4
Tetrahedron
2003, 125, 8340-8347; (c) Narayanan R.; El-Sayed, M. A. J. Phys.
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catalytic activity was improved significantly when converting
palladium precursor K2PdCl4 to PdNPs. Moreover, in comparing
with naked PdNPs or PVP coated PdNPs, the modification of
TPPTS on PdNPs enhanced the catalytic activity significantly.
4. (a) Wang, F.; Mielby, J.; Richter, F. H.; Wang, G. H.; Prieto, G.;
Kasama, T.; Weidenthaler, C.; Bongard, H. J.; Kegnaes, S.;
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8648; (b) Yun, G.; Hassan, Z.; Lee, J.; Kim, J.; Lee, N. S.; Kim,
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According the above experiment results, we proposed the
following explanation: the catalytic activity of PdNPs-HCOONa
is decided by the following two aspects; one is the size of
nanoparticles is small enough to contribute more surface atoms;
another key point is the surface of nanoparticles should be
covered by TPPTS, which could stable the nanoparticles and also
further activated the surface palladium atoms; that is, the
catalytic specious in our case should be the TPPTS coordinated
surface atoms on the palladium nanoparticles.
6. Handa, S.; Andersson, M. P.; Gallou, F.; Reilly J.; Lipshutz, B. H.
Angew. Chem., Int. Ed., 2016, 55, 4914-4918.
7. (a) Tang, W.; Capacci, J. A. G.; Wei, X. D.; Li, W. J.; White, A.;
Patel, N. D.; Savoie, J.; Gao, J. J.; Rodriguez, S.; Qu, B.; Haddad,
N.; Lu, B. Z.; Krishnamurthy, D.; Yee, N. K.; Senanayake, C. H.
Angew. Chem., Int. Ed., 2010, 49, 5879-5883; (b) Xu, G. Q.; Fu,
W. Z.;. Liu, G. D; Senanayake, C. H.; Tang, W. J.; J. Am. Chem.
Soc., 2014, 136, 570-573; (c) Hu, N. F.; Li, K.; Wang Z.; Tang,
W. J. Angew. Chem., Int. Ed., 2016, 55, 5044-5048.
8. Chen, W.; Li, P. H.; Wang, L. Tetrahedron 2011, 67, 318-325.
9. (a) Tamura, M.; Fujihara, H. J. Am. Chem. Soc., 2003, 125,
15742-15743; (b) Mori, K.; Kondo, Y.; Yamashita, H. Phys. Chem.
Chem. Phys., 2009, 11, 8949-8954; (c) Sawai, K.; Tatumi, R.;
Nakahodo, T.; Fujihara, H. Angew. Chem., Int. Ed., 2008, 47,
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Q. H. Org. Lett., 2006, 8, 3605-3608; (b) Wu, L.; Li, Z. W.;
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Conclusion
In summary, a water dispersible PdNPs with TPPTS as
stabilizer was developed. The resulted PdNPs can catalyse the
Suzuki-Miyaura reaction in aqueous media. The catalytic
activity was depended on the size of PdNPs and the smallest
PdNPs reduced by HCOONa gives the highest catalytic activity.
TPPTS acted not only as a stabilizer, but also an activator for
PdNPs. This work provided a new insight into the design
concept of the green nanocatalyst, water dispersible and size
control.
We gratefully acknowledge funding of this research by the
Basic Research Development Program (2013CB834504), the
National Natural Science Foundation of China (Nos. 91427302,
21321063) and “Strategic Priority Research Program” of the
Chinese Academy of Sciences (XDB12020200).
Acknowledgments
We gratefully acknowledge funding of this research by the
Basic Research Development Program (2013CB834504), the
National Natural Science Foundation of China (Nos. 91427302,
21321063) and “Strategic Priority Research Program” of the
Chinese Academy of Sciences (XDB12020200).
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