Catalytic oxidations of alcohols - Advances in Catalytic Activation of Dioxygen by Metal Complexes - page 128

A combination of and the stable nitroxyl radical, 2,2',6,6' -
tetramethylpiperidine-N-oxyl (TEMPO) is a remarkably effective catalyst
for the aerobic oxidation of a variety of primary and secondary alcohols,
giving the corresponding aldehydes and ketones, respectively, in >99%
selectivity 29 . The best results were obtained using 1m% of

and

3m% of TEMPO (Reaction 4).

The results obtained in the oxidation of representative primary and
secondary aliphatic alcohols and allylic and benzylic alcohols using this
system are shown in Tables 1 and 2.