Nb(V) compounds as epoxides carboxylation catalysts: the role of the solvent

Nb 2O 5 and NbCl 5 have been used as catalysts for the carboxylation of epoxides. Temperature, carbon dioxide pressure, and reaction time influence the conversion yield. The role of the solvent has been investigated: amides as solvent are good promoters, and the addition of small amounts of dichloro...

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Bibliographic Details
Published in:Journal of molecular catalysis. A, Chemical Chemical, 2003-09, Vol.204, p.245-252
Main Authors: Aresta, Michele, Dibenedetto, Angela, Gianfrate, Libero, Pastore, Carlo
Format: Article
Language:English
Subjects:
Carbon dioxide
Catalysts
Epoxides
Organic carbonates
Solvent
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Summary:Nb 2O 5 and NbCl 5 have been used as catalysts for the carboxylation of epoxides. Temperature, carbon dioxide pressure, and reaction time influence the conversion yield. The role of the solvent has been investigated: amides as solvent are good promoters, and the addition of small amounts of dichloromethane (0.1 ml) contributes to produce high conversion yields. The reaction is 100% chemio-selective. The synthesis of organic cyclic carbonates from epoxides and CO 2 is described. The role of the solvent is discussed, together with that of Nb(V) catalysts (Nb 2O 5 and NbCl 5). The reaction is very selective and affords the conversion of epoxides into the relevant carbonates in high yield.
ISSN:1381-1169
1873-314X
DOI:10.1016/S1381-1169(03)00305-4