Two epimeric, naturally occurring α-alkylidene-γ-butyrolactones have been prepared from a carbohydrate precursor, using a Wittig reaction to form an exocyclic double bond either with or without epimerisation at the centre α to the olefin, depending on the reaction conditions employed.
W. W. Wood and G. M. Watson, J. Chem. Soc., Perkin Trans. 1, 1990, 3201 DOI: 10.1039/P19900003201
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