1-Nitroanthraquinone → Anthraquinone

Participants

Reaction Steps

50 g of a crude 1-nitroanthraquinone manufactured according to Example 1 are stirred, according to U.S. Pat. No. 2,302,729, with 10 g of sodium sulphite and 500 ml of water for 6 hours at the reflux temperature. After filtration, washing and drying, 40.4 g of 1-nitroanthraquinone of the composition indicated in Table A are isolated (representing 71% of theory, relative to anthraquinone employed).

Provenance & Evidence