The nickel-catalysed coupling of 2-, 3-, and 4-bromotropone gave the corresponding bitropones in moderate yields; 2,2′-bitropone was converted b;y trifluoromethanesulphonic anhydride into dicyclohepta[b,d]furan dication, a novel tricyclic dication system.
M. Iyoda, K. Sato and M. Oda, J. Chem. Soc., Chem. Commun., 1985, 1547 DOI: 10.1039/C39850001547
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