Chromium complexes with tridentate NN′O Schiff base ligands as catalysts for the coupling of CO2 and epoxides

Autor: M. Dolores González, Javier Castilla, Laia Cuesta-Aluja, Raquel Rivas, Farid El Guemmout, Siham Iksi, A. Aghmiz, Anna M. Masdeu-Bultó, Arantxa Orejón
Přispěvatelé: Química Física i Inorgànica, Universitat Rovira i Virgili.
Rok vydání: 2014
Předmět:
Zdroj: Journal of Molecular Catalysis A-Chemical
Repositori Institucional de la Universitat Rovira i Virgili
Universitat Rovira i virgili (URV)
ISSN: 1381-1169
DOI: 10.1016/j.molcata.2013.11.026
Popis: 10.1016/j.molcata.2013.11.026 New Cr(III) hexacoordinated complexes with tridentate NN'O-donor Schiff base ligands, M(NN'O)2Cl, have been prepared. They form active catalytic systems for the coupling of epoxides and carbon dioxide in the presence of co-catalysts. Best results were obtained with the complex with N-(2-pyridylmethyl)-3,5-di-tert-butyl-salicylaldimine (1) ligand and a co-catalyst. Cyclohexene oxide reacts with carbon dioxide in the presence of these catalysts to form mixtures of polycarbonate (PC) (productivity up to ca. 900 g PC/g Cr) and cyclic carbonate depending on the co-catalyst and conditions employed. Cyclopentene, styrene and propylene oxides form selectively the cyclic carbonates at the conditions studied (epoxide conversion up to 97%). Although some of the co-catalysts are also active for the cycloaddition, the presence of both complex and co-catalyst has proved to be beneficial.
Databáze: OpenAIRE
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