1141-38-4Relevant articles and documents
Preparation of 2,6-naphthalic acid by liquid phase oxidation of 2,6-diisopropyl naphthalene
Peng, Ge
, p. 735 - 738 (2013)
An orthogonal experiment was carried out and the effects of bromine, metal ions additives and organic nitrogen compounds on the yield of 2,6-naphthalic acid were discussed. The results shown that influence order for the yield of 2,6-naphthalic acid in the
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Haworth,Letsky,Mavin
, p. 1784,1791 (1932)
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Preparation method of dimethyl 2, 6-naphthalate
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, (2021/06/02)
The invention discloses a preparation method of dimethyl 2, 6-naphthalate. Specifically, the preparation method of the dimethyl 2, 6-naphthalate disclosed by the invention comprises the following steps: carrying out esterification reaction on 2, 6-naphthalic acid and methanol under a pressurization condition in the presence of a catalyst, and filtering without further purification to obtain the dimethyl 2, 6-naphthalate, wherein the mass ratio of the methanol to the 2, 6-naphthalic acid is (3: 1)-(25: 1), the reaction temperature ranges from 100 DEG C to 150 DEG C. According to the preparation method disclosed by the invention, the operation is simplified, the yield of the dimethyl 2, 6-naphthalate is improved, and meanwhile, the purity of the dimethyl 2, 6-naphthalate is maintained.
Method for preparing aromatic carboxylic acid compound
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Paragraph 0141-0143; 0156-0158; 0177, (2020/02/14)
The invention discloses a method for preparing an aromatic carboxylic acid compound. The method comprises the following steps: 1) heating carbon dioxide and hydrosilane in the presence of a copper catalyst in a reaction medium A; and 2) adding a reaction medium B, aryl halide, a palladium catalyst and a base to the reaction mixture in the step 1), sealing the reaction system, and performing a heating reaction. The method has the advantages that raw materials are simple and easy to obtain, the raw materials are cheap and stable, the catalyst is common, easy to obtain and stable, the reaction conditionsaremild, the aftertreatment is simple, the yield is high, and the like.
Method for preparing high-purity naphthalic acid by taking beta-methylnaphthalene as raw material
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Paragraph 0032; 0034; 0035; 0037; 0038; 0040, (2019/10/01)
The invention discloses a method for preparing high-purity naphthalic acid by taking beta-methylnaphthalene as a raw material. The method comprises the following steps of (1) preparation of an acylation solution, wherein propionyl chloride is added into nitrobenzene and anhydrous aluminium trichloride, and it is controlled that the temperature is below 0 DEG C, so that a mixed solution is mixed into a uniform and transparent solution; (2) an acylation reaction, wherein the acylation solution obtained in step (1) is added into a nitrobenzene solution of 2-methylnaphthalene dropwise, it is controlled that the temperature is below 0 DEG C, and the acylation reaction is carried out; (3) hydrolysis of an acylate, wherein distilled water is added into the product obtained in step (2) for cleaning until the pH value of a mixed solution is 6-7; (4) reduced pressure distillation, wherein the product obtained in step (3) is subjected to reduced pressure distillation, the acylate flows out at 165-180 DEG C, cooling is carried out, and a white solid is obtained; (5) purification of the acylate, wherein the product obtained in step (4) is purified by using a recrystallization method, 2-methyl-6-propiononaphthone is obtained, and vacuum drying is carried out; (6) an oxidation reaction, wherein the product obtained in step (5) is synthesized into 2,6-NDA through an air liquid phase oxidationreaction technology.