Under microwave activation, pyrazole??4??carboxaldehydes react with malonic acid in the presence of a small amount of pyridine to give 3??(4??pyrazolyl)propenoic acids in high yields. ... Under microwave activation, pyrazole??4??carboxaldehydes react with malonic acid in the presence of a small amount of pyridine to give 3??(4??pyrazolyl)propenoic acids in high yields. ... View all references or 4.5 h99. Jones , G. 1967. Org. Reactions, 15: 204 [Web of Science ®] View all ...