8 research outputs found
Nano-Ticl4.SiO2: a Versatile and Efficient Catalyst for Synthesis of Dihydropyrimidones via Biginelli Condensation
Get PDFNano-TiCl4.SiO2 has been found to be an extremely efficient catalyst for the preparation of 3,4-dihydropyrimidinones/thiones via three-component reactions of an aldehyde, β-ketoester or β-diketone and urea or thiourea under mild conditions. Nano-TiCl4.SiO2 as a solid Lewis acid has been synthesized by reaction of nano-SiO2 and TiCl4. The structural characterization of this acid has been studied by FT-IR (ATR), XRD, SEM and TEM. 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.KEYWORDS: Nano-TiCl4.SiO2, heterogeneous catalyst, multi-component reaction, β-ketoester, β-diketone, urea
One-pot solvent-free synthesis of 2,3-dihydro-2-substituted-1H-naphtho[1,2-e][1,3]oxazine derivatives using Fe3O4@nano-cellulose/TiCl as a bio-based and recyclable magnetic nano-catalyst
No full textNano-WO3-Supported Sulfonic Acid: A Versatile Catalyst for the One-Pot Synthesis of 14-Aryl-14H-dibenzo[a,j]xanthene Derivatives Under Solvent-Free Conditions
No full textOne-pot synthesis of tri- and tetrasubstituted imidazoles using eutectic salts as ionic liquid catalyst
No full textNovel nano-titania embedded on graphite (nano-TiO2@Cg) as an efficient, eco-friendly, and recyclable catalyst for one-pot, solvent-free synthesis of 4-aryl-3,4-dihydroquinolin-2(1H)-ones, 3-methyl-4-aryl/alkyl-2,4,5,7-tetrahydropyrazolo[3,4-b]pyridin-6-ones, and coumarin-3-carboxylic esters
No full textp-TSA@nano SiO2 as a New and Efficient Nanocatalyst for the One-Pot Multi-component Synthesis of Some Novel 1-Amidoalkyl-2-Naphthols Under Solvent-Free Conditions
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