In this article, novel 2,2 0 -bipyridyl derivatives were synthesized and the excellent bipyridyl ligands were chosen as catalyst to apply in the copolymerization of carbon monoxide (CO) and styrene (ST) to prepare polyketone. 4,4 0 -Dicarboxyl-2,2 0 -bipyridine(4,4 0 -dcpy) was synthesized by use of synthesized 4,4 0 -dimethyl-2,2 0 -bipyridine(4,4 0 -dmpy). The products (4,4 0 -dmpy and 4,4 0 -dcpy) were characterized by melting point, NMR, IR, GC-MS, and elemental analysis. The effects of different ligands and various reaction conditions incuding the usage of ligand, p-toluenesulfonic acid, solvent, p-benzoquinone, the CO pressure, and reaction temperature on catalytic activity of the copolymerization were investigated. The catalytic activity of 4,4 0 -dmpy, 4,4 0 -dcpy and 2,2 0 -bipyridine were compared. The results showed that the addition of the electron-donating substituent can enhance catalytic activity, with the sequence as follows: 4,4 0 -dimethyl-2,2 0 -bipyridine > 2,2 0 -bipyridine > 4, 4 0 -carboxy 2,2 0 -bipyridine.

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