330-42-7Relevant academic research and scientific papers
Modulating the catalytic behavior of non-noble metal nanoparticles by inter-particle interaction for chemoselective hydrogenation of nitroarenes into corresponding azoxy or azo compounds
Liu, Lichen,Concepción, Patricia,Corma, Avelino
, p. 312 - 323 (2018/12/11)
Aromatic azoxy compounds have wide applications and they can be prepared by stoichiometric or catalytic reactions with H2O2 or N2H4 starting from anilines or nitroarenes. In this work, we will present the direct chemoselective hydrogenation of nitroarenes with H2 to give aromatic azoxy compounds under base-free mild conditions, with a bifunctional catalytic system formed by Ni nanoparticles covered by a few layers of carbon (Ni@C NPs) and CeO2 nanoparticles. The catalytic performance of Ni@C-CeO2 catalyst surpasses the state-of-art Au/CeO2 catalyst for the direct production of azoxybenzene from nitrobenzene. By means of kinetic and spectroscopic results, a bifunctional mechanism is proposed in which, the hydrogenation of nitrobenzene can be stopped at the formation of azoxybenzene with >95% conversion and >93% selectivity, or can be further driven to the formation of azobenzene with >85% selectivity. By making a bifunctional catalyst with a non-noble metal, one can achieve chemoselective hydrogenation of nitroarenes not only to anilines, but also to corresponding azoxy and azo compounds.
Method for synthesizing oxidized azo compound through selective oxidation of aromatic amine
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Paragraph 0027-0051; 0052-0055, (2019/02/13)
The invention discloses a method for synthesizing an oxidized azo compound through selective oxidation of an aromatic amine, wherein an aromatic amine is used as a raw material, hydrogen peroxide is used as an oxidizing agent, a titanium-silicon molecular sieve or a metal modified titanium-silicon molecular sieve is used as a catalyst, and the aromatic amine is subjected to selective catalytic oxidation to prepare the corresponding oxidized azobenzene compound. According to the present invention, the method has advantages of environmental protection, good selectivity, high product yield, easyseparation and recycling of the catalyst, simple instrument required by the reaction, and easy operation.
A Green Chemoenzymatic Process for the Synthesis of Azoxybenzenes
Yang, Fengjuan,Wang, Zhi,Zhang, Xiaowen,Jiang, Liyan,Li, Yazhuo,Wang, Lei
, p. 3450 - 3453 (2015/11/10)
An efficient chemoenzymatic process for the synthesis of azoxybenzenes was developed. A peracid was generated in situ by Novozym 435, and then a range of anilines were oxidized by the produced peracid to afford azoxybenzenes in yields ranging from 63.1 to 94.1 %. This method expands the application of lipase in organic synthesis and provides an alternative method for the synthesis of azoxybenzenes.
Selective N-oxidation of aromatic amines to nitroso derivatives using a molybdenum acetylide oxo-peroxo complex as catalyst
Biradar, Ankush V.,Kotbagi, Trupti V.,Dongare, Mohan K.,Umbarkar, Shubhangi B.
, p. 3616 - 3619 (2008/09/19)
The molybdenum acetylide oxo-peroxo complex obtained in situ by the treatment of the corresponding molybdenum acetylide carbonyl complex, CpMo(CO)3(C{triple bond, long}CPh); Cp = η5-C5H5 with H2O2, has been used as an efficient catalyst for selective N-oxidation of primary amines to nitroso derivatives. Excellent amine conversion (up to 100%) and very high selectivity for nitroso compounds (99%) have been obtained using 30% hydrogen peroxide as an oxidant. The oxo peroxo Mo(VI) complex has also been found to be very active for the oxidation of various substituted primary aromatic amines with electron donating as well as electron withdrawing substituents on the aromatic ring.
A new non-metal heterogeneous catalyst for the activation of hydrogen peroxide: A perfluorinated ketone attached to silica for oxidation of aromatic amines and alkenes
Neimann,Neumann
, p. 487 - 488 (2007/10/03)
A silane functionalized by octafluoroacetophenone was polymerized by the sol-gel method to form an insoluble silicate with perfluoroketone pendants; the silicate was used as a heterogeneous catalyst for the activation of aqueous hydrogen peroxide and the oxidation of aromatic amines and alkenes.
Thermal- and photo-induced transformations of N-aryl-N-nitroso-hydroxylamine ammonium salts to azoxy compounds
Hwu, Jih Ru,Yau, Chii Shyang,Tsay, Shwu-Chen,Ho, Tong-Ing
, p. 9001 - 9004 (2007/10/03)
Heating of an ethanolic solution containing N-aryl-N-nitrosohydroxylamine ammonium salts at 78°C produced the desired azoxy compounds in 80-93% yields. Furthermore, irradiation with UV light (κ ≤300 nm) of ethanolic solutions of those ammonium salts at room temperature also provided the desired azoxy compounds in 51-72% yields.
EFFECT OF FLUORINE SUBSTITUTION ON STRETCHING VIBRATIONS OF THE AZOXY GROUP IN AZOXYBENZENES
Korobeinicheva, I. K.,Fugaeva, O. M.,Furin, G. G.
, p. 373 - 384 (2007/10/02)
The IR and Raman spectra of azoxybenzene (I) and a number of its fluoroderivatives have been analysed, including the (15)N and (18)O labelled samples and complexes of some aszoxybenzenes with SbCl5.On the basis of the calculated frequencies and forms of n
