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Synthetic Communications
An International Journal for Rapid Communication of Synthetic Organic Chemistry
Volume 42, 2012 - Issue 9
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Original Articles

Phosphomolybdic Acid: An Efficient and Recyclable Solid Acid Catalyst for the Synthesis of 4,4′-(Arylmethylene)bis(1H-pyrazol-5-ols)

, , , , &
Pages 1349-1358 | Received 16 Aug 2010, Published online: 11 Jan 2012
 

Abstract

An efficient and environmentally friendly method has been developed for synthesis of 4,4′-(arylmethylene)bis(1H-pyrazol-5-ols) by condensation reaction of aromatic aldehydes with 3-methyl-l-phenyl-5-pyrazolone in the presence of phosphomolybdic acid as a recyclable catalyst in ethanol at ambient temperature in excellent yields.

GRAPHICAL ABSTRACT

ACKNOWLEDGMENTS

The author is thankful to SAIF, Indian Institute of Technology, Mumbai, for providing the spectral facility and the University Grants Commission for providing a research fellowship.

Notes

a Reaction conditions: Benzaldehyde (0.01 mol), 3-methyl-l-phenyl-5-pyrazolone (0.02 mol), phosphomolybdic acid (10 mol%), and solvent (5 vol).

b Yield: isolated.

a Reaction conditions: benzaldehyde (0.01 mol), 3-methyl-l-phenyl-5-pyrazolone (0.02 mol), phosphomolybdic acid (mol%), and solvent (5 vol).

b Yield: isolated.

a Reaction condition: aldehyde (0.01 mol), 3-methyl-1-phenyl-5-pyrazolone (0.02 mol), phosphomolybdic acid (10 mol%), and ethanol (5 vol) at rt.

b Yield: isolated.

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