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g-Fe O3 or g-Fe O @SiO
2
nanoparticles (3 g). Chlorosul-
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2
2
3
fonic acid (1.1636 g, 0.0099 mol) was added dropwise over
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1
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perature 908C). The aldehyde (1 mmol), b-keto ester
(
2 mmol), ammonium acetate (1.5 mmol) and g-Fe O -SO H
2 3 3
(
25 mg) were added to a glass reactor (ca. 25 mL). The reac-
2
010, 49, 7786–7789; g) A. Schatz, O. Reiser, W. J.
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3
3
moved onto the stirrer bar steadily and the reaction mixture
turned clear within 10 s. The catalyst could be isolated by
simple decantation. The reaction mixture was treated with
brine solution, then extracted with ethyl acetate (2ꢁ20 mL).
After evaporation of the solvent, the crude product was re-
2
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2
3
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[
Acknowledgements
1
The authors acknowledge Semnan University Research
Council, Bu-Ali Sina University Research Council (Grant
Number 32-1716), Center of Excellence in Development of
Chemical Methods (CEDCM), and National Foundation of
Elites (BMN) for support of this work. We also highly appre-
ciate the valuable help of Dr. Hormozi-Nezhad for the DLS.
Also we acknowledge to Professor A. R. Massah for his gen-
erous support.
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