SEARCH Articles Figures Tables Continuous Paal—Knorr pyrrole synthesis Heterocycle synthesis Paal-Knorr pyrrole Microwave Paal- Knorr synthesis PAAL KNORR Pyrrole synthesis Paal thiophene synthesis Paal-Knorr Pyrrole synthesis Mechanism Paal-Knorr furan synthesis Paal-Knorr synthesis Paal-Knorr synthesis of furans Paal-Knorr synthesis of pyrroles Paal-Knorr synthesis reaction with aldehydes Pyrroles, Paal-Knorr synthesis Thiophenes Paal-Knorr syntheses