- Method for synthesizing M acid
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The invention belongs to the field of chemical synthesis, and particularly relates to a method for synthesizing M acid. The method includes reacting 5-dinitro-2,4,6-trimethylbenzenesulfonic acid adopted as a raw material at a high temperature under high pressure with the presence of carbon monoxide gas by adopting water as a solvent, adopting selenium as a catalyst and adopting an alkali as a co-catalyst; performing stirring and filtration; adjusting pH with hydrochloric acid to precipitate a product; and performing suction filtration and recrystallization to obtain a target product. The moleratio of the 5-dinitro-2,4,6-trimethylbenzenesulfonic acid to the selenium is 100:2-10, the mole ratio of the 5-dinitro-2,4,6-trimethylbenzenesulfonic acid to the water is 1:111 to 1:667, and the moleratio of the 5-dinitro-2,4,6-trimethylbenzenesulfonic acid to the co-catalyst is 5:1 to 5:8. The alkali is an organic alkali or an inorganic alkali. The method adopts a high-pressure reaction in a one-pot reaction manner, and is low in equipment investment, simple and safe to operate, low in cost, capable of meeting requirements of green chemistry, economical, capable of phase transfer catalysis,and the like.
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Paragraph 0025-0054
(2019/11/20)
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- Novel water-soluble anthraquinone dyes
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The invention relates to novel, water-soluble anthraquinone dyes which, in the form of the free acid, have the formula I STR1 in which X is halogen, R1 is an unbranched or branched alkyl radical having 4 to 8 carbon atoms, R2 and R3 independently of one another are an unbranched or branched alkyl radical having 1 to 4 carbon atoms, R4 is hydrogen, an unbranched or branched alkyl radical having 1 to 4 carbon atoms, a free or acylated amino group or a fibre-reactive radical bonded via an amino group, R5 is hydrogen or an unbranched or branched alkyl radical having 1 to 4 carbon atoms and R6 and R7 independently of one another are hydrogen, an unbranched or branched alkyl radical having 1-4 carbon atoms, a --SO3 H group, halogen or a radical of the formula --CH2 --NH--CO--Y, in which Y is an alkyl or alkenyl radical having 1 to 4 carbon atoms which is unsubstituted or substituted by one or two halogen atoms, or is a substituted or unsubstituted phenyl radical, with the proviso that at least one of the radicals R6 or R7 is a --SO3 H group.
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