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Chandrasekhar S, Patro V, Chavan LN, Chegondi R, Grée R. Multicomponent reactions in PEG-400: ruthenium-catalyzed synthesis of substituted pyrroles. Tetrahedron Lett 2014. [DOI: 10.1016/j.tetlet.2014.08.105] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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Terblans YM, Huyser JJ, Huyser M, Green MJ, Young DA, Sibiya MS. Aluminium triflate as catalyst for epoxide ring-opening and esterification reactions Mechanistic aspects. CAN J CHEM 2005. [DOI: 10.1139/v05-098] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Al(CF3SO3)3 is a highly effective catalyst for the ring opening of epoxides with methanol, as well as for the esterification of carboxylic acids with alcohols. Factors that influence the rate of the ring opening of butene oxide with methanol and the esterification of acetic acid with n-propanol and ethanol were investigated. It was found that low concentrations (e.g., ~5 ppm) of Al(CF3SO3)3 catalyze the ring-opening reactions, whereas considerably higher concentrations are required for esterification reactions. Molecular modeling studies suggest that these differences can be rationalized in terms of the formation energies of the active intermediates of these reactions.Key words: epoxide, ring opening, esterification, aluminium triflate.
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