1552-42-7Relevant articles and documents
Crystal violet lactone synthesis method (by machine translation)
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Paragraph 0017; 0018, (2017/08/23)
Crystal violet lactone synthesis method, relates to a method for synthesizing the thermo-compression is sensitive dye, in order to urea, dimethyl aniline, inter-a aminobenzoic acid, P-dimethyl amino formaldehyde and other material as the raw material for synthesis, through the Schiff base stage, urea intermediate stage, colorless crystalviolet stage and the last stage of the oxidation reaction, synthetic crystal violet lactone. Synthetic method comprises the stage of: (1) Schiff base stage: to di-methyl amino formaldehyde and urea reaction generating Schiff base; (2) urea intermediate stage: a stage on the production of products and dimethyl aniline reaction to obtain the urea intermediate; (3) colorless crystal violet lactone stage: urea intermediate and inter-dimethylamino benzoic acid as a raw material reacts to produce a colourless crystalviolet; (4) oxidation reaction stage: colorless crystalline purple after hydrogen peroxide generating crystal violet lactone catalytic oxidation. The method to avoid impurity generated synthetic method, thereby improving the yield of the product, at the same time reduces the discharge of solid wastes. (by machine translation)
Preparation process of phthalide compound
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, (2008/06/13)
A process for preparing a phthalide compound represented by the formula (1): STR1 wherein R1, R2, R3, R4, R5 and R6 are individually an alkyl group, and R1 and R2, R3 and R4, and R5 and R6 can respectively bond to each other to form a heterocyclic ring together with a nitrogen atom, comprising oxidizing a triphenylmethane compound represented by the formula (2) STR2 wherein R1, R2, R3, R4, R5 and R6 are the same as above, is oxidized in the presence of activated carbon in an aqueous solvent by an oxidizing agent. The process can provide a fast reaction that produces a high purity product with high yield.
STRUCTURE OF THE PRODUCT FROM NITRATION OF MALACHITE GREEN LACTONE
Chunaev, Yu. M.
, p. 2012 - 2014 (2007/10/02)
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