The role of nitrate free radicals in the photochemical side-chain nitrooxylation of alkylbenzenes by cerium(IV) ammonium nitrate in acetonitrile
作者:E. Baciocchi、I. Del Giacco、C. Rol、G.V. Sebastiani
DOI:10.1016/s0040-4039(00)61933-0
日期:1985.1
It is suggested that the reactive species in the CAN-induced photochemical side-chain nitrooxylation of alkylbenzenes is the nitrate radical, which probably acts as one-electron oxidant.
Cerium (IV) ammonium nitrate catalyzed photochemical autoxidation of alkylbenzenes
作者:E. Baciocchi、T. Del Giacco、C. Rol、G.V. Sebastiani
DOI:10.1016/s0040-4039(00)98296-0
日期:1985.1
The autoxidation of alkylbenzenes can be promoted photochemically in the presence of catalytic amounts of cerim (IV) ammonium nitrate (CAN) under very mild conditions, the efficiency of the process being significantly increased by added acids. It is suggested that the reaction is promoted by NO3, radicals formed in the light induced decomposition of CAN and that Ce(III) may be reoxidized to Ce(IV)
obtained from the ortho isomer), with minimal ring nitration. The formation of bibenzyls on irradiation with t-butyl peroxide of the same substrates is also studied. The mechanisms of the reactions with the NO•3 radical, a good electron acceptor, and with the alkoxy radical are contrasted and compared with photochemical hydrogen abstraction by nπ* and, respectively, ππ* excited states.