专利号:US-4154747-A 优先权日:1977-07-07 标 题:Production of virtually pure 1-amino-8-nitro-4,5-dihydroxyanthraquinone 发明人:ELSER WOLFGANG; EPPLE GERHARD; HIMMELE WALTER 权利人:BASF AG 摘要:A process for the preparation of 1-amino-8-nitro-4,5-dihydroxyanthraquinone by partially reducing the corresponding dinitrohydroxyanthraquinone and isolating the reduction product, in which crude 1,8-dinitro-4,5-dihydroxyanthraquinone obtained by nitrating 4,5-dihydroxyanthraquinone is partially reduced in a phenol-water mixture, which contains from 5 to 50% by weight of water, in the presence of an alkali metal phenolate, by means of a reductone, reductonate or a mixture of these. The product is virtually free from by-products and is suitable for use for the synthesis of dyes.
专利号:CN-111574844-B 优先权日:2020-05-14 标题 :Synthesis method of disperse blue 54
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合成参考文献
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