Reductive colour removal

Sulfinic acid derivatives (I), are new. Sulfinic acid derivatives of formula (I), are new. R : a peptide derivative, alkyl compound of formula (R 2>-C(Y 1>)(R 1>)-), (M 1>-SO-C(Y 2>)(R 14>)-X-C(Y 1>)(R 1>)-), R 10>-NH-CO-, R 13>-SO 2-NH-C(R 11>)(R 12>)- or a phenyl compound of formula (IV); Y 1>, Y 2>OH, -NH 2group or -NR 3>R 4>; R 3>, R 4>1-6C alkyl, 2-6C alkenyl, 1-6C (hydroxy)alkyl, 2-6C polyhydroxyalkyl, aryl or aryl-1-6C alkyl; X : a direct bond or an organic residue with two free valency; either R 1>, R 14>H or 1-6C alkyl; and R 2>substituted aliphatic or aromatic heterocyclic compound, carboxy-1-6C alkyl, N,N,N-tri(1-6C alkyl)ammonium-1-6C alkyl, carboxy-2-6C alkenyl, cyano-1-6C alkyl or 1-6C alkoxycarbonyl-1-6C alkyl or (IV); or R 1>R 2>aliphatic 5-7-membered ring containing at least a cationic, quaternary nitrogen atom as a heteroatom, where the cationic load is compensated optionally through an equivalent mono- or polyvalent anions; R 7>carboxy group, sulfonic acid group, 1-6C alkoxycarbonyl, sulfonic amid, cyano, nitro, carboxy-1-6C alkyl, carboxy-1-6C alkoxy or an amine group of formula (-N +>RaRbRc); Ra, Rb, Rc : 1-6C alkyl, 2-6C alkenyl, aryl-1-6C alkyl or 1-6C hydroxyalkyl; M, M 1>-M 3>H or an equivalent of mono- or polyvalent cation; R 8>, R 9>H, 1-6C alkyl, 2-6C alkenyl, 1-6C hydroxyalkyl, 2-6C polyhydroxyalkyl, 1-6C alkoxy, OH, amino, carboxy, nitro, cyano or halo; R 10>1-6C alkyl, optionally substituted aryl, optionally substituted heteroaryl, carboxy-1-6C alkyl, carboxy-2-6C alkenyl, 1-6C alkoxycarbonyl or 1-6C alkoxycarbonyl-1-6C alkyl; and R 11>-R 13>H, 1-6C alkyl, 2-6C alkenyl, perfluorinated 1-6C alkyl, 3-6C cycloalkyl, optionally substituted (hetero)aryl, 1-6C hydroxyalkyl, 2-6C polyhydroxyalkyl, aryl-1-6C alkyl, carboxy-1-6C alkyl, carboxy-2-6C alkenyl or 1-6C alkoxycarbonyl-1-6C alkyl. Independent claims are included for: (1) an agent (A) comprising (I) in a carrier; and (2) a procedure to the reductive decoloration of dyed substrates with natural- and/or synthetic dye comprising applying (A) on the dyed substrate and rinsing after an influential time. [Image].