Synthesis of Boron Nitride Nanosheets Supported Pd(OAc)2 and the Catalytic Microwaves-assisted Heck Reactions

doi:10.7503/cjcu20190451

Abstract

Abstract:

Using h-BN as starting material, BNNSs were prepared by liquid phase exfoliation, then BNNSs-Schiff were synthesized through surface hydroxylation, amination and aldimine condensation reaction. Pd@BNNSs-Schiff were obtained by complexing BNNSs-Schiff with Pd ²⁺. The structure and morphology of the catalyst were characterized by means of Fourier transform infrared spectroscopy(FTIR), laser-Raman spectrum, X-Ray diffraction(XRD), thermogravimetric analyzer(TGA), X-Ray photoelectron spectroscopy(XPS), scanning electron microscopy(SEM), transmission electron microscopy(TEM), elemental distribution analysis(EDS mapping). The Pd@BNNSs-Schiff composite was used for microwave-assisted Heck reaction and the optimized conditions were investigated. When the molar ratio of styrene and iodobenzene was 1.25∶1, the dosage of catalyst(Pd) was 0.08%, and the highest yield of 1,2-diphenylethylene was 96.5% with N,N-dimethylformamide formide as solvent, triethylamine as acid-binding agent under 450 W power microwave irradiation for 20 min. The cataly-tic activity was significantly better than the Pd@GO-Schiff(78.3%) prepared by the same method. Furthermore, the catalytic performance of Pd@BNNSs-Schiff maintained a high level after 6 cycles, but that of Pd@GO-Schiff decreased sharply after 3 cycles and was inactived after 7 cycles.

Key words: Hexagonal boron nitride(h-BN), Heck reaction, Microwave-assisted, Pd(OAc)₂, Organic-modified

CLC Number:

O644.2

TrendMD:

GAN Siping, LI Guohua, ZHAI Jiaxin, ZHANG Xueming, ZHU Mengmeng, HU Enyan, ZHANG Xiaorui, ZHANG Jingru. Synthesis of Boron Nitride Nanosheets Supported Pd(OAc)₂ and the Catalytic Microwaves-assisted Heck Reactions[J]. Chem. J. Chinese Universities, 2019, 40(11): 2314.

Figures/Tables 8

Fig.1 FTIR different region spectra of h-BN(a), BNNSs(b), BNNSs-OH(c), BNNSs-NH2(d), BNNSs-Schiff(e) and Pd@BNNSs-Schiff(f)

Fig.2 Raman spectra of h-BN(a), BNNSs(b), BNNSs-OH(c), BNNSs-NH2(d), BNNSs-Schiff(e) and Pd@BNNSs-Schiff(f)

Fig.3 XRD patterns of h-BN(a), BNNSs(b), BNNSs-OH(c), BNNSs-NH2(d), BNNSs-Schiff(e) and Pd@BNNSs-Schiff(f)

Fig.4 XPS spectra of B1s of the h-BN(A) and BNNSs-OH(B), Si2p(C), Pd3d(D) and C1s(E) XPS spectra of the Pd@BNNSs-Schiff and XPS spectra of pristine h-BN, BNNSs-OH, and Pd@BNNSs-Schiff(F)

Fig.5 TGA curves of h-BN(a), BNNSs(b), BNNSs-OH(c), BNNSs-NH2(d), BNNSs-Schiff(e) and Pd@BNNSs-Schiff(f)

Fig.6 TEM images of BNNSs(A) and Pd@BNNSs-Schiff(B), EDS mapping of C(C), O(D), Si(E), Pd(F) of Pd@BNNSs-Schiff

Fig.7 Heck reaction of iodobenzene and styrene

Fig.8 Reusability of Pd@BNNSs-Schiff and Pd@GO-Schiff(A) and ICP-OES results(B) of Pd2+ content in two catalytic system solutions under microwave irradiation

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Synthesis of Boron Nitride Nanosheets Supported Pd(OAc)₂ and the Catalytic Microwaves-assisted Heck Reactions

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