The conversion accompanied by the liberation of sulfurous acid was attempted on the compounds of NO₂-C₆H₄-SO₂-NH-CO-R (p-and o-NO₂) type with sodium hydroxide or carbonate. Such conversion was found to occur in the compound with R=CN to form α-(nitrophenyl)-α-cyanoacetamide; p-nitro compound, m.p. 135°, and o-nitro compound, m.p. 171-171.5° (decomp): in the case of R=COOC₂H₅, p-nitrophenylacetamide; and in the case of R=C₆H₅, p-nitrodiphenylacetamide, m.p. 142-144°, and 3-phenyl-indazole, m.p. 107-109°.