The 1,5‐dicarboxylates (I) are coupled with two equivalents of the methyl acetoacetate (II) dianion to form the intermediate tetraoxodicarboxylates (III) which are directly cyclized, yielding the hydroxytetralones (IV).
Anthrones were oxidatively dimerized with oxygen in the presence of Pb(OAc)2 giving 9,9′-bianthracene-10,10′(9H,9′H)-diones. The dimerization proceeds under mild reaction conditions, and gives products in good yields. Binaphthacenedione and bipentacenedione were also synthesized.
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