Method for preparing p-hydroxymandelic compounds optionally...

C - Chemistry – Metallurgy – 07 – C

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C07C 51/367 (2006.01) C07C 45/67 (2006.01) C07C 51/377 (2006.01) C07C 59/52 (2006.01) C07C 59/64 (2006.01)

Patent

CA 2334848

The invention concerns a method for preparing p-hydroxymandelic compounds optionally substituted and their derivatives. More particularly, it concerns a method for preparing p-hydroxymandelic acid and methoxy-3 p-hydroxymandelic acid and their derivatives. The invention concerns a method for preparing p-hydroxymandelic compounds optionally substituted and their derivatives, which consists in condensing in water, in the presence of an alkaline agent, an aromatic compound bearing at least a hydroxyl group and whereof the position in para is free, with glyoxylic acid, said method being characterised in that the reaction is carried out in the presence of an efficient amount of a compound bearing at least two carboxylic functions.

La présente invention a pour objet un procédé de préparation de composés p- hydroxymandéliques éventuellement substitués et dérivés. Elle vise plus particulièrement la préparation de l'acide p-hydroxymandélique et de l'acide méthoxy-3 p-hydroxymandélique et dérivés. L'invention a pour objet un procédé de préparation de composés p-hydroxymandéliques éventuellement substitués et dérivés qui consiste à effecteur la condensation dans l'eau, en présence d'un agent alcalin, d'un composé aromatique porteur d'au moins un groupe hydroxyle et dont la position en para est libre, avec l'acide glyoxylique, ledit procédé étant caractérisé par le fait que la réaction est conduite en présence d'une quantité efficace d'un composé porteur d'au moins deux fonctions carboxyliques.

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