Tetra-nitrogenated Zn-Schiff-base complexes have been synthetized and studied by X-ray diffraction. The prepared Zn-N₄-ligands complexes could not follow the 18-electron rule. This property has allowed the complexes to be efficient in the coordination and activation of the substrates. The zinc complex of N,N’-bis(2-p-tosylaminobenzylidene)-1,2-diaminecyclohexane, Zn(Cy-Ts) combined to tetra-butylammonium iodide (TBAI) in a ratio of 1:1, or to triethylamine, catalyzed efficiently the CO₂/epoxides coupling. These catalytic reactions were carried out without solvent at 120 °C under CO₂ pressure. Cyclic carbonates were selectively obtained with high yield up to 99% (TON up to 4900). Two plausible pathways of CO₂/epoxide coupling mechanism were proposed without halide intervention, where both reactants are activated by the same Zn metal center.

通过X射线衍射合成和研究了四氮化的Zn-Schiff碱配合物。制备的Zn-N _4-配体配合物不能遵循18电子规则。该性质使得配合物在底物的配位和活化中是有效的。N，N'-双（2-对甲苯磺酰基氨基亚苄基）-1,2-二胺环己烷的锌络合物Zn（Cy-Ts）与碘化四丁铵（TBAI）或与三乙胺的锌络合物，有效地催化了CO ₂ /环氧化物的偶联。这些催化反应在没有溶剂的情况下在CO ₂压力下于120°C进行。有选择地以高达99％的高收率（TON高达4900）获得环状碳酸酯。CO _2的两个可能途径提出了在没有卤化物干预的情况下β-环氧化物的偶联机理，其中两种反应物都被相同的锌金属中心活化。