The absolute configuration of (+)-1,5-dicarboxy-9,10-dihydro-9,10-ethenoanthracene (IV) was shown to be 9R,10R by chemical correlation with (–)-2,5-diacetoxy-7-carboxytriptycene (V) whose configuration was proved to be 1S,6R by X-ray analysis by the Bijvoet method combined with chemical correlation.
Y. Shimizu, H. Tatemitsu, F. Ogura and M. Nakagawa, J. Chem. Soc., Chem. Commun., 1973, 22 DOI: 10.1039/C39730000022
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