Process of oxidizing a polysaccharide or carbohydrate substrate with an oxidant in the presence of a nitroxide radical and an amide or imide co-catalysts

摘要

A process for oxidizing of substrates containing alcohol groups comprises oxidizing the alcohol groups in a suitable medium with an oxidant in the presence of a nitroxide radical mediator formula (I) or (II) and at least one co-catalyst having functionality being either a amide or a imide. In formula (I) A is a chain of 2-3 carbon, nitrogen or oxygen atoms and R1-R6 are independently alkyl. The process can be used to prepare an aldehyde-modified cellulose, cellulose pulp or cellulose fibre which can be used in paper making.