Norbornane‐ or norbornene‐fused 2‐aryldihydro‐1,3‐oxazines, ‐1,3‐oxazin‐2‐ones and – 1,3‐oxazine‐2‐thiones were synthesized and studied by 1H and 13C NMR spectroscopy to reveal the spectral effects of the saturation of the skeleton, diexo or diendo ring annellation and isomerism in compounds containing the oxygen and nitrogen hetero atoms in isomeric positions.
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Sohár et al. (1987) studied this question.
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