In this study, the novel neutral cobaloximes and corresponding to different cobaloxime-based double complex salts were prepared and for the first time evaluated as an efficient catalyst for the synthesis of cyclic carbonates from epoxides and CO₂ without using any organic and inorganic solvents. After seeing the efficient catalytic performance of different forms of the newly synthesized neutral cobaloximes (1−3) and different cobaloxime (4−9) salts, the effect of epoxide, base, temperature, CO₂ pressure, reaction time, and amount of catalyst was investigated for these catalysts. The neutral cobaloximes (1−3), double cobaloxime salts (4−6), and their single salts with simple counterions (7−9) were characterized by ¹H and ¹³C NMR spectra, FT-IR spectra, UV-Vis spectra, LC-MS/MS spectrometers, melting point, and elemental analysis techniques. Furthermore, the compounds were utilized as catalysts in the synthesis of cyclic carbonates from epoxide and CO₂. The neutral cobaloximes (1−3), double cobaloxime salts (4−6), and their single salts with simple counterions (7−9) showed high catalytic activity (at 100 °C and 1.6 MPa of CO₂ pressure) for the carboxylation of epichlorohydrin. The best conversion was performed in the presence of a catalyst (6) (the double cobaloxime salt bearing ethyl) and DMAP as co-catalyst, with a 97.9% yield and 98.4% selectivities.

在这项研究中，制备了新型中性钴肟和对应于不同的钴肟基复配盐，并首次在不使用任何有机和无机溶剂的情况下，将其作为由环氧化物和 CO _{2合成环状碳酸酯的有效催化剂进行了评估。}在看到新合成的中性钴肟（1-3）和不同钴肟（4-9）盐的不同形式的高效催化性能后，环氧化物、碱、温度、CO ₂压力、反应时间和催化剂用量的影响对这些催化剂进行了研究。中性钴肟(1-3)，双钴肟盐(4-6)，以及它们与简单抗衡离子(7-9)的单盐通过¹ H 和¹³ C NMR 光谱、FT-IR 光谱、UV-Vis 光谱、LC-MS/MS 光谱仪、熔点和元素分析技术进行了表征。此外，这些化合物还被用作由环氧化物和CO ₂合成环状碳酸酯的催化剂。中性钴肟(1-3)、双钴肟盐(4-6)和它们的单盐与简单的抗衡离子(7-9)对羧化反应显示出高催化活性（在 100 °C 和 1.6 MPa 的 CO ₂压力下）环氧氯丙烷。在催化剂 ( 6)存在下进行最佳转化（含乙基的双钴氧肟盐）和 DMAP 作为助催化剂，产率为 97.9%，选择性为 98.4%。