Process for the preparation of an organozinc reagent

C - Chemistry – Metallurgy – 07 – F

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C07F 3/06 (2006.01) C07B 53/00 (2006.01) C07C 29/40 (2006.01) C07D 213/30 (2006.01)

Patent

CA 2273942

A process for the preparation of an aromatic organozinc compound is provided. The process comprises reacting a zinc chloride, bromide or iodide and an organometallic compoud of another metal comprising an aromatic moiety, producing a reaction product comprising an organozinc compound and a halide salt of the other metal. The reaction product is then contacted with a liquid hydrocarbon, in which the organozinc compound is soluble and the halide salt of the other metal is of low solubility. The halide salt of the other metal is separated from the hydrocarbon, and the organozinc compound can be recovered from the hydrocarbon. Organozinc compounds produced by this process can be employed to generate chiral centres in suitable substrates.

L'invention concerne un procédé pour la préparation d'un organate-zinc aromatique. Ce procédé consiste à faire réagir un chlorure de zinc, bromure ou iodure et un composé organométallique d'un autre métal comprenant une fraction aromatique pour obtenir un produit de réaction comprenant un organate-zinc et un sel d'halogénure de l'autre métal. Le produit de réaction est ensuite placé en contact avec un hydrocarbure liquide, dans lequel l'organate-zinc est soluble et le sel d'halogénure de l'autre métal présente une faible solubilité. Le sel d'halogénure de l'autre métal est séparé de l'hydrocarbure, et l'organate-zinc peut être récupéré à partir de l'hydrocarbure. Les organates-zinc obtenus par ce procédé peuvent être utilisés pour générer des centres chiraux dans des substrats appropriés.

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