| 摘要 |
<p>Add to 2657234; 2555736. Prepn. of halonitrobenzenes of formula (I) is effected by (a) reacting an anilide of formula (II) with HNO3; (b) reacting the resulting nitroanilide (III), without isolating it from the reaction mixt., with an acid and H2O at >=25 degrees c; (c) reacting the resulting nitroaniline (IV), without isolating it from the reaction mixt., with a halogenating agent in the presence of H2O and acid; and (d) reacting the resulting halonitroaniline (V), without isolating it from the reaction mixt., with an aliphatic, alicyclic or araliphatic alcohol and nitrosating agent in the presence of acid and H2O at >=35 degrees C. R1 and R2 are halogen, or R2 can be H; R3 is H or an aliphatic gp.</p> |
