| 摘要 |
An improvement in a process for the preparation of a sulphonic acid chloride of the formula <IMAGE> (I) wherein R1, R2 and R3 are independently hydrogen, a lower alkyl radical or a cycloalkyl radical, halogen, aryl, aralkyl, aryl ether or a radical -SO2Cl, -SO2-aryl <IMAGE> +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 wherein an aromatic compound of the formula <IMAGE> (II) wherein R1, R2 and R3 have the above-identified meanings is reacted initially with chlorosulphonic acid and thereafter the reaction product is reacted with phosgene in the presence of a catalyst.
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