Eine intermolekulare Dieckmann‐ Kondensation des symm. Diesters (IIIa) in Gegenwart von Na‐K‐Legierung in siedendem Benzol liefert den cyclischen Bis‐β‐ketoester (IV) in bemerkenswert hoher Ausb., ein Acyloin entsteht unter diesen Bedingungen nicht.
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