An Improved Method for the Preparation of 4,5-Diaminochrysazin |
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Authors: | P. Hareesh Kumar G. Venkateshwara Rao B. Narayanaswamy |
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Affiliation: | Vittal Mallya Scientific Research Foundation , Bangalore, India |
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Abstract: | 4,5-Diaminochrysazin was prepared from chrysazin by ethylation and nitration followed by reaction with hydroiodic acid (HI). Treatment of 1,8-diethoxy-4,5-dinitroanthraquinone with HI resulted not only in O-deethylation, but also in reduction of nitro groups with more than 95% yield. This is a unique finding and is reported for the first time with a definite improvement over literature methods and is suitable for scale-up. |
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Keywords: | Anthraquinone deethylation ethylation nitration reduction |
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