Method for producing ester condensed product

C - Chemistry – Metallurgy – 07 – C

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C07C 67/08 (2006.01) C07C 69/612 (2006.01) C07C 69/767 (2006.01)

Patent

CA 2540823

The present invention is to provide a method for preparing an ester condensate and a catalyst therefor; wherein the method enables synthesis of enormous amounts of ester condensates comprising a specific structure in good yield, by a reaction of carboxylic acid and alcohol in equimolar amounts, while generation of by-products is prevented; wherein the catalyst exhibits good catalytic efficiency as a catalyst for use, the use of the catalyst in small amount is sufficient, and the catalyst is reusable and can be used repeatedly; therefore, the method for preparing an ester condensate of the present invention and the catalyst therefor can be applied to industrial methods which are preferable in view of green chemistry. Esterification reaction is performed by using a catalyst comprising a zirconium(IV)compound and/or a hafnium(IV)compound and an iron compound and a gallium compound. It is preferable that the zirconium(IV) compound is a compound represented by Zr(OH)a(OR1)b, (wherein, R1 represents an acyl group or an alkyl group, and each of a and b is 0 or any one of integers of 1 to 4 and the relationship of a + b = 4 is satisfied), and a zirconium(IV) halide.

L'invention concerne un procédé permettant de produire un produit à condensation des esters, selon lequel une réaction d'estérification est effectuée à l'aide d'un catalyseur comprenant un composé zirconium (IV) et/ou un composé hafnium (IV) et un composé fer et/ou un composé gallium ; ainsi qu'un catalyseur utilisé dans ledit procédé. Il est préférable que le composé zirconium (IV) soit un composé représenté par Zr(OH)a(OR?1¿)b [où R?1¿ désigne un groupe acyle ou un groupe allyle, et a et b désignent chacun 0 ou un nombre entier compris entre 1 et 4 et la relation de a + b = 4 est satisfaite] ou un halogénure de zirconium (IV). Ledit procédé permet de produire un produit à condensation des esters de structure spécifique par réaction de quantités équimolaires d'un acide carboxylique et d'un alcool, avec inhibition de la formation de produits secondaires, dans un bon rendement, à une large échelle. Le catalyseur présente une bonne efficacité catalytique et s'utilise en quantité réduite. Il peut être réutilisé, à plusieurs reprises. Ledit procédé donne ainsi accès à un processus industriel souhaitable sous l'angle de la chimie écologique.

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