Spin-spin coupling constants C-13-C-13 in structural investigations: XXIX.Sterically strained systems: Carcass carbocycles

A calculation was carried out within the framework of self-consistent theor y of finite perturbations SCPT INDO for coupling constants C-13-C-13, and e stimation was performed of orbital hybridization of carbon-carbon bonds in 30 carcass carbocycles: polyhedranes, prismanes, tricycloalkanes, and cuban es. We established that all the compounds studied to a certain degree posse ssed abnormally low s-character of the carbon-carbon bonds that decreased w ith growing dihedral angle and bond length.