34063-53-1Relevant articles and documents
Synthesis, spectral characterization, SC-XRD, HSA, DFT and catalytic activity of novel dioxovanadium(V) complex with aminobenzohydrazone Schiff base ligand: An experimental and theoretical approach
Ashfaq, Muhammad,Behjatmanesh-Ardakani, Reza,Fallah-Mehrjardi, Mehdi,Kargar, Hadi,Munawar, Khurram Shahzad,Tahir, Muhammad Nawaz
, (2021/07/28)
A new dioxovanadium(V) complex was prepared by the reaction of VO(acac)2 with a tridentate ONO donor Schiff base, derived by condensing 3-ethoxysalicylaldehyde and 4-aminobenzohydrazide. The structures of synthesized products were characterized spectroscopically through FT-IR, 1H & 13C NMR and by elemental composition through combustion analysis. The structure of the complex was determined with the help of single crystal X-ray crystallography. It was inferred from the diffraction data that the geometry around the central metal ion in the complex is distorted square pyramidal. The tridentate Schiff base ligand is bonded to the central metal through the oxygen of the carbonyl group, the deprotonated phenolic oxygen atom and the azomethine nitrogen. The pyramid base is completed by other oxo ligands that are in cis positions. The theoretical calculations, performed by DFT using B3LYP/Def2-TZVP level of theory, determined that the intended outcomes are in compliance with the actual consequences. Furthermore, the catalytic potential of the vanadium complex was explored for the selective oxidation of the aryl and alkyl sulfides to the corresponding sulfones in the presence of 30% aqueous H2O2 in ethanol. In this work, rPBE and B3LYP methods are used to locate transition structures and to compare free energies of reactants, transition structures and the products involved in the reaction. Analyzing nudge elastic band data shows that the barrier free energy for the oxidation of sulfide to sulfoxide and sulfone are 13 and 83 kcal.mol?1, respectively. The main advantages of the present catalytic study are high yields of the products, less time required for the completion of the reaction and simple work-out procedure.
Base-controlled divergent synthesis of vinyl sulfones from (benzylsulfonyl)benzenes and paraformaldehyde
Xiao, Fuhong,Hu, Yangling,Huang, Huawen,Xu, Fen,Deng, Guo-Jun
supporting information, p. 3527 - 3535 (2020/05/25)
A tuneable metal-free protocol for the selective preparation of a-substituted vinyl sulfone and (E)-vinyl sulfone derivatives has been described. In this process, stable paraformaldehyde was used as the carbon source. The base played an important role in the selectivity control of transformations. More than 50 products were synthesized with excellent chemoselectivity and broad functional group tolerance.
Fe3O4?BNPs?SiO2-SO3H as a highly chemoselective heterogeneous magnetic nanocatalyst for the oxidation of sulfides to sulfoxides or sulfones
Ghanbari Kermanshahi, Mohammad,Bahrami, Kiumars
, p. 36103 - 36112 (2019/11/20)
To achieve green chemistry goals and also to reduce the cost of catalysts as well as to avoid producing toxic wastes and show the importance of separation and recycling of catalysts from the reaction medium, in this work, we describe the preparation and characterization of magnetic acidic boehmite nanoparticles as a heterogeneous catalyst, which is called Fe3O4?BNPs?SiO2-SO3H. This catalyst works efficiently in the selective oxidation of sulfides to sulfoxides or sulfones in the presence of H2O2 as a green oxidant. It can easily be separated from the reaction medium by using an external magnet and it was recycled 6 times without loss of magnetic catalytic properties.
