FTP, identify this process exemplified by lactam and lactim, and the keto-enol type, by which structural isomers reversibly convert between their two forms.
In general, they exist in substances which possess functional groups that can interact additively and are structured such that intramolecular reaction leads to a stable cyclic system, where the cyclic form generally dominates. It is seen in the conversion of certain alkenic acids into their lactones, and a type not involving a proton shift is that of phtaloyl chloride. FTP, identify this process exemplified by lactam and lactim, and the keto-enol type, by which structural isomers reversibly convert between their two forms.
In general, they exist in substances which possess functional groups that can interact additively and are structured such that intramolecular reaction leads to a stable cyclic system, where the cyclic form generally dominates.
tautomerism (or tautomers)