The electrophilic substitution of chloromethyleniminium ion, termed as the Vilsmeier reaction is feasible on compounds with electron rich substituents.1 View all references Currently, we are engaged in the synthesis of nitrogen heterocycles through the versatility of the DMF–POCl 3 Vilsmeier complex.2 View all references Acyl azides continue to contribute much towards heterocyclic synthesis.[3]8. Lwowski , W. 1969. Chemistry of the Azido Group Edited by: Patai , S. ...