Abstract
AbstractThe 1H and 13C NMR spectra of some alkyl carboxylates of amino‐substituted dihydrobenzoxazepine thiones and dihydrobenzodiazepine thiones were recorded in CDCI3, and DMSO solutions, and the complete spectral assignments performed with 1D and 2D techniques. A solvent‐dependent tautomerization was established for the oxazepine derivatives, whereas the diazepines existed in the same tautomeric form in both solvents. The tautomeric structures are stabilized by strong intramolecular hydrogen bonding. Differences in the CH couplings are related to the stereochemistry of the tautomeric structures.
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