3
Table 2. MoO3 Nanorods (C) Catalyzed Nucleophilic Fluorination of Various Substrates.
References and notes
1.
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Over all based on these obtained results, the plausible mechanism
of MoO3 nanoparticle catalyzed fluorination with sulfonate ester
substrates depicted in figure 2. The reaction may proceed by
hydrogen bonding formation of oxygens of sulfonate ester with
surface area of MoO3-nanocatalyst. This surface co-ordination of
substrates assist the attack of solvated fluorine nucleophile in
chemo-selective by SN2-fasion.
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Conclusions
In conclusion, we have developed an efficient molybdenum oxide
catalyzed nucleophilic fluorination, which gave the reasonable
yield of fluorinated product when substrate contained sulfonate
ester as a leaving group. MoO3 NPs in rods shape (C) was found
to be more active and showed superior catalytic activity with
respect to reaction time and yield when compared with
conventional methods using 18-crown-6 ether as a phase-transfer
catalyst. Further studies are in progress to develop more
effective catalysts of MoO3 by heterogenous protocol for other
organic transformations.
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Acknowledgments
S.S.Shinde would like to thank Department of Science and
Technology (DST), India for financial grant no. SB/FT/CS-
042/2013 and SR/S2/RJN-111/2012. We are grateful to Director
CSIR-NCL for his encouragement.
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