Process for the preparation of 5-fluorotoluene-2,4-...

Details Process for the preparation of 5-fluorotoluene-2,4-... Process for the preparation of 5-fluorotoluene-2,4-...

C - Chemistry, Metallurgy

07

C

260/538.2

C07C 309/86 (2006.01) C07D 215/56 (2006.01)

Patent

CA 1283424

Process for the preparation of 5-fluorotoluene-2,4- disulphochloride ABSTRACT OF THE DISCLOSURE 5-Fluorotoluene-2,4-disulphochloride is prepared by chlorosulphonation of 3-fluorstoluene by first reac- ting the 3-fluorotoluene with chlorosulphonic acid and then with an inorganic acid chloride at temperatures up to 130°C until the evolution of gas is complete, and then heating the reaction mixture at temperatures of up to 200°C and, after ehe completion of the gas evolution, reacting the product at a lower temperature with further inorganic acid chloride, or reacting the 3-fluorotoluene with powerful sulphonating agents at an elevated tempera- ture, if appropriate in the presence of inert solvents and/or diluents, to give the corresponding disulphonic acid and then ereating ehe disulphonic acid with inorganic acid chlorides.

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