873012-43-2Relevant articles and documents
Triazole compound containing dioxolame and preparation method of intermediate of triazole compound
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, (2021/09/04)
The invention relates to a preparation method of a dioxolane-containing triazole compound and an intermediate thereof, and the method comprises the following steps: reacting a compound shown as a formula (V) with a compound shown as a formula (IV) in the presence of Lewis acid to prepare a compound shown as a formula (III); reacting the compound shown in the formula (III) with a compound shown in the formula (II) to prepare the compound shown in the formula (I). According to the technical scheme, a triazole group is introduced into 1H-1, 2, 4-triazole-1-acetic acid, generation of an isomer 1, 3, 4-triazole byproduct is avoided, the reaction yield is increased, and the method has the advantages of being simple and convenient in process route, few in reaction step, simple in process, low in production cost, environmentally friendly, green and safe; the post-treatment of the product only needs a simple solvent crystallization process, a nitric acid salifying method and a high-temperature distillation method do not need to be adopted, the requirements on equipment are reduced and the cost is reduced under the condition of improving the yield and content of the product, and the method is suitable for industrial production.
Method for synthesizing high-purity difenoconazole
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, (2021/02/10)
The invention discloses a method for synthesizing high-purity difenoconazole, which comprises the following steps: 1) carrying out acylation reaction on 3,4'-dichlorodiphenyl ether to obtain an intermediate I; 2) performing cyclization reaction on the intermediate I to obtain an intermediate II; 3) brominating 1,2,4-triazole to prepare a 1,2,-4-triazole bromide; 4) carrying out bromination reaction on the intermediate II and 1,2,4-triazole bromide to obtain an intermediate III and triazole, and carrying out condensation reaction on the intermediate III and 1,2,4-triazole under the action of potassium hydroxide to obtain a difenoconazole crude product; and 5) refining the difenoconazole crude product to obtain a difenoconazole refined product. The method is low in cost, high in quality andhigh in yield, dibromo and hydrolysis byproducts are hardly generated, and the product content and appearance quality of the difenoconazole refined product are improved.
Method for converting 4 - H difenoconazole isomer into 1 - H-difenoconazole (by machine translation)
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Paragraph 0033-0046, (2020/07/21)
A method for converting 4 - H-difenoconazole isomer into 1 - H-difenoconazole isomer to obtain an alcohol, 2) reaction of the alcohol and hydrobromic acid to obtain a bromide; 3) separating 1 difenoconazole and 4 - H) 1 - H) from the mixture of 4 - H-difenoconazole and 1 - H-difenoconazole isomer; 4) completely converting 4 - H-difenoconazole isomer into 4 - H-phenylene difenoconazole.) isomer is obtained by dissolving 1) difenoconazole and difenoconazole as a mixture in the presence of a base and a transition metal catalyst to obtain a mixture of difenoconazole and difenoconazole -4 4 - H 1 - H. The method not only can effectively reduce the solid waste problem 4 - H difenoconazole isomer, but also can convert the difenoconazole product into 1 - H difenoconazole product, so that the cost is reduced, the product yield is increased, and the economic benefit is improved. (by machine translation)
Preparation method of substituted diphenyl ether bromide
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Paragraph 0008; 0043-0048; 0052-0054, (2020/09/09)
The invention relates to a preparation method of a substituted diphenyl ether bromide, which comprises the following steps: adding a substituted diphenyl ether compound and bromine into a micro-reactor, and carrying out continuous reaction to prepare the diphenyl ether compound of which the methyl hydrogen atom is substituted by bromine. According to the technical scheme, a modular micro-channel reaction device is adopted, so that the mass transfer and heat transfer efficiency is high, raw materials are instantly and fully mixed, the reaction rate is increased, the selectivity is improved, thereaction time is greatly shortened, and the production efficiency is improved; continuous production operation can be achieved, the product quality stability is improved, the equipment integration degree is high, and the occupied space can be reduced; and the product is high in yield and purity.