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 ZnEt2 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 CO2 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 CO2 fractions of 0.424-0.476 (by 1H-NMR)and instrinsic viscosity [η] of 0.115～0.368 dL／g in chloroform at 30℃．