Electrochemical oxidation hydroxamic acids

Electrochemical oxidation of hydroxamic acids in the presence of amines, alcohols or water afforded the corresponding amides, esters or carboxylic acids (equation 19) . ... [Pg.506]

More recently, the soundness of the electrochemical approach for the generation of PINO from HPI has been confirmed by using cyclic voltammetry at a rotating disk electrode. Anodic oxidation had been also employed for the generation of the aminoxyl radical from hydroxamic acids. ... [Pg.716]

The conversion of carboxylic acids and their derivatives into isoQranates is a synthetically useful and well-known transformation and two new methods now add to the available methodology. In one, amides are transformed electrochemically imder mild conditions to isocyanates, which are isolated or trapped as the corresponding carbonates. In the other method, adducts of nitrosocarbonylbenzenes (generated by oxidation of hydroxamic acids) and 9,10-dimethylanthracene are decomposed in benzene at 80 °C in the presence of triphenylphosphine, to give aryl isocyanates in high yield. ... [Pg.230]

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