The conformational analysis of saturated heterocycles. Part XXVI. 2-Substituted benzodioxans

Abstract
The coupling constants obtained from the 13C satellite spectra of benzodioxan show that the heterocyclic ring exists in the two rapidly inverting half-chair conformations. A consideration of the coupling constants in 1H n.m.r. spectra of some 2-substituted benzodioxans shows that a number of substituent groups prefer the pseudo-axial position.

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