In the title compound C(14)H(17)N(3)O(2), the dihedral angle between the rings is 16.68 (13)°. Although the compound crystallizes in the keto form, the possibility of keto-enamine-enol-imine tautomerism is explained by a strong intra-molecular N-H⋯O hydrogen bond.

the kinetics and mechanism of the reaction of 5-nitro-1h-benzo[d] imidazole to produce 6-nitro-1h-benzo[d] imidazole was studied by employing hybrid meta-density functional theory. mpwblk/6-31+g** level calculations were carried out to obtain energies and optimize the geometries of all stationary points along the pes, and determine the harmonic vibrational frequencies. two transition states (ts...

Prototropy tautomerism and E/Z-stereoisomerism of 2-iminothiazolidin-4-ones was extensively studied in the literature during the past several decades. This tautomerism was studied for both alkyl/aryl–amino/imino-substituted thiazolidinones/ thiazolinones by several authors (Comrie, 1964; Åkerblom, 1967; Chowdry et al., 2000; Mornon & Raveau, 1971; Ramsh et al., 1978) in the solid state, as well...

The influence of anions on tautomerism in benzimidazole containing anion receptors has been studied via a variety of techniques in both solution and the solid state. The results show that hydrogen bonding interactions between the receptors and guests have a significant effect of the nature of the tautomer present. The compounds show a preference for complexation of lactate over pyruvate.