Synthesis of Acetamide Derivatives using S-MWCNT and S-MC as an Efficient Heterogeneous Catalysts

Abstract

Sulphate modified multiwalled carbon nanotubes (S-MWCNT) and Mesoporous carbon (S-MC) catalysts were prepared by wet impregnation method. These materials were characterized by different analytical techniques such as Powder-XRD, BET surface area analysis, SEM-EDS and TEM analysis to evaluate their bulk and surface properties. Surface acidity of the catalyst was measured by TPD-NH3 technique, as well as n-butyl amine titration. The estimated surface acidity of S-MWCNT and S-MC using n-butyl amine titration was found to be 0.82 and 1.75 mmol/g respectively. The catalytic activity of these materials was investigated in the synthesis of acetamide derivatives using aromatic acids with substituted aromatic amines in a liquid phase reaction. The reaction conditions were optimized to achieve good % yield of the products. In general S-MC catalyst exhibited good catalytic activity and gave higher % yield of the respective acetamides than S-MWCNT. This is attributed to higher surface acidity of S-MC, however the catalyst was found to be non-recyclable. S-MWCNT exhibited moderate % yield and 100% selectivity towards the formation of products. S-MWCNT catalyst was recycled up to 5 times with a consistent % yield of the respective acetamide derivatives. The synthesized acetamide derivatives were analyzed by M.P, 1HNMR techniques.

Enhanced recovery and recycling of catalyst by post‐impregnation of γ‐Al2O3 with 12‐tungstophosphoric acid for esterification reaction

“…A tetrahedral intermediate is produced by nucleophilic attack of 1‐hexanol to the carbocation. The reaction follows by the elimination of the water molecule, the formation of hexyl acetate, and the regeneration of the catalyst …”

Hydrothermal Modification of As‐Spun Polyurethane Micro‐Nanofibers Using Silk Fibroin and Biologically Reduced Silver Nanoparticles for Efficient Hydrophilicity and Antibacterial Properties

“…An additional shoulder peak at 64.43 °corresponding to the (220) crystal planes (hkl values) [60,61] was seen in the composite with the highest concentration of Ag NPs (15 wt.%) which is in agreement with published diffraction patterns. [62,63] The intensity of peaks was seen to sharpen with an increase in Ag content in the PU micro/nanofibers. The results indicated that Ag salt was reduced entirely to metal oxide NPs and incorporated into the SF-coated PU fibers.…”

Synthesis and crystal structure of N-phenyl-2-(phenylsulfanyl)acetamide

“…Sulfides have been presented inter alia as precursors for sulfonyl chloride synthesis (Langler et al, 1979). Advanced methods previously reported for the transformation of sulfides include, for example, using sulfate-modified multi-walled carbon nanotubes (S-MWCNT) and mesoporous carbon (S-MC) as heterogenous catalysts to facilitate the synthesis of acetamide derivatives (Minchitha et al, 2018).…”