3260-87-5Relevant articles and documents
Method for synthesizing 3 - halogen -2 -alkyl phenol
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Paragraph 0042-0044, (2021/11/03)
The invention discloses a synthesis method of 3 -halo -2 - alkyl phenol, and belongs to the technical field of organic synthesis. At 2, 6 - dihaloalkylbenzene is used as starting material, nucleophilic substitution with dibenzyl alcohol in the presence of an inorganic base followed Pd / C hydrodebenzylation or Grignard exchange with magnesium metal in the presence of n-butylbromide/chloride followed by air/oxygen to give 3 - halo -2 - alkylphenols. The method has the advantages of high regioselectivity, good yield, simple operation process and the like, and the product purity can reach 99.5% or more.
Method for synthesizing 2,6-dihydroxytoluene by using waste acid
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Paragraph 0022; 0024, (2021/08/07)
The invention discloses a method for synthesizing 2,6-dihydroxytoluene by using waste acid mechanically. According to the method, 3-chloro-2-methylaniline is taken as a raw material, an intermediate 3-chloro-2-methylphenol is synthesized through diazotization and hydrolysis, the reaction is optimized in the alkali fusion, acidification and refining processes, the mechanical application of waste acid and a solvent in the reaction and the optimization of a refining scheme are emphatically optimized, the yield is effectively improved, three wastes are reduced, and 2,6-dihydroxytoluene is synthesized. The method provided by the invention greatly reduces the generation of acidic wastewater, better meets the requirement of environmental protection, and effectively increases the yield of the product, and the quality of the product reaches 99.0-99.5%.
Process for the preparation of phenols
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Paragraph 0026, (2017/01/12)
The present invention relates to a process for the preparation of phenols in which an aryldiazonium salt, which is prepared by the diazotization of a corresponding aromatic, primary amine, by heating in a mixture comprising hot water, a mineral acid and an organic solvent, is decomposed, where the organic solvent comprises a ketone of the formula (I) R1C(O)R2, in which R1 and R2, independently of one another, are (C1-C5)-alkyl and R1 and R2 together have at least four carbon atoms, where the aromatic primary amine is aniline or a substituted aniline which comprises at least one further substituent which is selected from: alkyl, alkenyl, alkynyl, halogen, haloalkyl, cycloalkyl, heteroalkyl, carboxyl, cyano, alkoxy and ester, and where essentially no copper salts are present in the mixture.