Tandem Knoevenagel–Michael–cyclocondensation reaction of malononitrile, various aldehydes and 2-naphthol over acetic acid functionalized ionic liquid

• Introducing efficient catalysts for the synthesis of 2-amino benzo[h]chromenes.
• Study of TGA, XRD and calculation of size and inter planer distance of the catalysts.
• Generality of the catalysts, high yields and short reaction times.

An efficient solvent-free approach for the synthesis of 2-amino benzo[h]chromene derivatives from the condensation of malononitrile, 2-naphthol and various aldehydes using acetic acid functionalized imidazolium salt (1-carboxymethyl-3-methylimidazolium bromide {[cmmim]Br} as a reusable catalysts is reported. In addition, thermal gravimetric analysis (TGA), differential thermal gravimetry (DTG), powder X-ray diffraction (PXRD) and calculation of size and inter planer distance of the catalyst have been studied in this work.

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