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.
Reactions of cerium(<scp>IV</scp>) ammonium nitrate with aromatic compounds in acetonitrile. Part 1. The mechanism of side-chain substitution
作者:Suphi Dinçtürk、John H. Ridd
DOI:10.1039/p29820000961
日期:——
with cerium(IV) ammoniumnitrate in acetonitrile to give nitrocompounds and (if α-hydrogen atoms are present) also the products of side-chain substitution. With many substrates, the major products of side-chain substitution are benzyl nitrates but compounds which can give rise to particularly stable benzyl cations give mainly productsfromreaction with the solvent. Relative rates of side-chain substitution
苯,烷基苯和酚醚在乙腈中与硝酸铈(IV)铵反应,生成硝基化合物,以及(如果存在α-氢原子)侧链取代的产物。对于许多底物,侧链取代的主要产物是硝酸苄基酯,但是会产生特别稳定的苄基阳离子的化合物主要产生与溶剂反应的产物。侧链取代的相对速率已通过竞争法确定:结果表明,通过自由基阳离子进行的反应以及在与[ 2 H 10 ] -p反应中观察到的同位素效应k H / k D = 2.3-二甲苯表明该自由基阳离子的质子损失至少部分是速率决定的。
The Two-phase Oxidation of Some Aromatic Compounds with Cerium Ammonium Nitrate in the Presence of Surfactants
作者:Jacek Skr\.{z}ewski、Ewa Cichacz
DOI:10.1246/bcsj.57.271
日期:1984.1
ammonium nitrate were carried out in the presence of cationic, nonionic, and anionic surfactants. Both cationic (ammonium salt) and nonionic (Dipodand) surfactants inhibited the reaction. The anionic surfactant (sodium dodecyl sulfate, SDS) catalyzed these oxidations. From the product distribution it was concluded that the catalytic action of SDS is due to the binding of aromaticcompounds and the Ce(IV)