Abstract
A series of cobaloxime complexes (1-6) and corresponding to positively charged phosphonium linked cobaloximes (called cobaloximes-PCPL) (1a-6a) have been prepared in high yields and characterized by means of NMR (1H, 13C, and 31P) spectra, FT-IR spectra, UV–Vis spectra, mass spectra, melting point as well as elemental analysis. Following a full characterization, the study of spectroscopic properties of these novels cobaloximes/cobaloximes-PCPL compounds was done in detail. Under optimized reaction conditions, these novel cobaloximes (1-6) and cobaloximes-PCPL (1a-6a) were applied to the as a molecular catalyst for the cycloaddition of epoxides with CO2 without organic solvent. In a combination with (4-bromo butyl)triphenylphosphonium bromide (BTP) and cobaloxime compounds, namely cobaloximes-PCPL were identified as highly active catalysts for the formation of cyclic carbonates compared to previously reported cobaloximes catalysts by our groups. As an axial group bounding to the Co(III) center of cobaloximes-PCPL, (BTP) was barely revealed that it has an effect on catalyst activities. Also, a systematic investigation of reaction parameter effects such as temperature, time and pressure was done.
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