to the strong electron-donating effect of acyl groups in acyl
hydrazides. Preparation of 1-acyl-2-pyrazolines using other
catalysts by HSBM is now under investigation.
9 (a) G. Kaupp, M. R. Naimi-Jamal, H. Ren and H. Zoz, Advanced
Technologies based on Self-Propagating and Mechanochemical Re-
actions for Environmental Protection, ed. G. Cao, F. Delogu and
R. Orru, Research Signpost, Kerala, 2003, p. 83; (b) S. Kipp, V.
Sepelak and K. Dieter Becker, Chem. Unserer Zeit., 2005, 39, 384;
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3521.
In conclusion, we have developed an efficient and com-
paratively green strategy for the synthesis of 1,3,5-triaryl-2-
pyrazoline by HSBM. Good yield, short reaction times and
neat conditions are the notable advantages of this method.
Besides, catalyst recovery and reusability is another feature of
this procedure. We believe that this method has provided a better
scope of the synthesis of 1,3,5-triaryl-2-pyrazolines and will be
a more practical alternative to the existing methods for other
organic reactions.
10 B. Rodriguez, A. Bruckmann, T. Rantanen and C. Bolm, Adv. Synth.
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Acknowledgements
We are grateful to the Natural Science Foundation of China
(No. 20676123 and 20876147) and National Key Technology
R & D Program [2007BAI34B00] for financial help.
16 G. Kaupp, M. R. Naimi-Jamal and V. Stepanenko, Chem. Eur. J.,
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Notes and references
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18 Typical procedure: the following components were added to the
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