C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 67/343 (2006.01) C07C 69/618 (2006.01)
Patent
CA 2339997
The invention relates to a method for producing atropic acid ethyl ester with a methyl ester content of maximally 0.05 %, by reacting ethyl phenylacetate with paraformaldehyde in the presence of a base. Said method is characterized in that as ethyl phenylacetate a product is used which contains no more than 0.03% of the corresponding methyl phenylacetate and in that the reaction is carried out in N-methylpyrrolidone or N,N-dimethylformamide.
L'invention concerne un procédé qui permet de fabriquer un éthylester d'acide atropique ayant une teneur en méthylester ne dépassant pas 0,05 % et qui consiste à faire réagir l'éthylester d'acide phénylacétique avec du paraformaldéhyde en présence d'une base. Selon le procédé, on utilise comme éthylester d'acide phénylacétique un produit contenant au maximum 0,03 % du méthylester d'acide phénylacétique correspondant et on conduit la réaction de façon à obtenir de la N-méthylpyrrolidone ou du N,N-diméthylformamide.
Falkenberg Wolfgang
Schneider Ulrich
Thyes Marco
Wenz Conny
Basf Aktiengesellschaft
Knoll Aktiengesellschaft
Robic
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