| abstract |
The present invention provides a method capable of producing a sulfonic acid chloride from a sulfonic acid or a salt thereof with good yield and good operability. SOLUTION: Formula (1) Produces sulfonic acid chloride by reacting sulfonic acid or its salt with chlorinating agent such as phosgene, phosphorus oxychloride, thionyl chloride in a solvent consisting of aliphatic nitrile or alicyclic nitrile that can be separated from water. To do. This reaction may be performed in the presence of a catalyst such as an N, N-disubstituted amide, a nitrogen-containing heteroaromatic compound, or a tertiary amine. [Selection figure] None |