Forbedret fremgangsmåde til fremstilling af 2-halogenpyridin-N-oxid

摘要

The present invention concerns a process for the preparation of 2-halopyridine N-oxide by reaction of 2-halopyridine with hydrogen peroxide in aqueous solution in the presence of an acid anhydride as catalyst in which, according to the invention, as catalyst there is used an anhydride of the formula Iwhereby the aromatic rings can be substituted by alkyl groups or halogens or can be anellated with a further aromatic ring.