86
A.R. Kiasat, S. Nazari / Journal of Molecular Catalysis A: Chemical 365 (2012) 80–86
character. Thus in water, hydrophobic central cavities of -CD units
in -CDPU polymer can be act as microvessel and accommodate
nonpolar alkyl halides. On the other hand, the interior of the -
CD cavity may be more hydrophobic because nonbonding electron
pairs of the glycosidic oxygen are present along with a high elec-
tron density and Lewis-base properties. Thus the outer OH of the
-CD cavity formed complexes with cations and these complexes
cause the anion to be activated.
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In the present work, -cyclodextrin–polyurethane polymer
grafted onto Fe3O4 magnetic nanoparticles were successfully pre-
pared and their performance as solid–liquid phase-transfer catalyst
for nucleophilic substitution reactions of benzyl halides in water
was investigated. With the host effects of -CD and superparam-
agnetism of iron oxide, -CDPU-MNPs are expected to have higher
potential applications in substitution reactions of benzyl halides.
The results revealed that water insoluble nanomagnetic polymer
brush catalyst combine easy availability, good stability and excel-
lent catalytic activity that represent a valid alternative to the water
soluble -CD. In conclusion, we have developed a easy way to oper-
ate, safe and cost-effective method for the preparation of benzyl
thiocyanates, azides, cyanides and acetates in water by nucleophilic
substitution reaction. Extensive research to use this nanomagnetic
solid–liquid phase transfer catalyst system in organic transforma-
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course.
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Acknowledgement
We are grateful to the Research Council of Shahid Chamran Uni-
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