Consumption of natural material as a catalyst obtained from natural sourced material and some novel sulfonic acid functionalized ionic liquids, as a new category of Bronsted acidic ionic liquid explained for heterocyclic synthesis which covers the maximum principles of green chemistry. This book presents, Bael Fruit Ash Water Extract (BFAWE) as a natural sourced base catalyst for the synthesis of 2-amino-4H-benzochromenes and tetrahydro chromeno [4,3-b] chromene-6,8-diones. And [BBSA-DBU] [HSO4]: A novel ionic liquid for synthesis of Xanthenes, pyrazolopyranopyrimidines and quinoxaline.The...