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Treatment of dodecatrienyne derivatives with [RhCl(CO)2]2 in refluxing toluene effected the cycloisomerization to produce tricyclo[6.4.0.02,6]dodecadienes. The one‐carbon shortened undecatrienyne derivatives, however, afforded bicyclo[6.3.0]undecatriene derivatives instead of tricyclic compounds, the latter of which are well known as a basic skeleton of naturally occurring octanoids. On the basis...