Triflic acid‐functionalized silica‐coated magnetic nanoparticles [γ‐Fe2O3@SiO2‐TfOH] were readily prepared and identified as an effictive catalyst for the transformation of aldehydes or ketones into their corresponding gem‐dihydroperoxides with 30% aqueous hydrogen peroxide. The catalyst was easily separated by magnetic decantation and the recovered catalyst was reused for seven cycles without significant loss of catalytic activity.
A simple and efficient protocol for one-pot three-component coupling of isatoic anhydride, amines, and aldehydes in water using magnetically recoverable Fe(3)O(4) nanoparticles is reported. This methodology results in the synthesis of a variety of 2,3-dihydroquinazolin-4(1H)-ones in high yields. The catalyst can be recovered and recycled without a significant loss in the catalytic activity.
NbCl 5 has been found to be a very effective catalyst for the synthesis of a variety of α-aminophosphonates through the Kabachnik-Fields reaction of carbonyl compound, amine and diethyl phosphite under solvent-free conditions.
A new protocol has been developed for the synthesis of arylboronates by a coupling reaction of aryl halides and bis(pinacolato)diboron using bis(triphenylphosphine)palladium dichloride/sodium acetate/polyethylene glycol 600 [Pd(PPh 3 ) 2 Cl 2 /NaOAc/PEG 600] as an efficient catalytic system.
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