Pyridinium-functionalized metalloporphyrins as bifunctional catalysts for cycloaddition of epoxides and carbon dioxide |
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| Authors: | Jiajia Yi Shu Sun Zhonglu Li Xuyun Gao Xuzhuo Sun Ning Wang Jun Li |
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| Institution: | 1. Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, College of Chemistry & Materials Science, Northwest University, Xi'an, 710069 China;2. School of Chemical Engineering, Ordos Institute of Technology, Ordos, 017010 China;3. College of Chemistry, Chemical and Environmental Engineering, Henan University of Technology, Zhengzhou, 450001 China |
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| Abstract: | New pyridinium-functionalized metalloporphyrins MEtPpBr4 (M = Zn2+, Co2+, Ni2+, Cu2+; EtPp = 5, 10, 15, 20-tetra(4-(3-(N-ethyl-4-pyridyl)pyrazolyl)phenyl)porphyrin) were synthesized as bifunctional catalysts for the cycloaddition reactions of epoxides and CO2. The effects of catalyst loading, CO2 pressure, reaction temperature and time on catalytic activity were investigated. ZnEtPpBr4 ( 1 ) and CoEtPpBr4 ( 2 ) exhibited efficient activities in the cycloaddition reactions of various epoxides with CO2 as at 120 °C under 2 MPa of CO2 pressure without solvent. Most of corresponding cyclic carbonates could be obtained in almost quantitative yields and > 99.9% selectivity with molar ratio of epoxide/catalyst 2222 after 8 hr of reaction. |
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| Keywords: | Bifunctional catalysts carbon dioxide cyclic carbonates epoxides Metalloporphyrins |
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