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intensity ratios confirmed the good attachment of RuO2NPs on
the surface of GNPs. XRD and XPS revealed that the Ru was in
15 +4 oxidation state with a nano-crystalline nature of RuO2NPs.
The N-oxidation of tertiary amines could be carried out
effectively with as low as 0.13 mol% of supported Ru catalyst for
a wide range of substrates. To the best of our knowledge, this is
the lowest amount of Ru used for the N-oxidation reaction. The
20 proposed catalyst was chemically as well as physically very
stable, heterogeneous in nature and could be reused up to 5 cycles.
In summary, we have developed a heterogeneous Ru based
nanocatalytic system for the N-oxidation of tertiary amines,
which requires only a lower amount of catalyst (0.13 mol% of
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Acknowledgements
This work was supported by the grant-in-aid for global COE
program by the Ministry of Education, Culture, Sports, Science,
and Technology, Japan. R.K. thanks DST (Govt. of India) for
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