- Method for recycling byproducts in synthesis of diphenyl sulfide compound
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The invention provides a method for recycling byproducts in synthesis of a diphenyl sulfide compound. The byproducts comprise alkyl alcohol and dimethyl disulfide. The method comprises the steps of (1) mixing the byproducts in synthesis of the diphenyl sulfide compound with a sodium nitrite aqueous solution, adding concentrated hydrochloric acid for reaction, and obtaining alkyl nitrite and dimethyl disulfide; and (2) mixing the products obtained in the step (1) with copper powder, adding an aniline compound for reaction, carrying out desolvation treatment on the obtained reaction solution toobtain a diphenyl sulfide compound and byproducts, and returning the byproducts to the step (1). According to the recycling method, the byproducts do not need to be separated, the byproducts serve asraw materials to be directly applied to synthesis of the diphenyl sulfide compound, the process steps are simple and safe, cyclic utilization of the materials is achieved, and the raw material cost ofindustrial production of the diphenyl sulfide compound and the treatment cost of industrial three wastes are remarkably reduced.
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Paragraph 0067; 0071-0073
(2021/03/30)
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- Synthesis method of 2-alkylthio-6-halogenated alkylbenzene
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The invention provides a synthesis method of 2-alkylthio-6-halogenated alkylbenzene. The synthesis method takes halogenated toluene and an alkyl mercaptan metal compound as raw materials and ionic liquid as a solvent for reaction to prepare the 2-alkylthio-6-halogenated alkylbenzene, is free of solvent pollution, can effectively control the generation of wastewater, and is easy in post-treatment process and solvent recovery. The product can be directly obtained through simple reduced pressure distillation, and the method is more beneficial to experiment or production operation and improvementof product quality.
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Paragraph 0039-0044
(2020/06/20)
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- Method for preparing 2-chloro-6-methylthio methylbenzene
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The invention discloses a method for preparing 2-chloro-6-methylthio methylbenzene. The method adopts 2-chloro-6-amino methylbenzene and sodium thiomethoxide aqueous solution as raw materials, and generates 2-chloro-6-methylthio methylbenzene by diazotization. The method for preparing 2-chloro-6-methylthio methylbenzene provided by the invention overcomes the shortcomings of using 2,6-dichloro toluene as the raw material, using hexamethyl phosphoryl triamide with high polarity and high toxicity as a solvent, and using sodium thiomethoxide solid reagent which is harmful to the environment and inconvenient to use in a traditional synthesis method. Meanwhile, the method provided by the invention also solves the problem that the hexamethyl phosphoryl triamide solvent in 2-chloro-6-methylthio methylbenzene synthesized in the traditional method is difficult to recycle, and the problem of high costs and large environmental pollution and the like. The preparation method provided by the invention has the advantages of low cost, easy operation, less pollution, safety and environmental protection and the like; and the preparation method is suitable for large-scale industrialized production.
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Paragraph 0021; 0023; 0024; 0026; 0027; 0029; 0030; 0032
(2019/01/08)
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- Preparation method of 2-chloro-6-methylthiotoluene
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The invention discloses a preparation method of 2-chloro-6-methylthiotoluene and relates to the technical field of fine chemicals. The preparation method comprises the following steps: by taking organic cyclic amine as a catalyst in a non-polar organic solvent, carrying out substitution reaction on raw materials including 2,6-dichlorotoluene and potassium thiomethoxide, so as to generate 2-chloro-6-methylthiotoluene. According to the preparation method provided by the invention, the emission of pollutants in a diazotization reaction route is reduced, the reaction selectivity is high, a few ofthree wastes are discharged and the post-treatment is simple, so that the preparation method is suitable for industrialized amplification production.
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Page/Page column 5-7
(2019/01/07)
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- Preparation method of 2-methyl-3-chlorophenylmethyl sulfide
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The present invention relates to the technical field of fluorine-containing tri-ketone pesticides and more particularly relates to a preparation method of 2-methyl-3-chlorophenylmethyl sulfide. The method comprises the following steps: 1) methyl sulfidation: 2-methyl-3-chloroaniline and methanthiol metal salts are refluxed in a solvent to synthesize 2-methyl-3-methylthio benzenamine; and 2) diazotization and chlorination: the 2-methyl-3-methylthio benzenamine is subjected to the diazotization and chlorination to synthesize the 2-methyl-3-chlorophenylmethyl sulfide. In each step of the chemical reactions, only one group of the used raw materials can conduct the reaction, so that the preparation method fundamentally avoids formation of impurities and thus improves the yield and purity of the products. The content of the prepared intermediate 2-methyl-3-chlorophenylmethyl sulfide of tembotrione is larger than or equal to 95%, the yield accounted as 2-methyl-3-methylthio benzenamine is larger than or equal to 90%, the raw materials are easy to obtain and the preparation method is easy to achieve in the industry.
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Paragraph 0027; 0028; 0029; 0032
(2017/08/28)
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- Benzoyl compound, composition containing benzoyl compound and application of benzoyl compound
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The invention discloses a benzoyl compound, a composition containing the benzoyl compound and application of the benzoyl compound. The formula of the benzoyl compound is as shown in the specification, wherein A, B, X and R are as defined in the specification. The benzoyl compound has high growth inhibition activity on various broad-leaf weeds and gramineae weeds, has no evident phytotoxicity on wheat, has good crop safety, and is few in synthesizing steps, simple in preparation method, low in preparation cost and suitable for large-scale industrial production.
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Paragraph 0078; 0079; 0080
(2016/11/14)
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- Benzoylcyclohexanediones, process for their preparation and their use as herbicides and plant growth regulators
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Benzoylcyclohexanediones of the formula (I), process for their preparation and their use as herbicides and plant growth regulators are described. In this formula (I), R11, R2, R3, R4, R5, R6and R7are various radicals, L is an alkylene chain, and Y and Z are a monoatomic bridge element.
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- Isoxazolyl- and isoxazolinyl-substituted benzoylcyclohexanediones, process for their preparation and their use as herbicides and plant growth regulators
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Isoxazolyl- and isoxazolinyl-substituted benzoylcyclohexanediones, process for their preparation and their use as herbicides and plant growth regulators. Benzoylcyclohexanediones of the formula (I), process for their preparation and their use as herbicides and plant growth regulators are described. In formula (I) R1, R2, R3, R4, R5, R6, R7, Ra, Rb, and Rcare various radicals and Y and Z are a monoatomic bridge element.
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- Process for producing 4-benzoyl-5-hydroxypyrazoles
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A process for producing a 4-benzoyl-5-hydroxylpyrazole of the formula III: STR1 which comprises reacting carbon monoxide and a 5-hydroxypyrazole of the formula II: STR2 to a substituted benzene of the formula I: STR3 wherein X is a bromine atom, an iodine atom or a diazonium tetrafluoroboron salt group, in the presence of a base and a catalyst of Group VIII of the Periodic Table.
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