Short Communication
309
It is reasonable to assume that the present reaction is initiated by the oxidative cleavage of
the silicon-silicon bond in hexamethyldisilane to the corresponding bromotrimethysilane in the
presence of PVPP-Br2 complex [20]. The in situ generated bromotrimethylsilane reacted with
benzylic alcohols to afford benzyl bromide derivatives. The spent resin could be converted back
to the starting polyvinylpyrrolidone complex after washing with organic solvent as depicted in
(Scheme 3).
CONCLUSIONS
In conclusion, crosslinked polyvinylpyrrolidone-bromine complex is stable, non-hygroscopic,
easy to prepare and handle, and represent an efficient and selective brominating reagent for
preparation of benzyl bromide derivatives in the presence of hexamethyldisilane.
ACKNOWLEDGEMENTS
We are grateful to Islamic Azad University, Rasht branch and University of Mazandaran for
financial assistance of this work.
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Bull. Chem. Soc. Ethiop. 2012, 26(2)