Chlorine → Benzenesulfonic acid, 3,5-dichloro-2-hydroxy-4-methyl-

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In a process for preparing 2-nitro-4,6-dichloro-5-methylphenol by sulfonation of 4-chloro-5-methylphenol to form 2-sulfo-4-chloro-5-methylphenol followed by chlorination of the 2-sulfo-4-chloro-5-methylphenol to 2-sulfo-4,6-dichloro-5-methylphenol with subsequent reaction of the 2-sulfo-4,6dichloro-5-methylphenol with nitric acid, the improvement which comprises carrying out the sulfonation at 40-100° C. with concentrated sulfuric acid to form 2-sulfo-4-chloro-5-methylphenol, thereafter diluting the reaction mixture with water to sulfuric acid content of 20 to 30 percent, chlorinating the resulting 2-sulfo-4-chloro-5-methylphenol with chlorine at 45-60° C. under a pressure of 1-3 bars gauge pressure to form 2-sulfo-4,6-dichloro-5-methylphenol.

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