Here we report the first synthesis of two diastereomeric cationic octahedral Co(III) complexes based on commercially available (R,R)-1,2-diphenylethylenediamine and salicylaldehyde. Both diastereoisomers with opposite chiralities at the metal center (Λ and Δ configurations) were prepared. The new Co(III) complexes possessed both acidic hydrogen-bond donating (HBD) NH moieties and nucleophilic counteranions and operate as bifunctional chiral catalysts for the challenging kinetic resolution of terminal and disubstituted epoxides by the reaction with CO₂ under mild conditions. The highest selectivity factor (s) of 2.8 for the trans-chalcone epoxide was achieved at low catalyst loading (2 mol %) in chlorobenzene, which is the best achieved result currently for this type of substrate.

中文翻译：

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基于(R,R)-1,2-二苯基乙二胺的非对映阳离子手性钴配合物的合成及催化研究

在这里，我们报告了基于市售 ( R , R )-1,2-二苯基乙二胺和水杨醛的两种非对映体阳离子八面体 Co(III) 配合物的首次合成。制备了在金属中心具有相反手性的两种非对映异构体（Λ 和 Δ 构型）。新的 Co(III) 配合物同时具有酸性氢键供体 (HBD) NH 部分和亲核抗衡阴离子，并作为双功能手性催化剂通过在温和条件下与 CO ₂反应来解决具有挑战性的末端环氧化物和双取代环氧化物的动力学拆分。反式的最高选择性因子 ( s ) 为 2.8-查尔酮环氧化物是在氯苯中以低催化剂负载量（2 mol%）实现的，这是目前此类底物的最佳结果。