| 摘要 |
N-nitrosodiphenylamine is rearranged to 4-nitrosodiphenylamine of high purity by dissolving it in a water-immiscible non-polar solvent such as toluene and reacting it with a solution of dry HCl in anhydrous methanol, thereby producing 4-nitrosodiphenylamine hydrochloride while dissolving most of the by-product impurities in the toluene, neutralizing the resulting slurry with strong aqueous alkali to a pH above about 11.5, drawing off the toluene solution containing the impurities, and adding a limited quantity of acid to the aqueous residue to precipitate a pure 4-nitrosodiphenylamine therefrom while retaining residual alkali-soluble impurities in solution.
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