Magnetically separable phase-transfer catalysts

Abstract

Magnetic nanoparticles-supported quaternary ammonium and phosphonium salts were prepared and evaluated as phase-transfer catalysts. Some of them exhibited good activities that were comparable to that of tetra-n-butylammonium iodide. The catalysts were readily separated using an external magnet and reusable without significant loss of their catalytic efficiency.

Fe3O4 Nanoparticles-Supported Palladium-Bipyridine Complex: Effective Catalyst for Suzuki Coupling Reaction

“…The various types of organic reactions using the MNPs-supported catalysts that have emerged recently include C-C coupling reactions [17][18][19][20][21][22][23][24], hydroformylation [25,26], hydrogenation [27][28][29][30][31][32][33][34][35], C-N coupling reaction [36,37], oxidation [38][39][40][41][42][43], cleavage of allyl esters and ethers (deallylation catalyst) [44], enantioselective acylation [45], multicomponents Aza-Sakurai reaction [46], the Paal-Knorr reaction [47], CO 2 cycloaddition reactions [48], asymmetric hydrosilylation of ketones [49], and esterification [50]. Other reports of MNPs-supported catalysts include O-Alkylation reaction [51], halogen exchange reaction [52], polymerization reactions [53], enzymes for carboxylate resolution [54], amino acids for ester hydrolysis [55], organic amine catalysts promoting Knoevenagel [56], one-pot reaction cascades [57], and the various acidcatalyzed reactions (deprotection reaction of benzaldehyde dimethylacetal) [58]. Concerning the Suzuki coupling reactions, palladium complexes...…”

Effect of l-arginine on the catalytic activity and stability of nickel nanoparticles for hydrolytic dehydrogenation of ammonia borane

“…The amount of hydrogen evolution does not depend on the amount of L-arginine, while the evolution rate significantly depends on the amount of L-arginine. At the 1st cycle, a stoichiometric amount of hydrogen was evolved in 21,8,8, and 6 min in the presence of the bare Ni catalyst and in the presence of the L-arginine stabilized Ni catalysts with L-arginine 0, 12, 23, and 35 mg, respectively. The results indicate that the Larginine stabilized Ni catalysts show higher hydrogen evolution rates than the bare Ni catalyst.…”

Regulation of dispersion/aggregation of phosphonium-presenting iron oxide nanoparticles by anion exchange

“…[10] After the reaction for 6 h at 60°C, the mixture was Scheme 1. Outlines of the preparation of the SPIOs used in this study.…”