Synthesis of the cis- and trans-isomers of 2,6-divinyltetrahydropyran is described. Conformational analysis by n.m.r. spectroscopy has given the activation free energy of ring inversion, ΔG‡= 8.7 kcal mol–1(36·4 kJ mol–1) for the trans-isomer.
G. C. Corfield, A. Crawshaw, S. J. Thompson and A. G. Jones, J. Chem. Soc., Perkin Trans. 2, 1973, 1549 DOI: 10.1039/P29730001549
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