A synergetic role of Aegle marmelos fruit ash in the synthesis of biscoumarins and 2-amino-4H-chromenes

A dry rind of Aegle marmelos (bael) fruit ash as a synergetic alternative material to an expensive, toxic and corrosive catalysts for the synthesis of biscoumarins and 2-amino-4 H -chromenes at ambient temperature in water is reported. The spectroscopic evidence from EDX, FTIR, XRD and SEM analysis of bael fruit ash supports the presence of metal oxides, carbonates and hydroxides which are intensely responsible for the acceleration of the reactions. The striking features of this protocol are utilization of bio-waste, cost-effective, recyclable and biodegradable catalytic system, which provide good to excellent yields in a short reaction time. Graphic abstract