PdII on Guanidine-Functionalized Fe3O4 Nanoparticles as an Efficient Heterogeneous Catalyst for Suzuki–Miyaura Cross-Coupling and Reduction of Nitroarenes in Aqueous Media
journal contributionposted on 2021-12-09, 07:31 authored by Guddappa Halligudra, Chitrabanu C. Paramesh, Ravi Mudike, Mallesha Ningegowda, Dinesh Rangappa, Prasanna D. Shivaramu
This paper presents guanidine-functionalized Fe3O4 magnetic nanoparticle-supported palladium (II) (Fe3O4@Guanidine-Pd) as an effective catalyst for Suzuki–Miyaura cross-coupling of aryl halides using phenylboronic acids and also for selective reduction of nitroarenes to their corresponding amines. Fe3O4@Guanidine-Pd synthesized is well characterized using FT-IR spectroscopy, XRD, SEM, TEM, EDX, thermal gravimetric analysis, XPS, inductively coupled plasma-optical emission spectroscopy, and vibrating sample magnetometry analysis. The prepared Fe3O4@Guanidine-Pd showed effective catalytic performance in the Suzuki–Miyaura coupling reactions by converting aryl halides to their corresponding biaryl derivatives in an aqueous environment in a shorter reaction time and with a meagerly small amount of catalyst (0.22 mol %). Also, the prepared Fe3O4@Guanidine-Pd effectively reduced nitroarenes to their corresponding amino derivatives in aqueous media at room temperature with a high turnover number and turnover frequency with the least amount of catalyst (0.13 mol %). The most prominent feature of Fe3O4@Guanidine-Pd as a catalyst is the ease of separation of the catalyst from the reaction mixture after the reaction with the help of an external magnet with good recovery yield and also reuse of the recovered catalyst for a few cycles without significant loss in its catalytic activity.
Read the peer-reviewed publication
thermal gravimetric analysisinductively coupled plasmagood recovery yieldconverting aryl halides22 mol %).13 mol %).corresponding biaryl derivativescorresponding amino derivativesoptical emission spectroscopymeagerly small amounthigh turnover number4 sub3 subshorter reaction timepaper presents guanidineefficient heterogeneous catalystii supcorresponding aminesturnover frequencyleast amountir spectroscopysupported palladiumroom temperaturerecovered catalystreaction mixtureprominent featuremagnetic nanoparticleexternal magneteffective catalystcatalytic activityaqueous mediaaqueous environment