Rhone-poulenc Specialties Chimiques

Rhone-poulenc Specialites Chimiques

Rhone-poulenc Chimie

Louis Amiet

Michel Desbois

Bernard Langlois

Camille Disdier

A process for the preparation of ethyltrifluoroacetoacetate is provided. In this first step, ethyltrifluoroacetate is condensed with ethyl acetate in the presence of sodium ethoxide in cyclohexane. In a second step, the condensation product is neutralized with a protonic acid, such as formic acid, to release an enol. In the third step, the ethyltrifluoroacetoacetate obtained is separated by distillation. The ethyltrifluoroacetoacetate is used as an intermediate in syntheses in the pharmaceutical or plant protection industry.

Process for the preparation of ethyltrifluoroacetoacetate

A process for the preparation of ethyl trifluoroacetate, in which:

Process for the preparation of ethyl trifluoroacetate

A process for preparing alkali metal salts of trifluoroacetic acid in the anhydrous and crystalline state. In a first stage, trifluoroacetic acid is neutralized with an alkaline agent in a medium consisting essentially of an alcohol containing 3 to 4 carbon atoms. In a second stage, the water formed by the neutralization reaction is removed by azeotropic distillation. In a third state, the remainder not removed by distillation in the second stage is treated by adding a hydrocarbon which does not solubilize an alkali metal trifluoroacetate and which forms an azeotrope with the alcohol to separate crystals of anhydrous alkali metal trifluoroacetate.

Process for preparing alkali metal salts of trifluoroacetic acid in the

A process for the preparation of methyltrifluoroacetate. Trifluoroacetic acid is contacted with an excess of methanol and distilled to form a methyltrifluoroacetate/methanol azeotrope. The azeotrope is contacted with trifluoroacetic acid in the presence of a catalytic quantity of a strong acid followed by distillation to obtain methyltrifluoroacetate. The methyltrifluoroacetate can be used as a synthesis intermediate in the pharmaceutical industry.

Process for the preparation of methyltrifluoroacetate

A process for preparing trifluoroacetic or trichloroacetic acid esters, wherein trifluoroacetic or trichloroacetic acid is brought together with a non-perfluorinated alcohol in liquid hydrofluoric acid and wherein the ester obtained is separated by decantation. The trifluoroacetic or trichloroacetic acid esters are used as synthesis intermediates in the pharmaceutical or the plant-protection industry.

Process for preparing trifluoroacetic or trichloroacetic acid esters

The present invention relates to a process for the preparation of trifluoroacetic anhydride which comprises bringing together trifluoroacetic acid with the anhydride of an .alpha.-halogenated acid.

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Lyons, France

Louis Amiet