Synthesis of 4,4'-Arylmethylene-bis(3-methyl-5-pyrazolones) using Diammonium Hydrogen Phosphate as an Efficient and Versatile Catalyst in Aqueous Media
Corresponding Author(s) : Chunguang Yang
ychg58@sina.com
Asian Journal of Chemistry,
Vol. 23 No. 2 (2011): Vol 23 Issue 2
Abstract
A simple and efficient synthesis of 4,4'-arylmethylene-bis(3-methyl-5- pyrazolones) has been accomplished by the tandem Knoevenagel-Michael reaction of arylaldehydes with two equivalents of 5-methyl-2-phenyl-2,4-dihydro-3H- pyrazol-3-one using diammonium hydrogen phosphate as an efficient and versatile catalyst in aqueous media.
Keywords
Diammonium hydrogen phosphate
Knoevenagel reaction
Michael reaction
4,4'-Arylmethylene-bis(3-methyl-5-pyrazolones)
5-Methyl-2-phenyl-2,4-dihydro-3H-pyrazol-3-one
(1)
Yang, C.; Pang, L.; Wang, A. Synthesis of 4,4’-Arylmethylene-bis(3-Methyl-5-Pyrazolones) Using Diammonium Hydrogen Phosphate As an Efficient and Versatile Catalyst in Aqueous Media. ajc 2010, 23, 749-751.
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