Abstract
A Pd-Co bimetallic alloy encapsulated in melamine-based dendrimer supported on magnetic nanoparticles denoted as γ-Fe2O3@MBD/Pd-Co was synthesized by a facile co-complexation-reduction method and characterized sufficiently. The catalytic evaluation of γ-Fe2O3@MBD/Pd-Co showed promising results in the Mizoroki–Heck and Buchwald–Hartwig amination reactions of various iodo-, bromo- and challenging chloroarenes in aqueous media. The synergetic cooperative effect of both Pd and Co and dispersion of the catalyst in water due to the encapsulation of γ-Fe2O3 by melamine-based dendrimer lead to high catalytic performance compared with the monometallic counterparts. The dispersion of the magnetic catalyst also facilitates the recovery and reuse of the catalyst by ten consecutive extraction and final magnetic isolation with no loss of catalytic activity, keeping its structure unaltered.
Highlights
A Pd-Co bimetallic alloy encapsulated in melamine-based dendrimer supported on magnetic nanoparticles denoted as γ-Fe2O3@melamine-based dendrimers (MBD)/Pd-Co was synthesized by a facile co-complexationreduction method and characterized sufficiently
Based on the results and fully characterization of the catalyst and other previous c ontributions[11,69], we tentatively proposed a plausible mechanisms for Mizoroki–Heck and Buchwald–Hartwig amination reactions in the presence of γ-Fe2O3@MBD/Pd-Co (Scheme 2)
In this work, melamine-based dendrimer supported on γ-Fe2O3 magnetic nanoparticles was efficiently employed as a suitable material for the in situ preparation of palladium-cobalt nanoparticles by reduction with NaBH4
Summary
A Pd-Co bimetallic alloy encapsulated in melamine-based dendrimer supported on magnetic nanoparticles denoted as γ-Fe2O3@MBD/Pd-Co was synthesized by a facile co-complexationreduction method and characterized sufficiently. Continuing with our research on the design and the preparation of novel and attractive catalytic systems to conduct environmentally friendly cross-coupling reactions[4], we have surveyed the catalytic activity of a novel γ-Fe2O3@MBD/Pd-Co as the first magnetically recyclable Pd/Co bimetallic catalyst in the Mizoroki–Heck coupling reactions. Using the optimized reaction conditions, the scope of Mizoroki–Heck cross-coupling reaction catalyzed by γ-Fe2O3@MBD/Pd-Co was investigated by employing various aryl halides to react with olefins in water (Table 3).
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