Krasavin M.; Konstantinov I.
Minimizing Side Reactions in Classical Pyrazole Synthesis from β - Oxonitriles: The Use of Acetylhydrazine.
Letters in Organic Chemistry, Volume 5, Number 7, October 2008 , pp. 594-598.
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http://dx.doi.org/10.2174/157017808785982266
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http://www.ingentaconnect.com/content/ben/loc/2008/00000005/00000007/art00020