Figure 2From: Intramolecular H-bonding interaction in angular 3-π-EWG substituted imidazo[1,2-a]pyridines contributes to conformational preference Mesoionic structure of 3-acyl oxazolo[3,2-a]pyridinium-2-olate 3 and 2-phenyl imidazo[1,2-a]pyridine with ring atoms numbered for the dihedral angle analysis. Back to article page