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The preparation method of the Clothianidin (by machine translation)
The invention discloses a method for preparing Clothianidin, comprises the following steps: (1) the 1, 5 – dimethyl – 2 – nitro-imino – hexahydro – 1, 3, 5 – triazine, 2 – chloro – 5 – chloromethyl-thiazole and acid in the solvent are added to a reaction, condensation reaction, the reaction liquid obtained; said reaction solvent comprises dimethyl carbonate, methyl isobutyl ketone, ethyl acetate or dichloroethane; (2) in the step (1) by the addition of water in the reaction, condensation reaction of the dissolved salt; (3) and then by step (2) processing the reaction solution adding phosphotungstic acid, the synthesis reaction, filtering, drying the filter residue, to obtain clothianidine. The clothianidine preparation process has simple operation, acidification less reagent consumption can be recycled, the target product yield and content high, mild reaction conditions, less wastes, the raw materials cost and the like. (by machine translation)
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Reference：
Thiazole | C3H2911NS – PubChem,
Thiazole | chemical compound | Britannica