Preparation of and dynamic gearing in cis-1,2-bis(9-triptycyl)ethylene

Article abstract of DOI:10.1016/0040-4039(94)88184-7

The two tortional degrees of freedom about the bond from the bridgehead to the olefinic carbons in cis-1,2-bis(9-triptycyl)ethylene couple slightly less strongly than those in the corresponding methane in spite of the apparently deeper meshing of the two triptycyl moiety, which manifests itself in the unusually large nuclear spin-spin coupling between the olefinic protons.