Method for the production of esters

C - Chemistry – Metallurgy – 07 – C

Patent

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Details

C07C 67/54 (2006.01) C07C 51/48 (2006.01) C07C 59/125 (2006.01) C07C 67/08 (2006.01) C07C 69/708 (2006.01)

Patent

CA 2361645

The invention relates to a novel method for producing esters of general formula (I) from compounds of general formula (II) which are contained in aqueous solutions. The inventive method is characterized by the following steps: a) extracting the compounds of general formula (II) directly or after release from their salts in the presence of a C1-C8 alcohol and a water-immiscible solvent and b) esterification with the C1-C8 alcohol in the presence of a catalyst and an entrainer under the conditions of an azeotropic distillation. Steps (a) and (b) can be carried out separately with respect to time and space or in a successive continuous or discontinuous sequence. The variables and substituents in formulae (I, II) have the following meanings: R1 = F, Cl, -OH, -OC1-C10 alkyl, R2 = H, C1-C10 alkyl, R3 = C1-C8 alkyl, Q = -OH, -O- K+, wherein K+ is an alkali cation or alkaline earth cation, n = 0, 1 or 2.

Nouveau procédé de préparation d'esters de formule générale (I), à partir de composés contenus dans des solutions aqueuses, de formule générale (II), caractérisé en ce que (a) les composés de formule générale (II) sont extraits directement ou après avoir été séparés de leurs sels, en présence d'un alcool C1 à C8 et d'un solvant non miscible avec de l'eau, et (b) lesdits composés sont estérifiés en présence d'un catalyseur et d'un agent d'entraînement dans des conditions de distillation azéotrope avec un alcool C1 à C8, les étapes (a) et (b) pouvant être soit séparées concernant le temps et le lieu, soit menées dans une séquence à suite continue ou discontinue. Dans les formules (I) et (II), les substituants possèdent la signification suivante: R<1> = F, Cl, -OH, -O-alkyle C1-C10, R<2> = H, alkyle C1-C10, R<3> = alkyle C1-C8, Q = -OH, -O<-> K<+>, K<+> étant un cation alcalin ou alcalino-terreux, et n = 0, 1 ou 2.

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