A new family of [ONSN]-type chromium complexes bearing hybrid coordination site (O, N, S) have been developed for the coupling of epoxides with CO₂. The catalytic system resulting from the complex C2 in combination with TBAB shows the high activity for the cycloaddition of epoxides with CO₂ with a broad range of substrates including terminal epoxides and internal epoxides. When catalytic system is switched from complex C2 and TBAB to complex C3 and PPNCl as well as regulation of the reaction conditions, which causes the variation of chemo-selectivity and allows the highly selective synthesis of poly(cyclohexene carbonate) by employing cyclohexene oxide as substrate. The spectroscopic analysis, including UV–vis, FT-IR, and ESIMS, pointed to the formation of new chromium complex, which may be an active species in the reaction.

已经开发了一种新的[ONSN] 型铬配合物，它们带有杂化配位点（O、N、S），用于环氧化物与CO ₂的偶联。由络合物C2与 TBAB 组合得到的催化体系显示出对环氧化物与 CO ₂的环加成的高活性，包括末端环氧化物和内部环氧化物在内的广泛底物。当催化系统从络合物C2和 TBAB 切换到络合物C3时和PPNCl以及反应条件的调节，导致化学选择性的变化，并允许以氧化环己烯为底物高选择性地合成聚（环己烯碳酸酯）。光谱分析，包括 UV-vis、FT-IR 和 ESIMS，表明形成了新的铬络合物，这可能是反应中的活性物质。