ESTERIFICATION CATALYST, METHOD FOR PRODUCING ESTER, ACYLATION CATALYST AND METHOD FOR PRODUCING ACYLATED SUBSTANCE

摘要

PROBLEM TO BE SOLVED: To obtain an ester in high yield by reacting alcohol with carboxylic acid and to obtain an acylated substance in high yield by reacting an aromatic compound with carboxylic acid or its derivatives.

SOLUTION: This esterification catalyst is based on metal salt of a heteropolyacid in which all protons contained in the heteropolyacid are substituted for a metal cation having ≥9 electronegativity and the ionic radius of 70 to 120 picometers. This acylation catalyst is based on metal salt of another heteropolyacid in which at least a part of the protons contained in the heteropolyacid is substituted for another metal cation having >11 electronegativity and the ionic radius of 70 to 120 picometers.

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