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environmental and economic impacts and chemoselec-
tivity. In conclusion, the present results on the acylation
of alcohols demonstrate the efficiency of ZnO as an inex-
pensive reusable green catalyst and constitutes a useful
alternative to commonly accepted procedures.
8. Jin, T.-S.;Ma, Y.-R.;Zhang, Z.-H.;Li, T.-S.
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General experimental procedure for benzoylation: To a
mixture of alcohol or phenol (10 mmol) and ZnO
(10 mol %) was added benzoyl chloride (11 mmol) with
stirring at ꢀ40 ꢁC. The progress of the reaction was fol-
lowed by TLC. After completion of the reaction (Table
2), the resulting mixture was extracted with EtOAc
(2 · 5 ml) and filtered to remove ZnO. The organic layer
was washed with 10% NaHCO3 and water, dried with
Na2SO4 and concentrated in vacuo to give the product.
All of the benzoate esters are known and were character-
ized by comparison of their spectral and physical data
with those of authentic samples.
10. Dalpozzo, R.;DeNino, A.;Maiuolo, L.;Procopio, A.;
Nardi, M.;Bartoli, G.;Romeo, R. Tetrahedron Lett. 2003,
44, 5621, and references cited therein.
11. MohammadPoor-Baltork, I.;Aliyan, H.;Khosropour,
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12. Orita, A.;Tanahashi, C.;Kakuda, A.;Otera, J.
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Chem., Int. Ed. 2000, 39, 2877.
13. Lee, S.;Park, J. H. J. Mol. Catal. A: Chem. 2004, 223.
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mun. 2003, 6, 764.
15. Chakraborti, A. K.;Gulhane, R. Synlett 2004, 4, 657.
16. Chakraborti, A. K.;Gulhane, R.;Shivani, R. G. Synthesis
2004, 1, 111.
17. Bandgar, B. P.;Kamble, V. T.;Sadavarte, V. S.;Uppalla,
L. S. Synlett 2002, 5, 735.
18. Ghosh, R.;Swarupananda, M.;Chakraborty, A. Tetra-
hedron Lett. 2005, 46, 177.
19. Torregiani, E.;Gianfranco, S.;Minassi, A.;Appendino,
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22. Sabitha, G.;Reddy, B. V. S.;Srividya, R.;Yadav, J. S.
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General experimental procedures for acetylation: To a
mixture of alcohol or phenol (10 mmol) and ZnO
(10 mol %) was added acetyl chloride (12 mmol) with
stirring at room temperature. The progress of the reac-
tion was followed by GC. After completion of the reac-
tion (Table 3), the products were isolated either as
described above or by the addition of NaHCO3 (10%)
and water, separation of the organic layer and drying
it with Na2SO4. All of the acetate esters are known
and gave the same spectral data as authentic samples.
23. (a) Kartha, K. P. R.;Field, R. A. Tetrahedron 1997, 53,
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Acknowledgements
24. Yamada, S.;Sugaki, T.;Matsuzaki, K.
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We gratefully acknowledge the support of this work by
the Yazd University Research Council.
25. (a) Ballini, R.;Bosica, G.;Carloni, S.;Ciaralli, L.;Maggi,
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