Photosubstitution-photoreduction mechanistic duality in the SET photoreactions of nitrophenyl ethers with amines. The role of the steps that follow the ET
作者:Miquel Mir、Jordi Marquet、Oriol Massot
DOI:10.1016/s0040-4020(99)00735-8
日期:1999.10
photoreduced by primary amines in water through a mechanism initiated by single electron transfer that is in direct competition with the single electron transfer photosubstitution mechanism (SNAr∗-SET). Our results indicate that the preferred pathway does not depend on the electron donor or proton donor ability of the amine. The key factor that determines the progress of the photoreaction is the structure
Azoxybenzenes (1) were heated at 245–250 °C to give azobenzenes (2), 2-hydroxyazobenzenes (3), 2-hydroxy-azoxybenzenes (4), 4-hydroxyazobenzenes (5), and 4-hydroxyazoxybenzenes (6). Compounds 4 and 6 were mostly composed of α-isomers. In the reaction of azoxytoluenes, their methyl groups were oxidized to formyl groups. It was proposed that 4 and 6 were the intermediates of the thermal rearrangement
Organocatalytic oxidation of substituted anilines to azoxybenzenes and nitro compounds: mechanistic studies excluding the involvement of a dioxirane intermediate
作者:Errika Voutyritsa、Alexis Theodorou、Maroula G. Kokotou、Christoforos G. Kokotos
DOI:10.1039/c6gc03174a
日期:——
An organocatalytic and environmentally friendly approach for the selective oxidation of substituted anilines was developed. Utilizing a 2,2,2-trifluoroacetophenone-mediated oxidation process, substituted anilines can be transformed to azoxybenzenes, while simple treatment...
Organic photochemistry. Part VIII. The photochemical reduction of nitro-compounds
作者:J. A. Barltrop、N. J. Bunce
DOI:10.1039/j39680001467
日期:——
Aromatic nitro-compounds, when irradiated with u.v. light in organic solvents containing abstractable hydrogen atoms, give rise to reduction products, the relative proportion of which depends on the solvent and the wavelength of the exciting radiation. The overall reaction is shown to involve a sequence of photochemical and thermal steps, the first of which is a hydrogen abstraction probably by a 3(ππ*)
for the direct oxidation of anilines to the corresponding azo and azoxy homocoupling products by using a planetary ballmill was developed. Various oxidants and grinding auxiliaries were tested and a variety of substituted anilines were investigated. It was possible to form chemoselectively either azo, azoxy, or the nitro compounds from reaction of aromatic anilines. The selectivity of the solvent‐free