METHOD FOR PRODUCING ESTER AND ESTERIFICATION CATALYST

WIPO Patent Application WO/2005/085172

A1

A method for producing an ester by reacting a carboxylic acid and an alcohol is disclosed wherein an ammonium sulfonate is used as an esterification catalyst which ammonium sulfonate is composed of an ammonium cation having a basic skeleton represented by the formula (1) below (with n being 1 or 2) wherein a hydrogen atom in a benzene ring and a hydrogen atom bonded to a crosslinking carbon may be substituted, and a sulfonic acid anion expressed as RSO₃^- (wherein R is an allene, a perfluoroalkane having 1-8 carbon atoms or a bulky alkane).

ISHIHARA KAZUAKI (JP)
SAKAKURA AKIRA (JP)

PCT/JP2005/004398

September 15, 2005

March 08, 2005

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INST NAGOYA IND SCIENCE RES (JP)
ISHIHARA KAZUAKI (JP)
SAKAKURA AKIRA (JP)

B01J31/02; C07C67/08; C07C69/612; C07C69/708; C07C69/78; C07B61/00; (IPC1-7): C07C67/08; B01J31/02; C07C69/612; C07C69/708; C07C69/78

NAKAGAWA A ET AL: "Ammonium-en Shokubai o Mochiiru Dassui Shukugo Hanno ni yoru Ester Gosei.", THE CHEMICAL SOCIETY OF JAPAN., 11 March 2004 (2004-03-11), pages 1265, XP002996616
WAKASUGI K ET AL: "Diphenylammonium triflate (DPAT): efficient catalyst for esterification of carboxylic acids and for transesterification of carboxylic esters with nearly equimolar amounts of alcohols.", TETRAHEDRON LETTERS., vol. 41, 2000, pages 5249 - 5252, XP004222048
See also references of EP 1731498A4

ITEC INTERNATIONAL PATENT FIRM (9-26 Sakae 2-chome, Naka-k, Nagoya-shi Aichi, JP)

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