Two catalyst precursors—DPB ( N,N′ diphenyl 2,3 butadiimine) and PDP ( N phenyl 2,5 dimethyl pyrrole) were synthesized by reactions of diketones and aniline in alcohol. N,N′ diphenyl 2,3 butadiimine and N phenyl 2,5 dimethyl pyrrole were characterized by IR, 1H NMR and MS, and were found to have diimine and substituted pyrrole ring structure, respectively. The condensates N,N′ diphenyl 2,3 butadiimine and N phenyl 2,5 dimethyl pyrrole both were treated with ZnEt-2 and then with methnol, resulting in Zn complexes with the diketone|aniline condensates (DPBZn and PDPZn). The two complexes were applied as catalysts for the copolymerization of CO 2 and cyclohexene oxide. One mole of DPBZn and DPDZn may generate 3000 and 16800 g of polymers, respectively. The obtained copolymers were also determined to have CO 2 fractions of 0 424～0 476 (by 1H NMR) and instrinsic viscosity [ η] of 0 115～0 368?dL/g in chloroform at 30℃.
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