Beta-ketophosphonates

Details Beta-ketophosphonates Beta-ketophosphonates

C - Chemistry, Metallurgy

07

F

C07F 9/40 (2006.01)

Patent

CA 2463287

A method for making .beta.-ketophosphonates by reacting a trialkyl phosphonocarboxylate (such as triethyl phosphonoacetate) with an acyl halide (such as acetyl chloride) in a three-stage reaction involving ester formation, decarboxylation and purification, wherein the reaction is carried out in a single solvent, which is not removed from the reaction mixture until the purification stage. Suitable solvents for this purpose include halogenated aromatic hydrocarbons (such as mono-chlorobenzene).

L'invention concerne un procédé amélioré relatif à l'élaboration de bêta-kétophosphonates par réaction entre un trialkyl phosphonocarboxylate (du type triéthyl phosphonoacétate) et un halogénure d'acyle (du type chlorure d'acétyle) dans une réaction qui fait intervenir la formation d'esters, suivie d'une décarboxylation, puis d'une purification. L'amélioration consiste à conduire la réaction dans un solvant unique, qui n'est pas extrait du mélange réactif avant la phase de purification. Les hydrocarbures aromatiques halogénés figurent parmi les solvants appropriés à ce type de réaction (du type mono-chlorobenzene).

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