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Finally, we have tested the reactivity of citronellol (9a), a non-
activated acyclic primary alcohol (Scheme 3). The reaction oc-
curred at a reasonable rate at 100 °C giving citronellal (9b) in ca.
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The results obtained in the present work are in agreement with
the mechanism generally accepted for the catalysts based on
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alcohol 1a as compared to the secondary alcohol 2a suggests that
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through the ligand exchange between an alcohol and a surface OH
moiety. Another observation that supports this suggestion is the
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alcohol, than that of its position isomer 6a, a secondary allylic alco-
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b-hydride elimination to give a corresponding carbonyl product
and Ru–hydride species. The re-oxidation of the latter by molecu-
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nanoparticles is an effective catalyst for the liquid-phase oxidation
of a wide range of alcohols using environmentally benign molecu-
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additives. The oxidation of various biomass-based monoterpenic
alcohols can give carbonylic terpenoids, useful for fragrance and
pharmaceutical industries, in good to excellent yields. The catalyst
is truly heterogeneous; it can be re-covered magnetically and re-
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Acknowledgments
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The authors would like to express their gratitude to Prof. Pedro
K. Kiyohara (IFUSP) for the use of TEM facilities. This research was
supported by CNPq, CAPES, FAPESP, FAPEMIG, and INCT-Catálise
(Brazil).
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