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Cycloaddition of CO 2 to Epoxides Using a Highly Active Co(III) Complex of Tetraamidomacrocyclic Ligand



Synthesis of various cyclic carbonates with yield up to 100% and turn over frequency (TOF) of 351 h-1 using CO2 and epoxides and a cobalt (III) complex of tetraamidomacrocyclic ligand is described. The catalyst was characterized by single crystal X-ray crystallography. A study of reaction conditions indicates that 2 MPa pressure of CO2 without any co-solvent is sufficient to achieve the desired product. Keywords Cyclic carbonates Á CO2-epoxides Á Co(III)-Tetraamidomacrocyclic ligand catalyst Á Co-catalysts 1 Introduction Carbon dioxide (CO2), a common green house gas, is produced in large quantities by human activities in addition to other natural phenomena. In recent years, efforts have been underway to reduce CO2 emissions. Then again, carbon dioxide is an abundant, environmentally benign, and renewable source of carbon that can be used for the synthesis of organic molecules. The use of CO2 may potentially end the utilization of toxic C1 synthons, such as phosgene, carbon monoxide, and isocyanate [1–7]. However, the extreme inertness of CO2 presents a great difficulty for its use in organic synthesis. Developing a better knowledge of the coordination chemistry of CO2 to transition metal centers might provide us with an understanding of the possibilities of incorporating CO2 into discrete



Catalysis LettersSpringer Journals

Published: Jun 1, 2010

DOI: 10.1007/s10562-010-0325-0

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