Nitro oxidizing agents, action

Lastly, the radical inter- and intramolecular cyclizations in the presence of one-electron oxidizing agents as a procedure for the synthesis of five-membered cyclic nitronates can be considered. Radical oxidation of a-nitro ketones (19) in the presence of disubstituted olefins under the action of Mn(OAc)3 was documented (72a) (Scheme 3.22, Eq. 1). 

Direct conversion of aldehydes to esters was carried out via oxidative benzoin reactions, using an aromatic nitro compound as an oxidizing agent under the catalytic action of cyanide ion or of a conjugate base of a thiazolium ion (Scheme 9). ... 

The difference between the action of oxidizing agents on the nitro derivative and the amino derivative is observed in the case of other compounds. Benzene derivatives which contain an amino group are readily decomposed by oxidizing agents, whereas rings which contain nitro groups are stable. The structure of napthalene is expressed by the formula,—... 

Another important type of the Sn processes is oxidative nucleophilic substitution of hydrogen (ONS). It suggests that aromatization of the intermediate o -adduct (Scheme 26) proceeds by action of an oxidative agent either an external one (e.g., KMnOa, CAN), or air oxygen, or one of components being present in the reaction mixture, for example, the starting nitro compoimd [5]. 

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