Die cis‐ und trans‐Verbanone (I) reagieren mit Äthylformiat in Gegenwart von Na‐äthylat bei Raumtemperatur und anschließende Hydrolyse zu den Hydroxymethylenketonen (II) (ca 70% Ausbeute), die bei Behandlung mit wäßrigem Forrnaldehyd in Gegenwart von K2CO3 die Methylenketone (III) (80%) ergeben.
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