In situ generated hypoiodous acid in an efficient and heterogeneous catalytic system for the homo-oxidative coupling of thiols

Supported hydrogen peroxide on polyvinylpolypyrrolidone (PVPH2O2), silica sulfuric acid (SiO2-OSO3H) and catalytic amounts of potassium iodide (KI) has been developed as a heterogeneous medium for the rapid oxidative coupling of thiols into symmetrical homodisulfides. This oxidizing system proceeds under extremely mild conditions and gives no other oxidized side products

Metal-free catalytic oxidation of sulfides to sulfoxides with ammonium nitrate, ammonium hydrogen sulfate and ammonium bromide as catalyst

A general and metal-free catalytic oxidation of aliphatic and aromatic sulfides to their corresponding sulfoxides via combination of ammonium nitrate (NH4NO3), supported ammonium hydrogen sulfate on silica gel (NH4HSO4-SiO2) and a catalytic amount of ammonium bromide (NH4Br) in the presence of wet SiO2 (50%, w/w) has been investigated. The reactions were carried out heterogeneously and selectively in short reaction times in CH2Cl2 at room temperature. This protocol is mild and efficient compared to other reported methods

Fe3O4@SiO2@KIT-6@2-ATP@CuI as a catalyst for hydration of benzonitriles and reduction of nitroarenes

Abstract In this paper, a new type of magnetic mesoporous material (Fe3O4@SiO2@KIT-6@2-ATP@CuI) was designed and synthesized and its application in the synthesis of amides and anilines was investigated. The structure of Fe3O4@SiO2@KIT-6@2-ATP@CuI was characterized and identified using FTIR, SEM, XRD, TGA, BET, VSM, and ICP techniques. An external magnet can easily remove the synthesized catalyst from the reaction medium, and be reused in several consequence runs

Cu(I)-PNF, an organic-based nanocatalyst, catalyzed C–O and C–S cross-coupling reactions

Peptide nanofiber has been prepared via a self-assembly protocol and decorated with Cu (I) to prepare a nanostructural catalyst. The catalytic activity of this prepared nano material (Cu (I)-PNF) was examined in Câ O and Câ S cross-coupling reactions. Compared with conventional copper-ligand catalytic systems, CuNP-PNF has unique advantages such as water solubility, high efficiency and low cost, which makes it a highly efficient and beneficial catalyst to reuse in cross coupling reactions.The accepted manuscript in pdf format is listed with the files at the bottom of this page. The presentation of the authors' names and (or) special characters in the title of the manuscript may differ slightly between what is listed on this page and what is listed in the pdf file of the accepted manuscript; that in the pdf file of the accepted manuscript is what was submitted by the author

Synthesis and Characterization of Sulfamic Acid-Functionalized Nanoparticles and Study of Its Catalytic Activity for the Oxidation of Sulfides to Sulfoxides

The synthesis, characterization and applications of sulfamic acid-functionalized magnetic nanoparticles as a magnetically separable nanocatalyst are described. The nanostructure of the catalyst was characterized by FT-IR spectroscopy, thermogravimetric (TGA) analysis, powder X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscope (TEM). <br><a rel="license" href="http://creativecommons.org/licenses/by/4.0/"><img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by/4.0/80x15.png" /></a> This work is licensed under a <a rel="license" href="http://creativecommons.org/licenses/by/4.0/">Creative Commons Attribution 4.0 International License</a>

4,6-Diamino-2-thiopyrimidine-based Cobalt Metal Organic Framework (Co-DAT‐MOF): green, efficient, novel and reusable nanocatalyst for synthesis of multicomponent reactions

Abstract In this study, Co-DAT‐MOF powder was prepared via the solvothermal method using 4, 6-diamino-2-thiopyrimidine as the organic linker and Co(NO3)2·6H2O. The synthesized catalysts are characterized using XRD, FT-IR, TGA, SEM, BET, NH3-TPD, and ICP-OES techniques. SEM analysis clearly indicated the formation of nanosheet microspheres. NH3-TPD-MS was employed as a means of identifying the various strengths of acid sites and their relative abundance in an attempt to explain the effect of the catalyst surface acid sites. We identified a new acidic feature in Co-DAT‐MOF catalyst, related to the presence of desorption peaks in the NH3-TPD profiles. The activity of Co-DAT‐MOF catalyst for the synthesis of multicomponent reactions correlates with lewis acidity. In addition, Co-DAT‐MOF exhibited excellent performance for the synthesis of pyrroloacridine-1(2H)-one and chromeno [2, 3- d] pyrimidin-8-amines, as well as good reusability and recyclability