Journal
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
Volume 393, Issue -, Pages 240-247Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.molcata.2014.06.025
Keywords
SBA-15/AO/Pd(II); Heterogeneous catalyst; Pd nanoparticles; Suzuki reactions
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Funding
- Bu-Ali Sina University
- Center of Excellence and Development of Chemical Methods (CEDCM)
- Payame Noor University (PNU)
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Herein we described the synthesis of a novel SBA-15/AO/Pd(II) nanocatalyst by grafting of amidoxime on SBA-15 and subsequent deposition of palladium chlorides. Prior to grafting of amidoxime (AO), the prepared [2-cyanoethyl]-functionalized Mesoporous SBA-15 through combining of 2-cyanoethyltriethoxysilane and SBA-15 was treated with hydroxylamine. The amidoxime grafted SBA-15 (SBA-15/AO) were then used as platform for in situ deposition of Pd complex. The materials were characterized by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive X-ray (EDX), inductivity coupled plasma (ICP), nitrogen adsorption-desorption, and Fourier transform infrared (FTIR) spectroscopy. SBA-15/AO/Pd(II) are novel phosphine-free recyclable heterogeneous catalyst for Suzuki coupling reaction of aryl halides (I, Br, Cl) with phenylboronic acid to provide the corresponding products. These cross-coupled products were produced in excellent yields under mild conditions at extremely low palladium loading (similar to 0.2 mol%) with perfect high turnover frequencies (TOFs). The heterogeneous catalyst can be readily recovered by simple filtration and reused six times with loss in its activity. (C) 2014 Elsevier B.V. All rights reserved.
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