Abstract
The differential chemical shifts (Δae) and geminal coupling constants (Jgem) between axial and equatorial protons of the 2-position CH2 groups in hexahydropyrimidines, hexahydro-1,3,5-triazines, and tetrahydro-1,3-oxazines have been compared with the proportions of lone-pairs axial in these compounds. It is concluded that whereas Δae can provide a qualitative indication of the orientation of lone pairs, no simple quantitative correlation exists. The variations found in Jgem showed no systematic correlation with the conformational equilibrium of adjacent N-alkyl groups, in the compounds now studied.
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