2938-40-1Relevant academic research and scientific papers
Dye intermediate namely (3-beta-hydroxyethylsulfonyl)aniline-4-aminobenzenesulfonic acid and preparation method thereof
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Paragraph 0030; 0033, (2017/03/25)
The invention relates to a dye intermediate namely (3-beta-hydroxyethylsulfonyl)aniline-4-aminobenzenesulfonic acid and a preparation method thereof. The intermediate is (3-beta-hydroxyethylsulfonyl)aniline-4-aminobenzenesulfonic acid which has a structural formula as shown in a formula (I) in the specification. According to the invention, the dye intermediate is prepared through a series of preparation processes like chlorosulfonation of 2-chloro-5-nitrobenzenesulfonic acid, reduction with sodium sulfite, hydroxyethylation, a condensation reaction of the hydroxyethylated product and p-aminobenzenesulfonic acid, nitro hydrogenation reduction, etc. Compared with a common dye intermediate, the novel dye intermediate prepared by using the method provided by the invention can well improve water solubility of a prepared dye, and reduce production cost and environmental pollution.
