Guanidine Acetic Acid Functionalized Magnetic Nanoparticles: Recoverable Green Catalyst for Transamidation

Abstract

In the presence of a catalytic amount of Fe3O4‐Guanidine acetic acid (GAA) nanoparticles, efficient transamidation of several amides with various amines is described under solvent‐free conditions. Fe3O4‐Guanidine acetic acid nanoparticles provide the first example of a magnetically recoverable organocatalyst for transamidation in the highest catalytic activity. The catalyst could be simply recycled with the assistance of an external magnet and reused for six runs without significant loss of its catalytic activity.

Highly Efficient and Stable CsPbTh3 (Th = I, Br, Cl) Perovskite Solar Cells by Combinational Passivation Strategy

“…In addition, the peak around 3408 and 1665 cm −1 for pure guanidinium iodine (GAI) powder and GAI‐doped CsPbTh 3 powder corresponds to N—H bending and N═H stretching vibrations, respectively, indicating that the GA cation is successfully doped into CsPbTh 3 perovskite lattice. [ 44 , 45 ] The peak at 1622 cm −1 is related to the C═N stretching vibration of GCA in CsPbTh 3 film, [ 46 ] which suppose us to speculate that GCA is at the grain boundaries and on the surface of the CsPbTh 3 film to passivate the defects.…”

Innovative application of magnetically modified bovine horn as a natural keratin resource in the role of value-added organocatalyst

“…For instance, Varma et al 16 synthesized a magnetic organocatalyst based on glutathione via a simple sonication instrument at room temperature and deployed it successfully for the Paal–Knorr reactions, aza-Michael reactions, and pyrazole synthesis. Kazemi Miraki et al 8 developed a supported guanidine acetic acid on the magnetic nanoparticles as an organocatalyst for transamidation of different carboxamides with amines under no solvent conditions. Moreover, Gawande et al 15 described utilizing l -cysteine-based magnetic organocatalyst as a heterogeneous organocatalyst to prepare amino carbonyl compounds.…”

“…Therefore, the application of different catalyzed methods using metals, transition metals, biocatalyst, and organocatalyst in transamidation has been studied by many researchers over the last years. 7–11 To date, numerous catalysts have been used to facilitate the transamination process. Compared with different mentioned catalysts, organocatalysts have been considered by chemists.…”

“…Amino acids, peptides, vitamins, ureas, carbenes, and phase-transfer agents are some effective organic molecules that are utilized as an organocatalyst in many chemical syntheses. 8,12 In organocatalysed reactions, the separation and reuse of catalysts are problematic due to the trouble in the recovery of catalysts from the reaction mixture. As a result, by immobilization of the organocatalysts on a solid inert support, such challenges could be solved with ease.…”

Surface functionalization of magnetic nanoparticles via palladium‐catalyzed Diels‐Alder approach

“…Rapid development in the nanosciences including preparation, identification and applications of metal nanoparticles is occurring in recent century. Magnetic core/shell nanoparticles (NPs) are promising heterogeneous catalysts through their extreme surface area and unique size‐dependent properties . They could also be easily separated from the reaction mixture, which includes sensitive natural products or biomaterials, through their magnetic feature ,.…”