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Table 2 Topological Parameters for BCP found between H-5 and O for conformers 6a and 7a and values for an electrostatic hydrogen bond (feature values)

From: Intramolecular H-bonding interaction in angular 3-π-EWG substituted imidazo[1,2-a]pyridines contributes to conformational preference

Topological Parameter Compound 6a Compound 7a Feature Value
ρBCP 0.017 0.014 0.002-0.040
2ρBCP 0.060 0.049 0.024-0.139
d H· · · Y 2.26 2.32 H· · · O < 2.61