C - Chemistry – Metallurgy – 07 – D
Patent
C - Chemistry, Metallurgy
07
D
C07D 335/02 (2006.01) A01N 43/14 (2006.01)
Patent
CA 2421995
The invention relates to a method for producing 2-{1-[2-(4-chlorophenoxy)- propoxyimino]-butyl}-3-hydroxy-5-(tetrahydrothiopyrane-3-yl)-cyclohex-2-enone lithium salt by reacting the corresponding acid 2-{1-[2-(4-chlorophenoxy)- propoxyimino]-butyl}-3-hydroxy-5-(tetrahydrothiopyrane-3-yl)-cyclohex-2-enone with lithium hydroxide, and for extracting the lithium salt. It is advantageous to use a solvent mixture containing methanol and at least one aromatic hydrocarbon, and to remove part of the solvent before extraction. It is especially preferable to dissolve the acid in an aromatic hydrocarbon, preferably toluol, and to use a methanolic lithium hydroxide solution. The product obtained efficiently according to the inventive method also has considerable advantages in terms of formulation techniques.
L'invention concerne un procédé pour préparer du sel de lithium 2-{1-[2-(4-chlorphenoxy)-propoxyimino]-butyl}-3-hydroxy-5-(tétrahydrothiopyrane-3-yl)-cyclohex-2-enone, selon lequel l'acide correspondant 2-{1-[2-(4-chlorphenoxy)-propoxyimino]-butyl}-3-hydroxy-5-(tétrahydrothiopyran-3-yl)-cyclohex-2-enone et l'hydroxyde de lithium sont mis à réagir, et pour obtenir le sel de lithium. Il est alors avantageux d'utiliser un mélange de solvants contenant du méthanol et au moins un hydrocarbure aromatique, et d'enlever au moins une partie du solvant avant la préparation. Il est préférable de dissoudre l'acide dans un hydrocarbure aromatique, notamment le toluol, et d'utiliser une solution méthanolique d'hydroxyde de lithium. Le produit obtenu de manière efficace selon ledit procédé présente en outre des avantages considérables en termes de technique de formulation.
Gotz Norbert
Harreus Albrecht
Heimann Frank
Kober Reiner
Maywald Volker
Basf Aktiengesellschaft
Robic
LandOfFree
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