Sulfuric Acid → 5-Chloro-2-hydroxy-4-methylbenzenesulfonic acid

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Reaction Steps

According to the present invention there is provided a process for preparing 2-nitro-4,6-dichloro-5-methylphenol comprising sulphonation of 4-chloro-5-methyl-phenol with concentrated sulphuric acid at elevated temperature to form 2-sulpho-4-chloro-5-methylphenol, thereafter diluting the reaction mixture with water to a sulphuric acid content of 20 to 30%, chlorinating the resulting 2-sulpho-4-chloro-5-methylphenol with chlorine at elevated temperature and normal or elevated pressure to form 2-sulpho-4,6-dichloro-5-methylphenol and reacting the 2-sulpho-4,6-dichloro-5-methylphenol with nitric acid.

Provenance & Evidence