26151-92-8Relevant academic research and scientific papers
Selective oxidation of thiols and alcohols by physically encapsulated nickel schiff-base complex prepared via sol-gel method as nano-catalyst
Eshtiagh-Hosseini, Hossein,Tabari, Taymaz,Takjoo, Reza,Eshghi, Hossein
, p. 264 - 272 (2013/04/10)
A heterogeneous catalyst was prepared by direct physical encapsulation of nickel Schiff-base complex into the silicon dioxide matrix via sol-gel method. The compounds were characterized by FT-IR, SEM, TEM, XRD, CHNS, and AAS. The catalytic performance in the alcohols and thiols oxidation was investigated in the presence of H2O2 (10 mmol, 30%) as oxidant. After five recycle runs, the catalyst showed 13% reduction in activity with slightly Ni(II)-complex leached to the solvent. Varieties of primary and secondary alcohols were efficiently oxidized to the corresponding ketones. Thiols were oxidized in coupling reaction to disulfides in excellent yields using nano-catalyst with H2O2.
Effect of phosphorus amount on the particle size and catalytic performance of heterogeneous nickel(ii) schiff-base complex in aldol condensation reaction
Eshtiagh-Hosseini, Hossein,Tabari, Taymaz
, p. 1778 - 1791 (2013/11/06)
The organic-inorganic hybrid of citric acid, tetraethoxysilane (TEOS), and triethylphosphate (TEP) doped by a nickel Schiff-base complex was prepared by sol-gel method. The prepared composites were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmittance electron microscopy (TEM), scanning tunnelling microscopy (STM), and infrared spectroscopy (IR). In order to determine the phosphorus amount effect on the catalytic activity of the prepared composites, the aldol condensation was used as a model reaction. The results revealed that the composite with 10% phosphorus is a better catalyst in comparison with other composites.
