Phosphosulfonic acid (PSA) was found to be an efficient catalyst for the one-pot three-component Hantzsch condensation reaction of arylaldehydes, ethylacetoacetate and ammonium acetate to afford the corresponding 1,4-dihydropyridine and polyhydroquinoline derivatives in high yields. PSA was also applied for the one-pot preparation of polyhydroquinolines via four-component reaction of a...

An efficient synthesis of polyhydroquinoline derivatives was reported via four-component coupling reactions of aldehydes, 1,3-dicarbonyl ketones (dimedone or 1,3-cyclohexanedione), ethyl acetoacetate or methyl acetoacetate and ammonium acetate in the presence of a catalytic amount of nanocrystalline TiO2 under solvent free conditions. The reported method is mild, rapid and has the advantages su...

Sulfonated polystyrene/montmorillonite nanocomposite (OMMT/PS-SO3H) was prepared and used as a novel, efficient and inexpensive heterogeneous acid catalyst in the one-pot reaction three-component Mannich reaction of ketones, aromatic aldehydes and amines under solvent-free conditions. The catalyst was characterized by XRD, SEM, TG, BET and FT-IR techniques. This method has advantages...

Vitrimers have captured broad interest in academia and industry because they offer a compelling combination of mechanical performance, thermal stability, recyclability. They are permanent polym...

Abstract Recycling plays a vital role in preserving resources like steel and consequently circular economy. Scrap dealers mills, the main business units this system, often encounter opposing financial sustainability incentives using scrap as feedstock because regular sorting scrap-preparation infrastructure cannot deal with increasing complexity of scrap. Mismatches between inputs target compos...

• Simple and ecofriendly green synthesis of functionalized superparamagnetic iron oxide nanoparticles. Nanoparticles absorbed the model dyes above 80% efficiency for a wide range conditions 94% optimum conditions. We present successful recyclability by growing nanoparticles on surface polyvinyl alcohol solid support. Widely used water treatment methods are based chemicals that leave residual un...