[()TD$FIG]
830
G. Chehardoli et al. / Chinese Chemical Letters 22 (2011) 827–830
Scheme 3.
ꢁ
+
could not. Literature survey indicates that the mixture of H SO and NO generates NO2 ion [22]. Thus we proposed
2
4
3
+
thatthereaction mechanism proceedsviainsitu generation of NO . A reasonable mechanism for the nitration of phenols
in the presence a mixture of melamine-(H SO ) or PVP-(H SO ) and NH NO is outlined in Scheme 3.
2
2
4 3
2
4 n
4
3
3
. Conclusions
Melamine-(H SO ) and PVP-(H SO ) are two superior proton source considering convenience, cost
2
4 3
2
4 n
effectiveness and simplicity of their production procedure. Also, they are insoluble in most of the organic solvents
and are excellent proton mediated sources for the organic reactions under heterogeneous conditions. As illustrated in
table, the acidic powers of these solid acids are very good and are comparable with silica sulfuric acid as well as other
known acids. Also, in this paper we reported mono- and di-nitro bisphenol A for the first time.
Acknowledgments
This paper was extracted from the MSc theses of Ebadollah Alizadeh and Seyedeh Bahareh Azimi. The authors
acknowledge financial support for this work from the research affairs of Hamedan University of Medical Sciences,
Hamedan, I.R. Iran and partial support of this work by the Research Affairs Office of Bu-Ali Sina University (Grant
number 32-1716 entitled development of chemical methods, reagent and molecules.) Hamedan, I.R. Iran.
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