The photochemically induced oxidation of aniline by hydroperoxides: An electron paramagnetic resonance study. Part II.
作者:Loris Grossi
DOI:10.1016/s0040-4020(01)85525-3
日期:——
The oxidation reaction of aniline by tertiary hydroperoxides, induced photochemically, was studied. The peculiar radical intermediates, nitroxides and peroxy radicals, involved in the reaction mechanism were detected and identified by EPR spectroscopy. The presence of these intermediates confirm that PhNO is the first product of the oxidation of aniline and the PhNH· radical as its precursor.
N-Alkylanilines X-NH-Ph (Ph = substituted phenyl ring) with two different types of alkyl substituent X [X = C2H5-CO-CH2CH(Ph), X = CH3, C2H5, CH(CH3)(2), CH2C6H5] were oxidized using different agents. While oxidation with 3-chloroperbenzoic acid leads to production of the corresponding aminoxyl radicals X-NOaEuro cent-Ph, it was confirmed that application of PbO2 resulted in the formation of aminyl radicals X-N-aEuro cent-Ph, as indirectly proved by the spin-trapping method. Contrary to those transformations, with employment of either Pb(OAc)(4) or t-BuO (2) (aEuro cent) radical, reactions taking place on the alkyl substituent were also observed.