Abstract
A novel Suzuki-Miyaura (S-M) cross-coupling catalyst (rGO-8 C-TPP-Pd) was prepared by grafting organopalladium complexes with long and flexible chains onto the surface of reduced graphene oxide (rGO) by carbon-carbon covalent bonding. The catalyst was characterized by FTIR, Raman, UV-Vis, TGA, SEM and nitrogen adsorption techniques, respectively. rGO-8 C-TPP-Pd has been used in a variety of S-M coupling reactions. The results showed that it had excellent catalytic activity for various substrates with different substituent groups or substituent positions in ethanol/water mixed solvent at room temperature. Under the optimized reaction conditions, the coupling reaction yield of 4-methyl biphenyl was more than 98 % with iodobenzene and p-tolylbonoric acid as substrates. Even if rGO-8 C-TPP-Pd was recycled for 10 times, the product yield decreased by only 10.4 %, and the chemical structure of the catalyst was basically unchanged. This novel catalytic system provides a new strategy for the design and preparation of supported catalysts.
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