X‐ray investigations of sulfur‐containing fungicides. IV. 4′‐{[Benzoyl(4‐chlorophenylhydrazono)methyl]sulfonyl}acetanilide and 4′‐{[benzoyl(4‐methoxyphenylhydrazono)methyl]sulfonyl}acetanilide

The conformations of the two approximately isomorphous structures 4′‐{[benzoyl(4‐chloro­phenyl­hydrazono)­methyl]­sul­fonyl}acetanilide, C₂₂H₁₈ClN₃O₄S, and 4′‐{[benzoyl(4‐meth­oxy­phenyl­hydrazono)­methyl]­sulfonyl}acetanilide, C₂₃H₂₁N₃­O₅S, are stabilized by resonance‐assisted intramolecular hydrogen bonds linking the hydrazone moieties and sulfonyl groups. The stronger bond is observed in the former compound. The difference in electronic properties between the Cl atom and the methoxy group is too small to significantly alter the non‐bonding interactions of the sulfonyl and β‐­carbonyl groups.