| 摘要 |
This invention concerns a multicomponent system for changing, reducing or bleaching lignin, lignin-containing materials or similar substances containing a) optionally, at least one oxidation catalyst and b) at least one suitable oxidant and c) at least one mediator characterized by the fact that the mediator is selected from the cyclical N-hydroxy compounds with at least one optionally substituted five- or six-member ring containing the structure named in formula (A), as well as its salts, ethers or esters, where X and Y are the same or different and mean O, S, or NR<1>, where R<1> means a hydrogen, hydroxy, formyl, carbamoyl, sulfono radical, an ester or salt of the sulfono radical, a sulfamoyl, nitro, amino, phenyl, aryl C1-C5-alkyl, C1-C12-alkyl, C1-C5-alkoxy, C1-C10-carbonyl, carbonyl-C1-C6-alkyl, phospho, phosphono, phosphonooxy radical, ester or salt of the phosphonooxy radical, where the carbamoyl, sulfamoyl, amino and phenyl radicals can be unsubstituted or singly or multiply substituted with radical R<2>, and the aryl-C1-C5-alkyl, C1-C12-alkyl, C1-C5-alkoxy, C1-C10-carbonyl, carbonyl-C1-C6-alkyl radicals can be saturated or unsaturated, branched or unbranched, where R<2> is the same or different and represents a hydroxy, formyl, carboxy radical, an ester or salt of the carboxy radical, a carbamoyl, sulfono ester or salt of the sulfono radical, a sulfamoyl, nitro, amino-, phenyl, C1-C5-alkyl, C1-C5-alkoxy radical. |
