105827-91-6Relevant articles and documents
Synthesis, characterization and crystal structure of n-(3-((2-chlorothiazol-5-yl)methyl)-5-methyl-1,3,5-oxadiazinan-4-ylidene)nitramide
He, Jian-Ling,Cheng, Wei-Hua
, p. 2383 - 2385 (2015)
N-(3-[(2-chlorothiazol-5-yl)methyl]-5-methyl-1,3,5-oxadiazinan-4-ylidene)nitramide (I), i.e., thiamethoxam, it is a broad-spectrum insecticide that effectively controls insects, being a second generation neonicotinoid compound belonging to the chemical subclass the thianicotinyls. It was prepared from 5-(chloromethyl)-2-(phenylthio)thiazole (1) via chlorination by Cl2/HCl system and then condensation by K2CO3/CsI. The product was characterized by NMR and LC-MS. The crystal structure of compound I was investigated using X-ray diffraction and SHELXTL-97 software. The result indicated that compound I crystallized in the monoclinic system, space group P 21/n with a = 6.488(13), b = 28.786 (6), c = 6.804(14) ?, V=1225.1 (5) ?3; Z4.
Synthesis method of 2-chloro-5-chloromethylthiazole by photocatalytic chlorination
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Paragraph 0023-0032, (2021/04/17)
The invention relates to the technical field of synthesis of 2-chloro-5-chloromethylthiazole, and provides a synthesis method of 2-chloro-5-chloromethylthiazole by photocatalytic chlorination, which comprises the following steps: S1. adding 2-chloropropenyl thioisocyanate, sulfonyl chloride and acetonitrile into a tower reactor, and stirring to dissolve; S2, adding a catalyst, irradiating with ultraviolet light, and starting chlorination reaction; S3, carrying out reduced pressure distillation to remove the solvent acetonitrile; S4, dissolving distilled residues in dichloromethane, respectively washing with a NaHCO3 solution and water to be neutral, and carrying out reduced pressure distillation to obtain a 2-chloro-5-chloro methylthiazole product. Through the technical scheme, the problems of poor product quality and low yield in the prior art are solved.
Tower reactor preparation 2 chloro -5 chloro - methylthiazole
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Paragraph 0021; 0024-0026; 0029-0031; 0034-0035; 0038; ..., (2021/11/10)
The invention relates to the technical field 2 chlorine -5 chlorine - methylthiazole preparation, in particular to a tower reactor for preparing 2 chloro -5 chloro - methylthiazole, which comprises the following steps: S1. The sodium thiocyanate and the catalyst tetrabutylammonium bromide are added into the tower reactor, and then are metered into 2, 3 - dichloropropene and toluene respectively, stirred and heated to reflux. S2, followed by addition of tetrabutylammonium bromide, and isomerization reaction was performed after the temperature increase, and after completion of the reaction, negative pressure distillation was performed to obtain 2 - chloroallyl isothiocyanate. To the method, pollution to the environment can be reduced, hydrogen chloride gas generated in the reaction process can be reused, and the problem that the color of the product 2 chlorine -5 chlorine - methyl thiazole is too deep can be solved.