2215-89-6Relevant articles and documents
Synthesis method of 4,4'-diphenyl ether dicarboxylic acid
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, (2020/05/01)
The invention discloses a 4,4'-diphenyl ether dicarboxylic acid synthesis method, which comprises: S1, carrying out a dehydration reaction on p-hydroxybenzoate, an alkali and a solvent at a temperature of 110-120 DEG C for 2-4 h under a protection gas to obtain a mixed solution; S2, adding a catalyst and p-halo benzoate into the mixed solution obtained in the step S1, carrying out a heating coupling reaction at a reaction temperature of 145-195 DEG C, adding a solvent after the reaction is finished, and performing extraction, liquid separation and crystallization to obtain a solid 4,4'-diphenyl ether dicarboxylic acid diester; and S3, carrying out heating hydrolyzing on the 4,4'-diphenyl ether dicarboxylic acid diester obtained in the step S2 in an aqueous alkali solution and a solvent, adding an acid to adjust the pH value to be acidic, and carrying out crystallization and filtration to obtain the 4,4'-diphenyl ether dicarboxylic acid. The method is simple in process operation, low inequipment requirement, high in product purity, less in three wastes generated in the production process, environment-friendly and high in industrial feasibility, and the total yield of the two-step reaction can reach more than 80%.
Method for preparation of 4, 4'-oxybisbenzoic acid by catalytic oxidation of Anderson type polyacid
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Paragraph 0034; 0036; 0038; 0040; 0042, (2018/09/20)
The invention discloses a method for preparation of 4, 4'-oxybisbenzoic acid by catalytic oxidation of Anderson type polyacid. The specific steps include: 1) subjecting di-p-tolyl ether, a heteropolyacid catalyst, an oxidant and an additive to oxidation reaction in a solvent; 2) at the end of the oxidation reaction, filtering out the heteropolyacid catalyst, and performing extraction to obtain anorganic phase and an aqueous phase; and 3) carrying out drying, filtering, concentration and purification on the organic phase in order to obtain 4, 4'-oxybisbenzoic acid, wherein the heteropolyacid catalyst is an Anderson polyacid parent or Anderson polyacid modified parent. The method provided by the invention adopts Anderson polyacid as the catalyst, which has the characteristics of high reaction activity, mild reaction conditions, environmental friendliness, high specificity and selectivity, recyclability, and is suitable for industrial production. Hydrogen peroxide, air or oxygen is adopted as the oxidant, can lower the cost, and also can reduce the emissions of three wastes and alleviate environmental protection pressure.
Facile aerobic photooxidation of methyl group in the aromatic nucleus in the presence of an organocatalyst under VIS irradiation
Tada, Norihiro,Hattori, Kasumi,Nobuta, Tomoya,Miura, Tsuyoshi,Itoh, Akichika
supporting information; experimental part, p. 1669 - 1671 (2011/08/10)
We report a useful method for a facile synthesis of carboxylic acids from methyl aromatics by aerobic photooxidation using VIS irradiation and easily handled 2-chloroanthraquinone as organic catalysts under mild conditions such as an air atmosphere and ambient pressure and temperature. This is a more environmentally benign oxidation than previous methods, which require drastic reaction conditions.