most representative C-C coupling reaction, which is one of the most useful tool to form aryl-aryl bond. Compared with other aryl-aryl coupling reaction, the key advantages of Suzuki coupling reaction were the mild reaction conditions, toleratnce a variety of functional groups, water stablility, insignificant effect toward steric hindrance, high regio- and stereoselectivity, high yield and the commercial availability of the diverse boronic acids that are stable, non-toxic and environmentally safe. In addition, the handling and removal of boron-containing byproducts was easy, compared with other organometallic reagents, especially in a large-scale synthesis. So Suzuki reaction was used widely to synthesize natural products, pharmaceutics and herbicide, conduct polymers, liquid crystal materials, luminescence materials et al. Traditional catalysts for Suzuki reaction were main homogenous catalysts, such as Pd(PPh3)4, Pd(OAc)2 and PdCl2 et al. Despite of the these catalysts were high catalytic activity, palladium black was formed easily during the reaction process, wich was difficult to separate from the reaction mixture and to recycle and to reuse, which result in the preparation cost increases, on the other hand, the residual noble metal could contaminate products. All of this had restricted the Suzuki reaction in industrial application. The support catalysts, which could overcome the above-mentioned shortcoming of the homogenous catalysts, had high catalytic activity and had rapid development. Of which the polymer supported catalysts had been the hot research topics because of their high catalytic activity, regioselectivity, good heat stable and recycled property.