A process for the eco-friendly preparation of 3,...

Details A process for the eco-friendly preparation of 3,... A process for the eco-friendly preparation of 3,...

C - Chemistry, Metallurgy

07

C

C07C 253/30 (2006.01) C07C 255/53 (2006.01)

Patent

CA 2753644

A highly pure 3,5-dibromo-4-hydroxybenzonitrile (bromoxynil) has been prepared in high yield from 4-hydroxy- benzonitrile using eco-friendly brominating reagent comprising of 2:1 mole ratio of bromide to bromate salts in aqueous acidic medium without any catalyst under ambient conditions with no work up procedure. The product 3,5-dibromo-4-hydroxybenzonitrile was obtained in 91-99% yield with melting point 189-191°C and more than 99% purity by gas chromatographic analysis without any purification.

La présente invention concerne un 3,5-dibromo-4-hydroxybenzonitrile (bromoxynil) très pur qui a été préparé avec un rendement élevé à partir de 4-hydroxybenzonitrile au moyen d'un réactif de bromation respectueux de l'environnement constitué d'un rapport molaire 2:1 de bromure par rapport aux sels de bromate dans un milieu aqueux acide sans aucun catalyseur dans des conditions ambiantes sans procédure de traitement final. Le produit 3,5-dibromo-4-hydroxybenzonitrile a été obtenu avec un rendement de 91 à 99 % avec un point de fusion de 189 à 191 °C et une pureté de plus de 99 % par analyse par chromatographie gazeuse sans aucune purification.

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