Patent ID: 6649582
Filing Date: 2003-11-18
Classification: C07F,C11D,D06L

Abstract:
A bleach catalyst of formula (IV): wherein Fe represents an iron atom in oxidation state II or III, X is a group which is either a bridge or is not a bridge between iron atoms, Y is a counter-ion, x and y being >=1, 0=1 and R2 being independently one or more ring substituents selected from hydrogen and electron donating and withdrawing groups selected from: halo, C1-6alkoxy, hydroxy, hydroxyalkyl, (optionally mono-or di-substituted) amine groups, (optionally mono- or di-substitued) thiol groups, carboxyl, ester, amide, substituted carbonyl groups in general, nitrile, nitro, (optionally substituted) sulphonyl, alkenyl, aryl, quarternary ammonium (+) and sulphonium (+); R3-R8 being independently hydrogen, alkyl, hydroxyalkyl, alkenyl or variants of any of these when substituted by one or more electron donating or withdrawing groups selected from: halo, C1-6alkoxy, hydroxy, hydroxyalkyl, (optionally mono-or di-substituted) amine groups, (optionally mono- or di-substitued) thiol groups, carboxyl, ester, amide, substituted carbonyl groups in general, nitrile, nitro (optionally substituted) sulphonyl, alkenyl, aryl, quarternary ammonium (+) and sulphonium (+) with the proviso that in the bleach catalyst of formula (IV) the following ligand is excluded: wherein in case 1, both T&boxH;CH3, wherein in case 2, T&boxH;H or where m is 0 or an integer of 1, 2, 3 or 4; n is an integer of 1, 2 or 3; J1 and J2=H or F, wherein in case 3, T=â€”CH2COOH, â€”CH2P(O)OHW where W is OH or, C1-C5-alkyl or â€”Oâ€”(C1-C5)-alkyl, or where K1=â€”OH or â€”OCH3 K2 is â€”NO2, â€”NH3, isothiocyanato, semicarbazido, thiosemicarbazido, maleimido, bromoacetamido or carboxyl.