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In this research, initial production and characterization of a novel Brønsted-acidic ionic liquid, namely,  N , N , N ′, N ′-tetramethylethylenediaminium- N , N ′-disulfonic acid hydrogen sulfate ([TMEDSA][HSO 4 ] 2 ), has been described (characterization was achieved using Fourier-transform infrared spectroscopy,  1 H nuclear magnetic resonance (NMR),  13 C NMR, and mass and thermal gravimetric spectra). Thereafter, utilization of [TMEDSA][HSO 4 ] 2  as a highly effectual catalyst for the synthesis of 4,4′-(arylmethylene)-bis(3-methyl-1-phenyl-1 H -pyrazol-5-ol) derivatives through the one-pot pseudo five-component reaction of phenylhydrazine (2 eq.) with ethyl acetoacetate (2 eq.) and arylaldehydes (1 eq.) in relatively mild conditions, has been reported.

zeitschrift für naturforschung b

Efficient pseudo five-component synthesis of 4,4′-(arylmethylene)-bis(3-methyl-1-phenyl-1 H -pyrazol-5-ol) derivatives promoted by a novel ionic liquid catalyst