The geometries of trimethylenetriasterane 1, triasteranetrione 2, and trispirocyclopropanetriasterane 3have been determined by X‐ray crystal structure analyses. All three compounds have D3hsymmetry and contain two skeletal cyclopropane rings which are symmetrically cis‐trisubstituted. The vinyl and the carbonyl substituents in 1and 2apparently exert about the same acceptor effect on the central cyclopropane rings and cause a small but significant lengthening of the endocyclic C‐C bonds (1.517 Å in 1and in 2) in comparison to an average normal bond length in cyclopropanes of 1.508 Å, while in 3no effect of the spirocyclopropane groups on the bond length in the central rings (1.506 Å) is evident The vinylcyclopropane and bicyclopropyl subunits in 1and 3respectively are ideally antiperiplanar and almost undistorted with respect to the parent hydrocarbons as evidenced by the bond angles and 13C‐13C coupling constants (1JCC).