Camphor-10-sulfonyl chloride (1) reacts with hydrazine to give the hydrazide (2), if the reaction is prolonged the benzothiadiazine dioxide (3) is obtained.p-Succinimidobenzenesulfonyl chloride (9) with hydrazine (1 mol.) gave the hydrazide (10), but with excess hydrazine the amide ring was opened to give the bis-hydrazide (13). Anisamide (23) was converted to the chloride (24) and the dimethylamide (25) and acetone hydrazone (26). Reaction of the hydrazide with anisaldehyde gave the 4,4′-dimethoxybenzalazine (27). 2-Acetoxyacetanilide (28) with chlorosulfonic acid afforded a mixture of 4-acetamido-3-hydroxy-and 3-acetamido-4-hydroxy-benzenesulfonyl chlorides (29,30). Chlorosulfonation of 4-acetoxyacetanilide gave the sulfonyl chloride, but with 3-acetoxyacetanilide no pure product was isolated.