Sulphated alumina tungstic acid (SATA): a highly efficient and novel heterogeneous mesostructured catalyst for the synthesis of pyrazole carbonitrile derivatives and evaluation of green metrics

Abstract

A novel mesostructured catalyst sulphated alumina tungstic acid (SATA) has been prepared by an easy route.

Organocatalytic chiral polymeric nanoparticles for asymmetric aldol reaction

“…36 Several strategies were investigated, and methods based on enzyme-, antibody-, organometallic-, and organo-catalysis were recently reported. 37,38 The rst successful catalyzed asymmetric aldol reaction with more than 98% enantiomeric excess, (ee) was achieved with tin(II) complexes that were prepared in situ from the addition of tin, (II) triate to L-proline derivatives. 39 O'Reilly and coworkers created new methods to form chiral micelles and nanoparticles for applications in organocatalysis.…”

Functionalized Polyethylene Glycol as a Catalyst for Esterification of Salicylic Acid

“…PEGs combine the benefits of homogeneous catalysis, such as high reactivity, lack of diffusion phenomena, and ease of analysis [16]. Green chemistry principles now motivate researchers to use solid acids with sulfonate groups functionalized solid acids as high-performance, reusable, and environmentally friendly catalysts for chemical syntheses, as green alternatives to toxic and unrecyclable homogeneous acid catalysts [17,18]. catalysts containing -SO 3 H have received considerable attention as environmentally benign and can be used in organic synthesis particularly in the esterification and transesterification of various alcohols due to their higher acidic strength, increased thermal stability, and reduced toxicity [19][20][21][22].…”

Tungstic acid (H4WO5) immobilized on magnetic‐based zirconium amino acid metal–organic framework: An efficient heterogeneous Brønsted acid catalyst for l‐(4‐phenyl)‐2,4‐dihydropyrano[2,3c]pyrazole derivatives preparation

“…H 2 O) on amino group of as‐proposed MIP‐202 (Zr), which benefit from high acidity, high thermal stability, and desirable hydrophobicity, in comparison with the other. [ 28 ] Also, use of magnetite material and tungstic acid refines the low recovery chance of tungstic acid. [ 29 ] Briefly, in this work, we designed a new magnetic nanocatalyst based on the immobilization of tungstic acid onto Zr‐L‐aspartate amino acid MOF grafted L‐(+)‐tartaric acid stabilized Fe 3 O 4 NPs and characterized by Fourier‐transform infrared (FT‐IR), energy‐dispersive X‐ray spectroscopy (EDS), X‐ray diffraction (XRD), field‐emission scanning electron microscopy (FESEM), Brunauer–Emmett–Teller (BET), Barrett–Joyner–Halenda (BJH), zeta potential, TGA–DTA, and vibrating sample magnetometer (VSM) analyses.…”