The intramolecular benzoin condensation of [1,1'-binaphthyl]-2,2'-dicarbaldehyde (5), followed by oxidation with air, provides a new synthesis of (MP)-pentahelicene-7,8-dione (1). With reference to the original preparation of this quinoneviaacyloin condensation, its present yield (73% for the ring-closing step) is considerably increased.
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Modler‐Spreitzer et al. (2000) studied this question.
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