- Synthesis method of 2-hydroxyl-3,6-dichlorobenzoic acid
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The invention discloses a synthesis method of 2-hydroxyl-3,6-dichlorobenzoic acid. The synthesis method of the 2-hydroxyl-3,6-dichlorobenzoic acid comprises the following step: under existence of protective gas, carrying out nucleophilic substitution reaction in methanol to obtain a compound 1. The method has the advantages that the raw materials are readily available, the amount of wastewater produced in a reaction process is relatively small, the process is simple, and the purity of a product is high.
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Paragraph 0079; 0084; 0085; 0086; 0093
(2018/05/16)
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- A preparing method of 2-methoxy-3,6-dichlorobenzoic acid
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A preparing method of 2-methoxy-3,6-dichlorobenzoic acid is disclosed. The preparing method includes etherifying 2,3,6-trichlorobenzoic acid in methanol under action of sodium methoxide to prepare the 2-methoxy-3,6-dichlorobenzoic acid, wherein the mole ratio of the 2,3,6-trichlorobenzoic acid to the sodium methoxide is 1:1-1:10. The preparing method also includes a step of subjecting a compound shown as a formula 2 to chlorination, tertiary butyl or sulfo group removing and oxidation to prepare the 2,3,6-trichlorobenzoic acid. The preparing method is simple in operation, low in raw material cost, low in production cost, convenient in after-treatment, mild in reaction conditions, environmental friendly, high in yield, short in reaction time and suitable for industrial production.
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- A 2, 3, 6-trichloro toluene synthesis method (by machine translation)
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The invention discloses a 2, 3, 6-trichloro toluene synthesis method. The present invention provides a 2, 3, 6-trichloro toluene synthesis method, comprising the following steps: the presence of a catalyst, the 2,6-dichloro-toluene reagent for a chlorination reaction with the chloride to obtain 2, 3, 6-trichloro toluene, the catalyst is a metal and/or metal halide. The synthetic method of this invention simple preparation method, high yield, high selectivity, high purity of the prepared product, raw material is cheap, low production cost, is suitable for industrial production. (by machine translation)
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Paragraph 0030; 0031
(2017/01/17)
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- 3,6-dichloro-2-methoxybenzoic acid and wherein the intermediate synthesis method (by machine translation)
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The invention discloses 3,6-dichloro-2-methoxybenzoic acid and wherein the intermediate synthesis method. The present invention provides a 2, 3, 6-trichlorobenzoic acid synthesis method, comprising the following steps: the presence of a catalyst, the 2, 3, 6-trichloro toluene and oxidizing reagent to perform oxidation reaction, is 2, 3, 6-trichloro-benzoic acid. The synthetic method of this invention simple reaction steps, the conversion is high, high yield, good purity of the prepared product, low production cost, environment-friendly, is suitable for industrial production. (by machine translation)
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Paragraph 0095; 0096
(2017/01/23)
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