38642-74-9, Chemistry is the experimental and theoretical study of materials on their properties at both the macroscopic and microscopic levels.In a patent£¬Which mentioned a new discovery about 38642-74-9
An environment-friendly 2 – cyano phenothiazine industrial preparation method (by machine translation)
This invention provides an environment-friendly 2 – cyano phenothiazine industrial preparation method, the method uses 2 – chloro phenothiazine and cuprous cyanide as raw materials, to high boiling organic solvent as the solvent, alkali metal halide as a catalyst to the high temperature should, in the refluxing reaction before, under the protection of inert gas, including the raw materials, solvent and catalyst reaction system by azeotropic water, azeotropic water after refluxing reaction, the temperature of the reflux after the completion of the reaction, the reaction product after processing and extraction, to obtain crude, obtained after purification of the 2 – cyano phenothiazine. In order to control the amide impurity, the azeotropic water, avoids the use of phosphorus oxychloride treatment complicated process, while avoiding the use of acyl chloride or concentrated sulfuric acid dehydration to generate highly toxic gas hydrocyanic acid, is conducive to large scale industrial production. Recovery of the 1st organic solvent, can be repeated application, the production cost is reduced. (by machine translation)
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Reference£º
Thiazine – an overview | ScienceDirect Topics,
Thiazine | C4H5NS – PubChem