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A bicyclo[2.2.2]octadiene(BCOD)‐fused bis(dipyrromethane) derivative was reacted with methylal in the presence of trifluoroacetic acid followed by oxidation with chloranil to give a doubly N‐confused phlorin derivative, which did not undergo the retro‐Diels–Alder reaction extruding an ethylene molecule on heating. In contrast, a 7‐tert‐butoxybicyclo[2.2.1]heptadiene(7‐BuOBCHD)‐fused bis(dipyrromethane)...
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