Method of preparing 2-trifluoromethoxybenzene sulphonamide

Details Method of preparing 2-trifluoromethoxybenzene sulphonamide Method of preparing 2-trifluoromethoxybenzene sulphonamide

C - Chemistry, Metallurgy

07

C

C07C 311/29 (2006.01) C07C 303/40 (2006.01) C07C 309/87 (2006.01)

Patent

CA 2237842

2-Trifluoromethoxy-benzenesulphonamide, of the formula (I), (see formula I) which can be used as intermediate for the preparation of certain herbicidally active compounds is obtained in very high yield and high purity by a process in which halogenated trifluoromethoxy-benzenesulphonamides of the general formula (II) (see formula II) in which X1 represents halogen and X2 represents hydrogen or halogen are reacted with hydrogen in the presence of a catalyst and in the presence of a diluent and, if appropriate, in the presence of an acid acceptor at temperatures between 0°C and 200°C ("dehalogenated"), the resulting compound of the formula (I) is isolated in the customary manner in the event that "X2=halogen" and convened into a pure, crystalline product by treating it with a protic polar organic liquid and isolated by removing the liquid component by means of filtration with suction in the event that "X2=H".

L'invention concerne un procédé de production du 2-trifluorométhoxy-benzolsulfonamide de la formule (I), utilisé comme produit intermédiaire dans la production de certaines substances actives herbicides, avec des rendements élevés et une grande pureté, en faisant réagir des trifluorométhoxy-benzolsulfonamides halogénés de la formule (II) où X<1> représente halogène et X<2> représente hydrogène, avec de l'hydrogène en présence d'un catalyseur et d'un diluant et éventuellement en présence d'un accepteur d'acide à des températures comprises entre 0 DEG C et 200 DEG C ("déshalogénation"). Le composé ainsi constitué (I) est isolé de façon usuelle si "X<2> = halogène", et si "X<2> = H", il est transformé en un produit pur, cristallin par traitement avec un liquide organique polaire protique puis isolé par aspiration des composants fluides.

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