| 摘要 |
An improved process for the preparation of a sulphonic acid chloride of the formula <IMAGE> (I) wherein R1, R2 and R3 are identical or different and denote hydrogen, a lower alkyl radical or a cycloalkyl radical, halogen, aryl, aralkyl, aryl ether or a radical -SO2Cl, -SO2aryl, <IMAGE> or +TR <IMAGE> or wherein adjacent radicals R1 and R2 are linked to form a cycloaliphatic, aromatic or hetero-aromatic ring which is optionally substituted by a sulphonic acid chloride group by contacting an aromatic compound of the formula <IMAGE> wherein R1, R2 and R3 of the above-mentioned meaning, with chlorosulphonic acid and thionyl chloride, the improvement residing in employing initially approximately stoichiometric amounts of aromatic compound and chlorosulphonic acid, effecting reaction of the aromatic compound and chlorosulphonic acid and thereafter contacting the reaction product with excess thionyl chloride.
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