Diethyldisulfoammonium chlorometallates as heterogeneous BrOnsted-Lewis acidic catalysts for one-pot synthesis of 14-aryl-7-(N-phenyl)-14H-dibenzo[a,j]acridines

摘要

A new series of BrOnsted-Lewis acidic diethyldisulfoammonium chlorometallates, [DEDSA][FeCl4] and [DEDSA](2)[Zn2Cl6], were synthesized as solid materials from the reaction of [(Et)(2)N(SO3H)(2)][Cl] ionic liquid with transition metal chlorides (FeCl3 and ZnCl2) at 80 degrees C in neat condition for 2 h. The chlorometallates were fully characterized using various spectroscopic and analytical techniques such as Fourier transform infrared, UV-visible and Raman spectroscopies, powder X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray and thermogravimetric analyses, Hammett acidity and elemental analyses. Their catalytic activity was studied as reusable heterogeneous catalysts for the three-component synthesis of novel 14-aryl-7-(N-phenyl)-14H-dibenzo[a,j]acridines under solvent-free conditions at 100 degrees C.