employed reaction conditions. The ICP analysis of spent catalyst
after the fourth cycle showed ∼1.92 wt.% of Pd in the catalyst
further confirming that Pd leaching into the organic phase is neg-
ligible. Moreover, the recycled catalyst was checked for elemen-
tal analysis to study the leaching of the APTMS, if any. The
obtained results were %C: 43.78, %H: 6.82, %N: 10.59. This
confirms the stable functionalization of APTMS in the AFCTS
and the increase in %C can be attributed to the adsorption of
substrate or/and products. In order to check any loss of APTMS
from the AFCTS-2Pd, the fresh catalyst was taken in toluene and
the supernatant solution was separated. In the separated super-
natant solution salicylaldehyde was added and the solution was
checked by UV-vis spectroscopy for a characteristic imine peak.
No characteristic imine peak was observed, indicating that there
is no loss of APTMS from the AFCTS-2Pd catalyst.
7 M. Bartok and K. L. Lang, in: A. Weissberger and E. C. Taylor (ed.), The
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8
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4
1
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The catalytic hydrogenation of styrene oxide to 2-phenyl ethanol
by Pd supported on a chitosan catalyst was investigated. Chito-
san has been modified using APTMS avoiding the use of acid or
alkali. The Pd supported on modified chitosan was found to be
an efficient catalyst compared to the Pd supported on non func-
tionalized chitosan for the selective preparation of 2-PEA. The
more basic site in AFCTS with respect to the non-functionalized
counterpart provided better selectivity thus leading to high 2-
phenyl ethanol selectivity (97–98%) at total conversion of
styrene oxide under optimized conditions. The catalyst was sep-
arated and effectively used up to five cycles without significant
loss in its activity and selectivity.
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Authors are thankful to analytical section of the institute for
assistance with analyses and CSIR for financial support under
CSIR Network Programme NWP 010. AAD and NS thank to
CSIR, New Delhi, for the award of Senior Research Fellowship.
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Dalton Trans., 2012, 41, 2910–2917 | 2917