Long-range couplings in the 1,3-dioxan series are reported. A clear demonstration of these couplings is given by preparing symmetrical and unsymmetrical spiro-analogues of the dioxans, to render magnetically identical protons non-identical. Coupling constants found are unusually large for saturated, unstrained systems, and a possible effect of the electronegativity of substituents is discussed.
J. E. Anderson, J. Chem. Soc. B, 1967, 712 DOI: 10.1039/J29670000712
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