2050-14-8Relevant articles and documents
Photochemical catalytic synthesis method of aromatic azo compound
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Paragraph 0059-0060, (2020/05/02)
The invention belongs to the field of photochemical organic synthesis, and particularly relates to a photochemical catalytic synthesis method of an aromatic azo compound, which comprises the followingstep: in the presence of light, a photocatalyst, a cocatalyst, a ligand, an alkali and a hydrogen donor, carrying out a deoxidation coupling reaction on a nitro-substituted aromatic compound to obtain the aromatic azo compound. According to the reaction system, the nitro-substituted aromatic compound can be selectively deoxidized and coupled to obtain the aromatic azo compound, and the highest yield of the product can reach 85% or above.
A Highly Efficient Near-Infrared-Emissive Copolymer with a N=N Double-Bond π-Conjugated System Based on a Fused Azobenzene–Boron Complex
Gon, Masayuki,Tanaka, Kazuo,Chujo, Yoshiki
supporting information, p. 6546 - 6551 (2018/04/30)
Fused azobenzene–boron complexes (BAzs) show highly efficient near-infrared (NIR) emission from the nitrogen–nitrogen double bond (N=N) containing π-conjugated copolymer. Optical measurements showed that BAz worked as a strong electron acceptor because of the intrinsic electron deficiency of the N=N double bond and the boron–nitrogen (B?N) coordination which dramatically lowered the energy of the lowest unoccupied molecular orbital (LUMO) of the azobenzene ligand. The simple donor–acceptor (D–A) type copolymer of bithiophene (BT) and BAz exhibited intense photoluminescence (PL) in the NIR region both in the dilute solution (λPL=751 nm, ΦPL=0.25) and in the film (λPL=821 nm, ΦPL=0.038). The BAz monomer showed slight PL in the dilute solution, and aggregation-induced emission (AIE) was detected. We proposed that N=N double bonds should be attractive and functional building blocks for designing π-conjugated materials.
Synthesis of azo compounds by nanosized iron-promoted reductive coupling of aromatic nitro compounds
Moglie, Yanina,Vitale, Cristian,Radivoy, Gabriel
, p. 1828 - 1831 (2008/09/18)
Treatment of a variety of aromatic nitro compounds with the active-iron based reducing system composed of FeCl2·4H2O, an excess of lithium powder and a catalytic amount of 4,4′-di-tert-butylbiphenyl (DTBB, 5 mol %) in THF at room temperature, led to the formation of the corresponding symmetrically substituted azo compounds in good yield, resulting from a reductive coupling process. Some other functionalities including carbonyl, halogen, amino and hydroxyl groups, demonstrated to be compatible with the reaction conditions, giving none reduced or coupled by-products. In all cases, the azo compounds formed have not experienced over-reduction to the corresponding hydrazo or amino derivatives even upon prolonged heating or using an excess of the reducing system.
