8
of 9
LEI ET AL.
has been reported previously. The results in Table 3 indi-
cated that the prepared Cu@PQP-NHC exhibited much
better catalytic activities and reusability than previously
reported solid Cu catalysts. In term of the physicochemi-
cal properties of the Cu@PQP-NHC, its superior catalytic
performance should be assigned to the relatively large
surface areas, hierarchical pore structure, and excellent
swelling property.
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In summary, a promising approach for the oxidative car-
bonylation of methanol to dimethyl carbonate was devel-
oped using copper coordinated in N-heterocyclic
carbene-functionalized porous organic polymer as a
robust and active catalyst. The new catalyst was synthe-
sized through a simple copolymerization and successive
immobilization method. Physicochemical characteriza-
tions suggested that the prepared catalyst featured rela-
tively large surface areas, hierarchical pore structure, and
excellent swelling property. Under optimal reaction con-
ditions, the solid catalyst displayed high catalytic activity
for the oxidative carbonylation of methanol, which out-
performed commercial CuCl and previously reported
solid Cu catalysts. In addition, the catalyst showed negli-
gible Cu leaching and could be reused at least 10 times
without significant loss of catalytic activity. Thus, this
protocol provided not only an active, robust, and recycla-
ble solid catalyst for the oxidative carbonylation of meth-
anol to dimethyl carbonate, but also paved a way for
developing efficient heterogeneous catalysts for other oxi-
dative carbonylation reactions.
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ACKNOWLEDGMENTS
This work is financially supported by National Natural
Science Foundation of Guizhou Province (qiankehejichu
[
2018]1414 and [2016]1133, qiankeheLHzi [2015]7608
and [2015]7629); the Scientific and Technological Innova-
tion Platform of Liupanshui (52020-2018-03-02 and
[25] Q. Sun, Z. Dai, X. Liu, N. Sheng, F. Deng, X. Meng, F. S. Xiao,
J. Am. Chem. Soc.2015, 137, 5204.
[26] Y. Lei, G. Leng, G. Li, Z. Li, D. Zhu, Appl. Organomet.
5
2020-2017-02-02); the Academician Workstation of
Liupanshui Normal University (qiankehepingtairencai
2019]5604 hao), and Guizhou Key Laboratory of Coal
Chem.2020, 34, e5397.
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27] E. Peris, Chem. Rev.2017, 118, 9988.
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Clean Utilization (qiankehepingtairencai [2020]2001).
We also thank Youming Ni at the Dalian Institute of
Chemical Physics for beneficial discussions.
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