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Relevant academic research and scientific papers

Strongly proton exchanged montmorillonite K10 (H+-Mont) as a solid acid catalyst for highly efficient and environmental benign synthesis of biscoumarins via tandem Knoevenagel–Michael reaction

In this study, synthesis of micro/meso porous acid-activated montmorillonite K10 (H+-Mont) was carried out by the activation of Na+-montmorillonite with HCl (4 M) at the controlled conditions. The prepared H+-Mont clay was

The immobilized Ni(II) species on thiourea functionalized copper ferrite: a reusable nanocatalyst for synthesis of biscoumarins under solvent-free conditions

In this study, nanoparticles of CuFe2O4@SiO2@PTMS@Tu@Ni(II) as the reusable magnetic catalyst were prepared. Synthesis of the Ni(II)–CuFe2O4 system was carried out through a five-step procedure includ

Fabrication and characterization of the immobilized Cu(II) and Ni(II) species on silica-coated copper ferrite: as novel magnetically reusable nanocatalysts toward synthesis of biscoumarins

In this study, we have synthesized magnetically nanoparticles (MNPs) of CuFe2O4@SiO2@AAPTMS@Ni(II) and CuFe2O4@SiO2@AAPTMS@Cu(II). The prepared nanocomposite systems were characterized usin

Efficient synthesis of bis-(4-hydroxycoumarin) using sulfanilic acid as recyclable catalyst in water

A catalytic reaction between aromatic aldehydes and 4- hydroxycoumarin has been developed to form a decent range of functionalized biscoumarin skeletons in excellent yields using sulfanilic acid as reusable catalyst in aqueous media. The catalytic reactio

Caffeine-H3PO4: a novel acidic catalyst for various one-pot multicomponent reactions

Caffeine-H3PO4 along with caffeine-HClO4 and caffeine-HNO3 have been prepared and applied for one-pot preparation of bis(indolyl) methanes, 4,4′-(arylmethylene) bis(1H-pyrazol-5-ols), 3,3′-(arylmethylene) bis(4-hydroxycoumarins), 2,4,5-trisubstituted imidazoles, 1‐amidoalkyl‐2‐naphthols, and polyhydroquinolines. The catalysts were characterized using Fourier-transform infrared (FTIR) spectroscopy, 1H and 13C nuclear magnetic resonance (NMR), powder X-ray diffraction (PXRD) analysis, thermogravimetric analysis (TGA), and liquid chromatography (LC)–mass spectroscopy (MS) techniques. The results indicated high product yield, short reaction time, facile separation of catalyst, and easy work-up procedure, suggesting that caffeine-H3PO4 can be considered to be an efficient acidic catalyst for organic transformations.

Ionic liquid [Dabco-H][AcO] as a highly efficient and recyclable catalyst for the synthesis of various bisenol derivatives: Via domino Knoevenagel-Michael reaction in aqueous media

A simple and highly efficient domino Knoevenagel-Michael reaction procedure for the synthesis of a series of bisenols has been successfully developed. In the presence of 1,4-diazabicyclo[2.2.2]octane (Dabco)-based ionic liquid catalysts, which are environ

Solvent-free synthesis of dihydropyrano[3,2-c]chromene and biscoumarin derivatives using magnesium oxide nanoparticles as a recyclable catalyst

In these research, an efficient one pot approach for the synthesis of dihydropyrano[3,2-c]chromenes and biscoumarins as important heterocyclic compounds with pharmacological and biological properties have been prepared using nanocrystalline magnesium oxid

Phosphotungstic acid: An efficient catalyst for the aqueous phase synthesis of bis-(4-hydroxycoumarin-3-yl)methanes

In this present work, we report that phosphotungstic acid provides a simple, efficient and environmentally benign route is a two-component one-pot domino Knoevenagel-type condensation/Michael reaction between 4-coumarin derivative and an aldehyde in water

Synthesis of 3,3′-arylmethylidenebis-4-hydroxycoumarin derivatives catalysed by KF-montmorillonite

3,3′-Arylmethylidenebis-4-hydroxycoumarins derivatives have been synthesised in good yields by the Michael addition reaction of aromatic aldehydes with 4-hydroxycoumarin in DMF catalysed by KF-montmorillonite.