The condensation reaction of 4-oxo-(4H)-1-benzopyran-3-carbaldehydes and of aromatic aldehydes with 3-methyl-1-phenylpyrazolin-5-(4H)-one were carried out in an ionic liquid, ethylammonium nitrate, at room temperature in shorter times with higher yields of 78–92 and 70–75%, respectively, than found using conventional procedures.
R. V. Hangarge, D. V. Jarikote and M. S. Shingare, Green Chem., 2002, 4, 266 DOI: 10.1039/B111634G
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