1-Nitroanthraquinone → 1-Aminoanthraquinone

Participants

Reaction Steps

10 parts of the nitroanthraquinone used in Example 1 was made pasty with 23.9 parts of sodium sulfide flakes (60% purity) and 11 parts of water, and this dark green paste was poured into 800 parts of hot water of 95°-98° C. and the remainder was poured by washing with 170 parts of cold water. This was followed by additional 2-hour agitation at 97°-100° C. The reaction mixture was then filtered at 70°-80° C., washed and dried to obtain 8.38 parts of an aminoanthraquinone with purity of 75.0%. The yield of 1-aminoanthraquinone was 96.0%. The aminoanthraquinone crystals mostly had the size of 1 to 2μ as shown in FIG. 4, but a part of the crystals had size of 5 to 10μ. Filterability of the product was very bad as in the case of Referential Examples 1 and 2.

Provenance & Evidence