| abstract |
In a process for the oxidation of a substrate, oxidation is effected by means of a telluroxide, said substrate being selected from compounds containing a group of formula C=S or C=Se, thiols, catechols, hydroquinones, arylhydrazines, isothiocyanates, hydrazones and arylhydroxylamines. The telluroxide is preferably a compound of formula:- <IMAGE> in which R and R<1>, which may be the same or different, each represents an optionally substituted aryl or heterocyclic group or R and R<1> together with the tellurium atom therebetween represent a heterocyclic ring, which may contain one or more further heteroatoms and which may carry substituents and/or fused aromatic rings. |