Process for preparing 2,4-dichloro-5-hydroxyacetanilide

Details Process for preparing 2,4-dichloro-5-hydroxyacetanilide Process for preparing 2,4-dichloro-5-hydroxyacetanilide

C - Chemistry, Metallurgy

07

C

C07C 231/12 (2006.01) C07C 233/07 (2006.01)

Patent

CA 2326116

The invention relates to a method for producing 2,4-dichloro-5- hydroxyacetanilide by reacting 3-hydroxyacetanilide with sulfuryl chloride in the presence of 3 to 30 parts by weight of an aliphatic carboxylic acid with 1 to 6 carbon atoms per part by weight of 3-hydroxyacetanilide, mixing thoroughly at 20 to 100oC, separating off the gaseous components from the reaction mixture, adjusting the mixture to a ratio of 1.0 to 6 parts by weight of the aliphatic carboxylic per part by weight of 3-hydroxyacetanilide used and separating off 2,4-dichloro-5-hydroxyacetanilide as a solid.

L'invention concerne un procédé de préparation de 2,4-dichloro-5-hydroxyacétanilide par réaction de 3-hydroxyacétanilide avec du chlorure de sulfuryle en présence de 3 à 30 parties en poids d'un acide carboxylique aliphatique ayant entre 1 et 6 atomes de carbone par partie en poids de 3-hydroxyacétanilide, en mélange intensif à une température comprise entre 20 et 100 ·C, puis par séparation des constituants gazeux contenus dans le mélange réactionnel, par établissement d'un rapport de 1,0 à 6 parties en poids d'acide carboxylique par partie en poids de 3-hydroxyacétanilide utilisé et par séparation de 2,4-dichloro-5-hydroxyacétanilide sous forme de solide.

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