81-26-5Relevant articles and documents
Method for synthesizing Vat Golden Orange G original dye
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Paragraph 0012; 0030; 0031; 0032; 0037; 0038; 0042; 0043, (2017/05/10)
The invention discloses a method for synthesizing a Vat Golden Grange G original dye, which includes the specific steps of: (1) a bromination reaction: taking 2-methyl anthraquinone as a raw material, taking an aprotic solvent as a medium, and reacting with a liquid bromine in a weak base environment to generate 1-bromo-2-methyl anthraquinone; (2) a coupling reaction: taking the 1-bromo-2-methyl anthraquinone as the raw material, adding a catalyst, taking the aprotic solvent as the medium, and producing biquinone C through the coupling reaction; and (C) a closed loop oxidation reaction: taking the biquinone C as the raw material, performing the closed loop reaction in a stable solvent formed by a strong base and an alcoholic solvent, and obtaining the Vat Golden Grange G original dye through an air oxidation reaction. In this technology route, by-products are few, the environmental pollution is little, the reaction yield is higher, the reaction time is shorter, and the industrial production is more convenient.