Expression of concern: Facile route to synthesize FeO@acacia-SOH nanocomposite as a heterogeneous magnetic system for catalytic applications.

Expression of concern for 'Facile route to synthesize FeO@acacia-SOH nanocomposite as a heterogeneous magnetic system for catalytic applications' by Reza Taheri-Ledari , , 2020, , 40055-40067, https://doi.org/10.1039/D0RA07986C.

Facile route to synthesize FeO@acacia-SOH nanocomposite as a heterogeneous magnetic system for catalytic applications.

In this work, a novel catalytic system for facilitating the organic multicomponent synthesis of 9-phenyl hexahydroacridine pharmaceutical derivatives is reported. Concisely, this catalyst was constructed from acacia gum (gum arabic) as a natural polymeric base, iron oxide magnetic nanoparticles (FeO NPs), and sulfone functional groups on the surface as the main active catalytic sites. Herein, a convenient preparation method for this nanoscale composite is introduced.

Magnetic dextrin nanobiomaterial: An organic-inorganic hybrid catalyst for the synthesis of biologically active polyhydroquinoline derivatives by asymmetric Hantzsch reaction.

Dextrin is a low molecular weight polysaccharide obtained from natural resources. Due to exceptional properties such as chemical structure, having extreme reactive functional groups, low cost, commercial availability, non-toxicity and biocompatibility, it can be introduced as a green organocatalyst. The fabrication of hybrid materials from natural polymers and synthetic inorganic materials constructs compounds with new features, abilities and applications.