C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 227/40 (2006.01) C07C 229/48 (2006.01)
Patent
CA 2359080
The invention relates to a method for reducing the content of 3-dimethylamino- 2-phenylpropionic acid ethyl ester in a solution that is contaminated therewith, whereby the solution is 2-dimethylamino-1- phenyl-3-cyclohexene-1-carboxylic acid ethyl ester, in a solvent which cannot be mixed with water. According to the invention, 0.5 to 2.0 equivalents of a carboxylic acid per mol 2-dimethylamino-1-phenyl-3-cyclohexene-1-carboxylic acid ethyl ester is added to the solution and this mixture is stirred at a temperature of 50 °C to 100 °C.
Procédé de réduction de la teneur en éthylester d'acide 3-diméthylamino-2-phénylpropionique dans une solution, contaminée par ce produit, d'éthylester d'acide 2-diméthylamino-1-phényl-3-cyclohexène-1-carboxylique, dans un solvant non miscible à l'eau, caractérisé en ce qu'on mélange cette solution avec 0,5 à 2,0 équivalents d'un acide carboxylique par mole d'éthylester d'acide 2-diméthylamino-1-phényl-3-cyclohexène-1-carboxylique, et en ce qu'on agite ce mélange à une température comprise entre 50 DEG C et 100 DEG C.
Falkenberg Wolfgang
Schneider Ulrich
Thyes Marco
Basf Aktiengesellschaft
Knoll Aktiengesellschaft
Robic
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