BAYAT ET AL.
9 of 10
increase the physical adsorption of Ag nanoparticles,[35–
[3] G. T. Barreiro, M. Fernández, Oxidation of Alcohols to Alde-
hydes and Ketones: A Guide to Current Common Practice,
Springer, Berlin 2006.
37]
and thus the loading of Ag nanoparticles was about
2.62 wt% with respect to our previous work (about
1.48 wt%).[20] Mechanistic studies of alcohol dehydroge-
nation using Ag nanoparticles supported on SiO2,[38]
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[5] A. Tanaka, K. Hashimoto, H. Kominami, J. Am. Chem. Soc.
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Al2O3
and Fe3O4@SiO2
surfaces indicate that Ag
nanoparticles along with the hydroxyl groups available
on the surfaces can participate simultaneously in
dehydrogenation of alcohols. In order to gain an insight
into the activity of polymer (without Ag nanoparticles
on it) in dehydrogenation reaction, a blank test was
prepared and applied in benzyl alcohol dehydrogenation
reaction. Our results showed that the activity of the
polymer (without Ag nanoparticles on it) in dehydroge-
nation of benzyl alcohol is less than 5% at 24 h. Thus, it
can be concluded that the effect of polymer in the
absence of Ag nanoparticles in dehydrogenation of
alcohols is negligible.
[6] Y. Sasano, S. Nagasawa, M. Yamazaki, M. Shibuya, J. Park, Y.
Iwabuchi, Angew. Chem. Int. Ed. 2014, 53, 3236.
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with Metal Compounds, Springer, New York 2013.
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134, 3643.
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4.3 | General procedure for oxidant‐free
alcohol dehydrogenation
[15] Y. Sawama, K. Morita, T. Yamada, S. Nagata, Y. Yabe, Y.
An amount of 2 mg of SMNP‐PVP‐Ag catalyst was added
into 3 ml of toluene and sonicated for 10 min. Then,
1 mmol of alcohol was added to the mixture in a reaction
vessel fitted with a condenser, and the system was placed
under argon. The resulting mixture was vigorously stirred
under reflux conditions until completion of the reaction.
The reaction completion was followed using GC. In each
case, after completion of the reaction, the catalyst was
separated by applying an external magnetic field. The res-
idue was then evaporated in vacuum and the crude prod-
uct was purified by SiO2 column chromatography
(EtOAc–n‐hexane, 1:9) to afford the desired product. All
reaction products were known in the literature and iden-
tified by GC chromatograms, FT‐IR spectra and melting
points as compared with authentic samples. In order to
reuse the SMNP‐PVP‐Ag catalyst, the catalyst was col-
lected using an external magnetic field, washed succes-
sively with ethanol and water, dried under vacuum at
50C for 10 h and then used directly for the next run.
Monguchi, H. Sajiki, Green Chem. 2014, 16, 3439.
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