2688-84-8Relevant articles and documents
Highly robust magnetically recoverable Ag/Fe2O3 nanocatalyst for chemoselective hydrogenation of nitroarenes in water
Patra, Astam K.,Vo, Nhat Tri,Kim, Dukjoon
, p. 148 - 156 (2017)
This work reports on additive-free Ag nanoparticles (4–6?nm) deposition on magnetic α-Fe2O3 nanocrystals surface by the slow reduction of AgNO3 with NaBH4 in aqueous medium. The EDS analysis revealed that the new materials contain 3.93?wt% of Ag nanoparticle on the surface of α-Fe2O3 which are the active suite for hydrogenation reaction. The Ag/Fe2O3 nanocatalysts exhibited good catalytic ability toward chemoselective hydrogenation of nitroarenes in water. LC–MS study suggested that the catalytic reaction pathway is –NO2, –NHOH, –NH2 and certainly skips the nitrosoarene intermediate step. The nanocatalysts are very efficient in the hydrogenation of nitroarenes tolerating –H, –Br, –I, –OH, –OCH3, –COOH and –CONH2 functional groups. The nanocatalysts were separated by external magnet and recycled in aqueous medium which offer environmentally and safe approach to this hydrogenation reaction. The catalyst was tested up to 10 recycles and showed no significant loss of catalytic activity.
Copper complexes of 1,4-diazabutadiene ligands: Tuning of metal oxidation state and, application in catalytic C-C and C-N bond formation
Mukherjee, Aparajita,Basu, Semanti,Bhattacharya, Samaresh
, (2019/11/11)
Reaction of 1,4-diazabutadiene (p-RC6H4N = C(H)(H)C = NC6H4R-p; R = OCH3, CH3, H and Cl; abbreviated as L-R) with CuCl2·2H2O in methanol at ambient temperature (25 °C) affords a group of doubly chloro-bridged dicopper complexes of type [{CuI(L-R)Cl}2], designated as 1-R. Similar reaction carried out in acetonitrile furnishes a family of doubly chloro-bridged dicopper complexes of type [{CuII(L-R)Cl2}2], designated as 2-R. Molecular structures of 1-OCH3 and 2-OCH3 have been determined by X-ray crystallography. While copper(I) is having a nearly tetrahedral N2Cl2 coordination sphere in 1-OCH3, the N2Cl3 coordination sphere around copper(II) is distorted square pyramidal in nature in 2-OCH3. Isolated 2-R complexes, on dissolution in methanol, are found to undergo facile reduction of the metal center to generate the corresponding 1-R complexes. The 1-R and 2-R complexes show intense absorptions in the visible and ultraviolet regions. Cyclic voltammetry on the 1-R and 2-R complexes shows both metal-centered and ligand centered redox responses. The 1-R complexes are found to efficiently catalyze C-N cross-coupling reactions between arylboronic acids and aryl amines; while the 2-R complexes display notable catalytic efficiency for nitroaldol reactions.
COMPOUND AND ORGANIC ELECTRONIC DEVICE USING THE SAME
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Paragraph 0078; 0079; 0082, (2019/04/14)
Provided are a novel compound and an organic electronic device using the same. The novel compound is represented by the following Formula (I): wherein Y is an oxygen atom or a sulfur atom; X1 and X2 are each independently C(Ra), the two (Ra)s are the same or different, and the two (Ra)s are joined together to form a first aryl ring; X3 and X4 are each independently C(Rb), the two (Rb)s are the same or different, and the two (Rb)s are joined to form a second aryl ring or a heteroaryl ring.
