| 摘要 |
NEW MATERIAL:A 1,3,4-thiadiazole derivative expressed by the formula (M1 and M2 are independently H, alkali metal or alkaline earth metal) and a salt thereof. EXAMPLE:Dipotassium salt of 5-mercapto-3-(4-sulfonyl)-2-thio-1,3,4-thiadiazole. USE:A chelating agent, very readily soluble in water due to sulfonic acid group thereof and high reaction rate with heavy metal ions or Se(IV), etc., and particularly advantageous to use by fixing on anion exchange resins. PREPARATION:Phenylhydrazonesulfonic acid is dissolved in an aqueous solution of caustic soda or caustic potash, etc., and carbon disulfide is added to the resultant solution. The reaction solution is then refluxed under heating to give the aimed compound expressed by the formula in almost quantitative yield.
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