Process for preparing 2-alkyl-5-haloacetylbenzenesulfonamide represented by the general formula (1), ##STR1## (wherein R.sup.1 is an alkyl group having 1 to 5 carbon atoms; and X is a chlorine atom, bromine atom or iodine atom), characterized by halogenating a 5-acetyl-2-alkylbenzenesulfonamide represented by the general formula (2), ##STR2## (wherein R.sup.1 is the same as defined above) in a lower alcohol represented by the general formula (3), R.sup.4 --OH (wherein R.sup.4 is an alkyl group having 1 to 5 carbon atoms).
制备一般式(1)所表示的2-烷基-5-卤代乙酰基苯磺酰胺的过程,其中R1是具有1至5个碳原子的烷基基团,X是
氯原子、
溴原子或
碘原子,其特征在于在一般式(2)所表示的5-乙酰基-2-烷基苯磺酰胺中卤代化,所述5-乙酰基-2-烷基苯磺酰胺在一般式(3)所表示的低级醇中,R4-OH(其中R4是具有1至5个碳原子的烷基基团)。