In order to examine the paratropic nature expected for a thirteen-membered ring system arising from polarization of the carbonyl group, the two benzannelated bisdehydro [13] annulenones, VI and IX, were prepared respectively by the aldol condensation of an appropriate aldehyde and an appropriate ketone followed by the oxidative coupling of the resulting acyclic ketone containing terminal acetylene groups. The NMR spectra indicate ...
