Process for the preparation of aromatic sulfonyl chlorides

Details Process for the preparation of aromatic sulfonyl chlorides Process for the preparation of aromatic sulfonyl chlorides

C - Chemistry, Metallurgy

07

C

260/311.1, 260/5

C07C 303/04 (2006.01) C07C 303/08 (2006.01) C07C 309/86 (2006.01) C07D 263/56 (2006.01) C07D 263/58 (2006.01) C07C 309/88 (2006.01) C07C 309/89 (2006.01)

Patent

CA 2019071

HOE 89/F 187 Abstract of the disclosure Process for the preparation of aromatic sulfonyl chlorides A process for the preparation of aromatic sulfonyl chlorides of the formula I Image in which R1, R2 and R3 are identical or different and are hydrogen, fluorine, chlorine, bromine or iodine atoms, alkyl(C1-C4), acetamido, nitro or carboxyl groups, or R1 and R2 together form an aromatic or heteroaromatic ring having 5 or 6 ring members, which can be substituted by fluorine, chlorine, bromine or iodine atoms, alkyl(C1-C4), acetamido, nitro or carboxyl groups, by reaction of aromatic compounds of the formula II Image in which R1, R2 and R3 have the abovementioned meanings, with chlorosulfonic acid in excess or with chlorosulfonic acid or oleum and thionyl chloride, by reacting in the presence of sulfamic acid as a catalyst.

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