ABSTRACT Prototropic tautomerism together with rotational and geometrical isomerism are considered for cyclic and acyclic compounds containing the amidine moiety [-NH-C(R)=N-]. Different methods based on the experimental and theoretical data for estimation of the tautomeric equilibrium constant (KT) are reviewed. Recent results obtained in the gas phase by theoretical methods shed new light on the problem of structural and solvation effect.
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