Facile synthesis of 1-naphthol azo dyes with nano SiO₂/HIO₄ under solvent-free conditions

Nano-silica supported periodic acid (nano-SPIA) has been utilized as a heterogeneous reagent for a highly efficient and one pot synthesis of azo dyes based on 1-naphthol under solvent-free conditions at room temperature. This method has some advantages, the reaction workup is very easy and the catalyst can be easily separated from the reaction mixture and one-pot procedure. The related products have been obtained in good to excellent yields, high purity and short reaction times. The structures of the products have been characterized by several techniques using UV-Vis, FT-IR, 1H NMR, 13C NMR and mass spectra.DOI: http://dx.doi.org/10.4314/bcse.v27i3.1

Nano Silica/ HIO 4 as a Green and Reusable Catalyst for Synthesis of 2-Naphthol Azo Dyes under Grinding Conditions

Abstract: Nanosilica periodic acid (nano-SPIA

Nano- SnCl4⋅SiO2: An efficient catalyst for one-pot synthesis of 2,4,5-tri substituted imidazoles under solvent-free conditions

AbstractNano- SnCl4⋅SiO2 as a solid Lewis acid has been synthesized by the reaction of nano- SiO2 and SnCl4. The structure characterization of this acid has been studied by FT-IR (ATR), XRD and SEM. Nano- SnCl4⋅SiO2 has been found to be an extremely efficient catalyst for the preparation of 2,4,5-trisubstituted imidazoles via three-component reactions of benzil, aldehydes and ammonium acetate under mild conditions. This process was simple and environmentally benign with high to excellent yields. Furthermore, the catalyst could be recovered conveniently and reused for at least three times