The magnetic nanostructured natural hydroxyapatite (HAP/Fe3O4 NPs): an efficient, green and recyclable nanocatalyst for the synthesis of biscoumarin derivatives under solvent-free conditions

High acidity cellulose sulfuric acid from sulfur trioxide: a highly efficient catalyst for the one step synthesis of xanthene and dihydroquinazolinone derivatives

“…In recent years, catalysts and reagents containing -SO 3 H have received considerable attention and use in organic synthesis. [1][2][3][4] Examples include mesoporous-amorphous silica, 5 mesoporousamorphous carbon 6 and magnetic nanoparticles, 7 etc. This is because they have unique properties, such as wide universality, cheap and easy to obtain raw materials, simple post-processing, and they are eco-friendly.…”

An Insight View on Synthetic Protocol, Mechanistic and Biological Aspects of Biscoumarin Derivatives

“…In this context, Akhlaghinia et al [52] have investigated a one-pot three-component condensation reaction of benzaldehyde with 4HC to form biscoumarin using magnetic nanostructured natural hydroxyapatite (HAP/Fe 3 O 4 ) (Scheme 2: Method 1). The catalyst was synthesized by two burning processes using cow bones.…”

γ‐Fe2O3@HAp@PBABMD@Cu magnetic nanoparticles: Efficient, green, and recyclable novel nanocatalyst for the synthesis of densely functionalized pyrrole‐pyrido[2,3‐d]pyrimidine hybrids

“…2,3 Furthermore, one of the key strategies in the efficient green catalysts field is the design and development of new solids for heterogeneous catalytic processes that meet both efficiency and selectivity criteria while permitting recovery, reactivation, and reuse during numerous cycles, without mass losses. 4,5,6 Among the catalysts or heterogeneous supports, magnetic iron oxide (Fe 3 O 4 and γ-Fe 2 O 3 ) (NPs) have attracted much interest due to their unique attributes, such as superparamagnetic, surface-to-volume ratio, greater surface area, shapes, sizes, sustainable nature, inexpensive, nontoxicity, environmentally, and simple separation methodology. 2,[7][8][9][10][11] To improve the chemical stability as well as to attain some advantages as the versatility in surface modification, MNPs commonly are coated by different organic or inorganic compounds.…”