Functionalization of Mesoporous Carbon with Superbasic MgO Nanoparticles for the Efficient Synthesis of Sulfinamides

Abstract

Highly basic MgO nanoparticles with different sizes have been successfully immobilized over mesoporous carbon with different pore diameters by a simple wet-impregnation method. The prepared catalysts have been characterized by various sophisticated techniques, such as XRD, nitrogen adsorption, electron energy loss spectroscopy, high-resolution TEM, X-ray photoelectron spectroscopy, and the temperature-programmed desorption of CO(2). XRD results reveal that the mesostructure of the support is retained even after the huge loading of MgO nanoparticles inside the mesochannels of the support. It is also demonstrated that the particle size and dispersion of the MgO nanoparticles on the support can be finely controlled by the simple adjustment of the textural parameters of the supports. Among the support materials studied, mesoporous carbon with the largest pore diameter and large pore volume offered highly crystalline small-size cubic-phase MgO nanoparticles with a high dispersion. The basicity of the MgO-supported mesoporous carbons can also be controlled by simply changing the loading of the MgO and the pore diameter of the support. These materials have been employed as heterogeneous catalysts for the first time in the selective synthesis of sulfinamides. Among the catalysts investigated, the support with the large pore diameter and high loading of MgO showed the highest activity with an excellent yield of sulfinamides. The catalyst also showed much higher activity than the pristine MgO nanoparticles. The effects of the reaction parameters, including the solvents and reaction temperature, and textural parameters of the supports in the activity of the catalyst have also been demonstrated. Most importantly, the catalyst was found to be highly stable, showing excellent activity even after the third cycle of reaction.

A Palladium-Catalyzed Three-Component Synthesis of Arylmethylsulfonamides

“…. MS (ESI): m/z calcd for C 22 H 31 NO 2 S: 373.21; found: 372.27 [M -H] -.Analytical data are consistent with those reported in the literature 15. …”

Design and fabrication of mesoporous heterogeneous basic catalysts

“…319 This leads to the fabrication of a new type of mesoporous solid base, namely MgO-modified mesoporous carbon, which exhibits motivating basic and catalytic properties. Basic oxide modification.…”

“…319 Magnesia with different contents was encapsulated inside the mesochannels of CMK-3. The process is generally similar to the synthesis of MgO-modified mesoporous oxides.…”

Self‐Assembling and Size‐Selective Synthesis of Ni and NiO Nanoparticles Embedded in Ordered Mesoporous Carbon and Polymer Frameworks

“…They are fabricated by incorporating metals (oxides) within pores by impregnation or by modifying metal (oxide) nanoparticles within carbon mesopore walls. [1][2][3][4][5][6][7][8][9][10] The latter case is superior to the incorporation of particles in pores in that open pores are retained and pore blockages are avoided, especially at high loadings. [5a] On the other hand, the nanoparticle size has a great effect on catalytic performance.…”