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Abstract trans‐Δ2‐Anhydromevalonic acid (XVII) was prepared by a Wittig reaction, starting from (4‐tetrahydro‐2‐pyranyloxy)‐2‐butanone. On the other hand, the corresponding 4‐acetoxy‐2‐butanone gave, under similar conditions, the cyclohexene derivative V, explainable by a twofold Michael addition of the Wittig reagent to methyl vinyl ketone, followed by an intramolecular alcol condensation.
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Keller‐Schierlein et al. (1972) studied this question.
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