J. Ott, M. Hiegemann, H. Duddeck
Mar 1, 1991
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Journal
Magnetic Resonance in Chemistry
Abstract
The 1H and 13C NMR spectra of 26 2,3‐dihydro‐[1,5]benzoxazepin‐4(5H)‐one derivatives and four thiono analogues are interpreted in terms of conformational equilibria. Similar to 1,3,4,5‐tetrahydro‐2H‐1,5‐benzodiazepin‐2‐ones, these compounds favour boat conformations of the seven‐membered ring. In the lactams the conformational energy difference is very low, whereas a difference of 0.3 kcal mol−1 is recorded for the thionolactams, the conformation with the quasi‐axial methyl group also being preferred.