Abstract
A simple and efficient one-pot synthetic protocol for the 4,4′-(arylmethylene)bis(1H-pyrazol-5-ol)s was developed by condensation reaction of aromatic aldehydes, ethyl acetoacetate, and phenylhydrazine/hydrazine hydrate catalyzed by 2-hydroxy ethylammonium propionate under solvent-free conditions. The remarkable features of this new protocol are high yields, short reaction times, easy workup, reusability of inexpensive ionic liquid, and environmentally benignancy.
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