1601-97-4Relevant articles and documents
Benzidine Rearrangements. 18. Mechanism of the Acid-Catalyzed Disproportionation of 4,4'-Diiodohydrazobenzene. Application of Heavy-Atom Kinetic Isotope Effects
Shine, Henry J.,Habdas, Jan,Kwart, Harold,Brechbiel, Martin,Horgan, Ann Gafney,Filippo, Joseph San
, p. 2823 - 2827 (1983)
Nitrogen and carbon kinetic isotope effects (KIE) have been measured for the two-proton disproportionation of 4,4'-diiodohydrazobenzene (1).Disproportionation was carried out in 70percent aqueous dioxane under previously described kinetic conditions.The n
Microporous organic polymers based on tetraethynyl building blocks with N-functionalized pore surfaces: synthesis, porosity and carbon dioxide sorption
Zhang, Hongjiang,Zhang, Chong,Wang, Xunchang,Qiu, Zexiong,Liang, Xinmiao,Chen, Bing,Xu, Jiawei,Jiang, Jia-Xing,Li, Yuda,Li, Hui,Wang, Feng
, p. 113826 - 113833 (2016)
A series of microporous organic polymers (MOPs) based on tetraethynyl monomers such as tetrakis(4-ethynylphenyl)methane and tetrakis(4-ethynylphenyl)silane was synthesized via conventional Sonogashira-Hagihara coupling reaction. The resulting MOPs were ch
Supramolecular functionalization of Single-Walled Carbon Nanotubes (SWNTs) with a photoisomerizable conjugated polymer
Imin, Patigul,Imit, Mokhtar,Adronov, Alex
, p. 5045 - 5050 (2012)
A fluorene- and azobenzene-containing conjugated polymer, poly[2,7-(9,9-didodecylfluorene)-alt-4,4′-azobenzene] (F12AZO) has been successfully synthesized using Suzuki polycondensation. The introduction of two dodecyl chains on the flourene unit resulted
Photocatalytic oxidative coupling of arylamines for the synthesis of azoaromatics and the role of O2 in the mechanism
Sitter, James D.,Vannucci, Aaron K.
supporting information, p. 2938 - 2943 (2021/03/01)
The photocatalytic oxidative coupling of aryl amines to selectively synthesize azoaromatic compounds has been realized. Multiple different photocatalysts can be used to perform the general reaction; however, Ir(dF-CF3-ppy)2(dtbpy)+, where dF-CF3-ppy is 2-(2,4-difluorophenyl)-5-(trifluoromethyl)-pyridine and dtpby is 4,4′-tert-butyl-2,2′-bipyridine, showed the greatest range of reactivity with various amine substrates. Both electron-rich and -deficient amines can be coupled with yields up to 95% under an ambient air atmosphere. Oxygen was deemed to be essential for the reaction and is utilized in the regeneration of the photocatalyst. Fluorescence quenching and radical trap experiments indicate an amine radical coupling mechanism that proceeds through a hydrazoaromatic intermediate before further oxidation occurs to form the desired azoaromatic products.
Au@zirconium-phosphonate nanoparticles as an effective catalytic system for the chemoselective and switchable reduction of nitroarenes
Ferlin, Francesco,Cappelletti, Matteo,Vivani, Riccardo,Pica, Monica,Piermatti, Oriana,Vaccaro, Luigi
supporting information, p. 614 - 626 (2019/02/13)
In the present paper, a novel inorganic-organic layered material, a zirconium phosphate aminoethyl phosphonate, ZP(AEP), bearing aminoethyl groups on the layer surface, was used to immobilize AuNPs by a two-step procedure. The gold-based catalyst, Au1@ZP(AEP), containing 1 wt% Au, was characterized in terms of physico-chemical properties and TEM analysis revealed that the AuNPs have a spherical shape and an average size of 7.8 (±2.4) nm. Au1@ZP(AEP) proved its high efficiency for the chemoselective reduction of nitroarenes under mild conditions. Both batch and flow condition protocols have been defined. The catalytic system has been proven to be able to easily switch chemoselectivity allowing the control of the reduction of a series of nitroaromatics towards their corresponding azoxyarenes (2a-k) or anilines (2a-l) in 96% EtOH or abs EtOH, respectively, by using NaBH4 as a reducing agent, in good to excellent yields. Recovery and reuse of the catalytic system has been investigated proving the benefits of the flow approach.
