ArticleIn situ generation of trityl carbocation (Ph3C+) as a homogeneous organocatalyst for the efficient synthesis of 4,4′-(arylmethylene)-bis(3-methyl-1-phenyl-1H-pyrazol-5-ol)s

Add time:08/24/2019    Source:sciencedirect.com

Trityl chloride (Ph3CCl) efficiently catalyzes the condensation of 3-methyl-1-phenyl-1H-pyrazol-5(4H)-one and aromatic aldehydes under mild and solvent-free conditions, affording 4,4′-(arylmethylene)-bis(3-methyl-1-phenyl-1H-pyrazol-5-ol)s in high to excellent yields and in short reaction time. The presence of the requisite organocatalytic trityl carbocation (Ph3C+) species was confirmed by analysis of infrared, 1H NMR, and ultra violet spectral data. A plausible mechanism was proposed for the reaction based on the observations and literature precedent.

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