In a reversal of the Perlin effect, the values of 1JC–H for the equatorial protons at C(3) and C(6) in 1,2,4-trioxanes are less than those for the corresponding axial protons; this is ascribed to homoanomeric interactions between equatorially directed nonbonding electron pairs on oxygen and the equatorial C(3)–H or C(6)–H σ* orbitals.
J. E. Anderson, A. J. Bloodworth, J. Cai, A. G. Davies and N. A. Tallant, J. Chem. Soc., Chem. Commun., 1992, 1689 DOI: 10.1039/C39920001689
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