39769-33-0Relevant academic research and scientific papers
Aromatic amine oxidation process for preparing aromatic azobenzene method
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Paragraph 0013; 0017, (2017/10/11)
The invention relates to a method for preparing an aromatic azo compound by utilizing aromatic amine oxidation. In the method, air or oxygen serves as an oxygen source, and under the effect of a catalyst, aromatic amine is oxidized into the aromatic azo compound. The method is high in oxidization efficiency and product yield; the air or the oxygen serves as the oxygen source, and the method is economical and environmentally friendly. The product and the catalyst can be separated easily, and the aftertreatment is simple. The catalyst is easy to reuse, and the method has very good application prospect.
Oxidative coupling of anilines to azobenzenes using heterogeneous manganese oxide catalysts
Wang, Min,Ma, Jiping,Yu, Miao,Zhang, Zhe,Wang, Feng
, p. 1940 - 1945 (2016/04/05)
We herein report the transition metal oxide-catalyzed synthesis of azobenzenes through the oxidative coupling of anilines. An octahedral molecular sieve of manganese oxide, OMS-2, exhibited the best activity and selectivity. Nine examples of symmetric azobenzenes and twenty unsymmetric ones were synthesized with 62-99% conversion and 64-99% selectivity. In the aniline cross-coupling reactions, the difference of the Hammett constants of two substituted groups (Δσ) determines the selectivity to unsymmetric azobenzenes, which are the major products at Δσ 0.32. In-depth studies reveal that the surface defect sites of the mixed-valence manganese oxide play a key role in facilitating electron transfer and activating molecular oxygen. The single-electron transfer (SET) reaction mechanism is proposed based on electron paramagnetic resonance and X-ray powder diffraction characterization.
STUDIES ON THE MECHANISM OF THE OXIDATION OF AROMATIC PRIMARY AMINES WITH LEAD TETRAACETATE
Benedini, Francesca,Galliani, Guido,Nali, Micaela,Rindone, Bruno,Tollari, Stefano
, p. 343 - 346 (2007/10/02)
The oxidation of eight substituted anilines with lead tetraacetate gives azo derivatives and products deriving from nucleophilic nuclear attack.A ligand transfer mechanism and a reaction path via aminium radical is suggested for these oxidations.
