3-NITROBIPHEN'YL249If the passage of nitrous fumes is continued after the dark green solutionstage, the yield is reduced considerably and the product is tarry. Unfor-tunately, there is no simple way of determining exactly when nitrosationis complete. The nitrosoacetylamine is precipitated when the solution ispoured into a large volume of ice water. If the product is an oil, it is dis-solved in the aromatic liquid (Component B), and the solution is washedrapidly with water and then kept over a drying agent; if the nitroso-acetylamine is solid, it may be filtered and dried on a porous plate.Most of the solid nitrosoacetylarylamines can be kept at room tempera-ture for over a day without appreciable decomposition.A considerable number of acylarylamines, among them o-chloroacet-anilide, 2,6-dichloro-4-nitroacetanilide, and l-acetamido-2-methylan-thraquinone, form abnormal nitroso compounds with nitrous fumes;others, such as 4-dimethylamino-4'-acetamidoazobenzene, benzene-p-
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