A. Ohtaka et al. / Journal of Molecular Catalysis A: Chemical 360 (2012) 48–53
53
5th cycled reactions reached 237. After the workup, the aqueous
filtrate exhibited no catalytic activity for the oxidation. However,
when the reaction solution was analyzed by ICP-AES after every
run to determine the amount of Pt leaching during the reaction,
the total amount of Pt leaching after the fifth run was <1.0%.
For 1-phenylethanol, 1-indanol, and aliphatic alcohols, it needed
5.0 mol% Pt of 1a to achieve good conversions (entries 7–11).
In addition, a similar catalytic activity was observed on using a
does not inhibit the catalytic activity.
Since PS-PtNPs were proved to function efficiently for the aero-
bic alcohol oxidation in water, the hydrogen-transfer reduction of
organic compounds [44–46] was also investigated. Transfer hydro-
genation, which uses H donors instead of hazardous H2, is an
attractive methodology. 2-Propanol is most widely used as a hydro-
gen donor since it is cheap, nontoxic, volatile, and is converted
to acetone, which is environmentally friendly and easy to remove
from the reaction system. The hydrogenation of cinnamic acid was
carried out at 70 ◦C in the presence of 1a (5.0 mol% of Pt), 1.5 equiv
of KOH, and 5.0 equiv of 2-propanol in water (Scheme 1). The reduc-
tion of cinnamic acid was accomplished in 20 h to afford 3-phenyl
propionic acid in 99% yield. In contrast, the conversion of cinnamic
acid was low (34%) when using 2-propanol as a sole solvent. The
transfer hydrogenation of trans-stilbene gave bibenzyl in 99% yield.
When acetophenone and nitrobenzene were used as substrate,
diphenylmethanol and aniline were obtained in 81% and 99% yields,
respectively.
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Linear polystyrene was proven to be a useful stabilizer for PtNPs.
XRD analysis and TEM observation indicated the formation of PtNPs
on polystyrene. PS-PtNPs have high catalytic activity for the aero-
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Appendix A. Supplementary data
Supplementary data associated with this article can be
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