Cubane from cyclooctatetraene

Cyclooctatetraene from cubane, 203 point group of, 6 Cyclooctatrienone, 289 co-Cyclooctene IP, 102... 

Let us close this account of simple prismanes with a look at hexaprismane. The synthesis of cubane was reported in 1964 pentaprismane was said (1974) to show extraordinary synthetic inaccessibility [16], but was made in 1981 [13] and hexaprismane has so far (early 2007) resisted all attempts at synthesis [5]. As Hopf points out [5], hexaprismane can in principle be assembled from two benzene rings or from cyclobutadiene and cyclooctatetraene ... 

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