2105-61-5Relevant articles and documents
Preparation method of fluorine-containing aryl compound
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Paragraph 0093-0101; 0200-0203, (2021/06/12)
The invention relates to the field of organic synthesis, and especially relates to a preparation method of a fluorine-containing aryl compound. The invention provides a preparation method of a compound as shown in a formula 1. The preparation method comprises the following steps: fluorination reaction: reacting a compound as shown in a formula 2 with alkali metal fluoride in the presence of a phase transfer catalyst to prepare the compound as shown in the formula 1. According to the preparation method of the fluorine-containing aryl compound provided by the invention, a reaction system does not contain a solvent, the boiling point of the phase transfer catalyst is relatively high, solvent interference is avoided during rectification or short steaming after the reaction is finished, the distillation yield is high, and the product purity is good.
2. The preparation method of the 4, 5 - trifluorobenzene acetic acid
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Paragraph 0027-0030, (2019/03/23)
The invention discloses a 2, 4, 5 - trifluorobenzene acetic acid preparation method, which belongs to the chemical pharmaceutical intermediates preparation method technical field, the use of 2, 4 - dichlorofluorobenzene as raw materials, by nitration, fluorinated, chlorinated, coupling and hydrolysis reaction for preparing 2, 4, 5 - trifluorobenzene acetic acid. The method of the invention, the raw materials using relatively inexpensive and easy to obtain, the process route is mature, the operation is simple, high yield, and has high industrial value.
Synthetic method for 1,2,4-trifluorobenzene
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Paragraph 0036; 0038, (2019/12/08)
The invention provides a synthetic method for 1,2,4-trifluorobenzene, belongs to the field of pesticide, medicine, and liquid crystal material intermediate preparation, and solves the problem of harshreaction conditions of a current method for synthesizing 1,2,4-trifluorobenzene. The synthetic method for the 1,2,4-trifluorobenzene is characterized by comprising the following steps: performing nitration by using 2,4-dichlorofluorobenzene as a raw material and nitric acid as a nitrating agent to form 2,4-dichloro-5-fluoronitrobenzene in the presence of sulfuric acid; dissolving the 2,4-dichloro-5-fluoronitrobenzene into an organic solvent, adding potassium fluoride and a first catalyst, and performing fluorination under the catalysis of the first catalyst to obtain 2,4,5-trifluoronitrobenzene; dissolving the 2,4,5-trifluoronitrobenzene into a solvent, and performing hydrogenation reduction with hydrogen under the catalysis of a second catalyst to obtain 2,4,5-trifluoroaniline; and performing a reaction on the 2,4,5-trifluoroaniline and sulfuric acid, after a salt is formed, performing a diazotization reaction on the salt and nitroso-sulfuric acid, performing a deamination reductionreaction with sodium hypophosphite under the catalysis of a copper salt, and finally performing steam distillation to obtain the 1,2,4-trifluorobenzene. The method provided by the invention has the advantages of mild reaction conditions and the like
Sequential continuous flow processes for the oxidation of amines and azides by using HOF·MeCN
McPake, Christopher B.,Murray, Christopher B.,Sandford, Graham
experimental part, p. 312 - 319 (2012/06/15)
The generation and use of the highly potent oxidising agent HOF·MeCN in a controlled single continuous flow process is described. Oxidations of amines and azides to corresponding nitrated systems by using fluorine gas, water and acetonitrile by sequential gas-liquid/liquid-liquid continuous flow procedures are reported. Oxidation in flow: The oxidation of amines and azides to the corresponding nitrated systems by using fluorine gas, water and acetonitrile by sequential gas-liquid/liquid-liquid continuous flow procedures are reported. Copyright
Process for preparing multiply fluorinated nitrobenzenes
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, (2008/06/13)
Multiply, preferably doubly or triply, fluorinated nitrobenzenes are prepared in an advantageous way from the corresponding chloronitrobenzenes and an alkali metal fluoride in a chlorine-fluorine exchange reaction by catalyzing the reaction with a quaternary ammonium compound comprising at least one alkoxypolyoxyalkyl radical.
Thieno[3,2-b]-[1,5]benzodiazepines
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, (2008/06/13)
Thieno[1,5]benzodiazepines having useful CNS activity containing the novel tricyclic ring system: STR1 the 10-position being substituted by an amino, preferably a piperazino, group.