1-Nitroanthraquinone → 1-Aminoanthraquinone

Participants

Reaction Steps

Crude 1-nitroanthraquinone (A) (10 parts) is treated with sodium sulfite in the same manner as in Example 2. The resultant suspension is subjected to centrifugation, and the supernatant is removed off by decantation. The residual wet cake comprising fine particles of 1-nitroanthraquinone with high purity is charged into an autoclave together with water (21 parts) and kept at 125° C. for 14 hours while introducing gaseous ammonia (7 parts) therein. When the completion of the amination is confirmed, ammonia is recovered, and the reaction mixture is cooled and filtered. The collected product is washed and dried to obtain 1-aminoanthraquinone with high purity (6.2 parts). The composition and the yield are as shown in Table 1.

Provenance & Evidence