Wadsworth–Emmons reactions of 6-methoxytetrahydropyran-3-one 2 and 5-arylthio-6-methoxytetrahydropyran-3-ones 5–9 have been investigated and the ratio of (E)- and (Z)-α,β-unsaturated esters formed has been shown to be affected by the presence and type of arylthio substituent.
P. L. L. Tudanca, K. Jones and P. Brownbridge, J. Chem. Soc., Perkin Trans. 1, 1992, 533 DOI: 10.1039/P19920000533
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