Manganate, electron transfer with

Mechanism The Mn02 oxidation reaction is believed to proceed by adsorption of alcohol on Mn02 followed by coordination of both alcohol and Mn02- Electron transfer then produces the radical, and Mn(IV) is reduced to Mn(III). Another electron transfer is followed by the release of adsorbed carbonyl product with the loss of water from Mn(OH)2 (Scheme 7.4). An ionic mechanism is also proposed for this oxidation which involves the formation of manganate ester. ... 

Tris(dihydrogen diphosphato)manganate(m) has also been widely used as an oxidant, and in the reaction with mandelic acid in sulphuric acid media the initial step is the formation of a mixed Mn complex which undergoes hydrogen-ion-catalysed internal electron transfer to yield a radical. Further oxidation leads to benzaldehyde as the organic product (Scheme 3). The presence of Mn retards the rate, possibly as a result of competition for the radicals produced. 

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