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M. M. Heravi et al. / Tetrahedron Letters 50 (2009) 662–666
7. Hanan, G. S.; Vilkmer, D.; Schubert, U. S.; Lehn, J.-M.; Baum, G.; Fenske, D.
All the products were identified by comparison of their physical
Angew. Chem., Int. Ed. 1997, 36, 1842; Bassani, D. M.; Lehn, J.-M.; Baum, G.;
Fenske, D. Angew. Chem., Int. Ed. 1997, 36, 1845; Semenov, A.; Spatz, J. P.;
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and spectroscopic data with those of authentic samples.19,26,27
Reusability of the catalyst: At the end of the reaction, the catalyst
could be recovered by filtration. The recycled catalyst was washed
with dichloromethane and subjected to a second reaction process.
To confirm that the catalyst had not dissolved in the solvent the fil-
tered catalyst was weighed before reuse and the results showed
that the catalyst was not soluble in CH3CN. Table 4 compares the
efficiency of H6[PMo9V3O40] in the synthesis of pyrimidines over
five runs. The results show that the yield of product after five runs
was only slightly reduced.
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Acknowledgement
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M.M.H. gratefully acknowledges partial financial support from
the presidential office project no 87066/26.
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