Process for producing 3-bromobenzoyl halides

Details Process for producing 3-bromobenzoyl halides Process for producing 3-bromobenzoyl halides

C - Chemistry, Metallurgy

07

C

C07C 51/62 (2006.01) C07C 63/10 (2006.01)

Patent

CA 2385315

Meta-bromination with suppression of para-bromination is achieved by forming a reaction mixture comprised of: i) bromine chloride; ii) a bromination catalyst; and iii) a benzoyl halide, and maintaining the temperature of the resultant reaction mixture at one or more temperatures above 0 ~C, but not greater than 30 ~C. The bromine chloride is preferably formed in situ, most preferably by sparging gaseous chlorine into a mixture of bromine, finely- divided iron, and benzoyl chloride.

Selon l'invention, on obtient une méta-bromation avec suppression de para-bromation en formant un mélange réactionnel renfermant du chlorure de brome, un catalyseur de bromation, et un halogénure de benzoyle, et en maintenant la température du mélange réactionnel résultant à une ou plusieurs valeurs supérieures à 0 ·C, mais ne dépassant pas 30 ·C. Le chlorure de brome est avantageusement formé in situ, de préférence en injectant du chlore gazeux dans un mélange de brome, de fer finement divisé, et de chlorure de benzoyle.

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