反应详情

An article in Journal of the American Chemical Society, 72 (1950), 798, discloses that 2,6-dichloro-4-nitroaniline, ethanol and sodium nitrate can be reacted at the boil, in the absence of water and in the presence of concentrated sulfuric acid, to give an 84% yield of 3,5-dichloronitrobenzene. A corresponding reaction to form the 3,5-dibromonitrobenzene proceeds with a yield of 91%. The process is unsatisfactory in respect of the yield and purity of the end product and in respect of simple, reliable and economical operation, particularly on an industrial scale.