Alternatively, the alpha-haloketone of the formula II can be reacted with a salt of an N-R³ arylsulphonamide, preferably an N-R³ toluenesulphonamide
of the formula
(in which R³ is as hereinbefore defined), with formation of a potassium halide, e.g., potassium bromide, and an intermediate which can be hydrolysed,
e.g., under reflux for several hours with concentrated hydrochloric acid, to the compound of formula I and an arylsulphonic acid.
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