found that NbSBA-15(2.2pH) has a higher catalytic activity in
the liquid-phase oxidation of 2M1N-OH as compared to other
NbSBA-15 catalysts. From the optimized reaction conditions
over washed NbSBA-15(2.2pH), it is obviously found that a
higher vitamin K3 selectivity can be obtained at 348 K for
17 S. K. Das, M. K. Bhunia and A. Bhaumik, J. Solid State Chem., 2010,
183, 1326.
1
1
8 Y.-J. Li, B. Yan and L. Wang, Dalton Trans., 2011, 40, 6722.
9 H. Wang, Y. Ma, H. Tian, N. Tang, W. Liu, Q. Wang and Y. Tang, Dalton
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20 O. S. Anunziata, A. R. Beltramone and J. Cussa, Appl. Catal., A, 2004,
2
70, 77.
1 R. Song, A. Sorokin, J. Bernadou and B. Meunier, J. Org. Chem., 1997,
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22 M. Selvaraj, J. Kim and T. G. Lee, Stud. Surf. Sci. Catal., 2005, 156,
67.
4
5 min using 1 : 5 ratio of 2M1N-OH to H O with 7 ml of
2 2
2
MeCN. From the studies of different solvents, it is found that
MeCN is the optimal solvent. On the basis of all catalytic
studies, it can be clearly observed that the NbSBA-15(2.2pH)
catalyst is a highly active, recyclable and promising hetero-
geneous catalyst for the selective synthesis of vitamin K3.
6
8
23 O. A. Kholdeeva, O. V. Zalomaeva, A. N. Shmakov, M. S. Melgunov
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Acknowledgements
This work was supported by a 2-year Research Grant of Pusan
National University.
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