Abstract:Die durch Umsetzung der Ketone (I) mit Dimethylsulfoniummethylid erhältlichen isomeren Cyclopropylepoxide (II) und (III) lagern sich bei kurzem Erhitzen in einem Lösungsmittel oder in Substanz [nur (IIb)/(IIIb) reagieren langsam] oder spontan bei Raumtemperatur in Gegenwart von Spuren p‐Tolu olsulfonsäure (im Lösungsmittel) in die Dihydropyrane (IV) um.
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