New catalysts based on Yb(salen) complexes active for the copolymerization of cyclohexene oxide (CHO) and CO₂ to give poly(cyclohexene)carbonate (PCHC) are reported. In combination with cocatalytic, nucleophilic chloride additives these new (binary) catalysts provided good conversion and selectivity for PCHC formation with average turnover frequencies of up to 35 h^–1and narrow molecular weight distributions. The best results were obtained with the binary catalyst system 1 (0.1 mol %)/NBu