Reaction of 1,2-dicarbonyl compounds with 3-oxoglutarates to yield cis-bicyclo[3.3.0]octane-3,7-dione or [n.3.3]propellanedione (n > 2) tetracarboxylates. Subsequent acid-catalyzed hydrolysis and decarboxylation yield the respective 2,4,6,8-unsubstituted diones:
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