Condensation of 2-naphtol with arylaldehydes using acetic acid functionalized ionic liquids as highly efficient and reusable catalysts

An efficient solvent-free protocol for the synthesis of 14-aryl-14H-dibenzo[a,j]xanthenes from the condensation of 2-naphthol with arylaldehydes, using acetic acid functionalized imidazolium salts (1-carboxymethyl-3-methylimidazolium bromide ([cmmim]Br) and 1-carboxymethy1-3-methylimidazolium tetrafluoroborate ([cmmim]BF4) as reusable catalysts, has been developed. The turn over frequency on the catalysts is several times higher than the other previously reported catalysts. Also, thermal gravimetric analysis and powder X-ray diffraction pattern of the catalysts have been studied.

Graphical AbstractThe catalytic activity of acetic acid functionalized imidazolium salts as reusable catalysts were investigated for the synthesis of 14-aryl-14H- dibenzo[a,j]xanthenes. Thermal gravimetric analysis and powder X-ray diffraction patterns of the catalysts have been studied in this investigation.Figure optionsDownload full-size imageDownload as PowerPoint slide