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In other method, 5-chloro-2,4-disulfamyl-aniline (II) is reac ...

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[9] In other method, 5-chloro-2,4-disulfamyl-aniline (II) is reacted with paraformaldehyde in the presence of a mineral acid and a solvent. The mineral acid is selected from hydrochloric acid, hydrobromic acid and sulfuric acid. Hydrochlorothiazide obtained is recrystallized from water. However, the yield obtained by this process is only 46.3% which makes the process less attractive at an industrial scale. Moreover repeating this experiment, it is found that it results in the formation of dimer impurity along with Hydrochlorothiazide which is difficult to remove by conventional purification methods.

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In other method, 5-chloro-2,4-disulfamyl-aniline (II) is reac ...

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