The Interaction of <i>Walsh</i>‐Orbitols in Diademane and Related Hydrocarbons

Abstract

Abstract To obtain further information concerning the interaction between Walsh ‐orbitols of ‘conjugated’ cyclopropane rings, the photoelectron spectra of the following compounds have been recorded: bicyclo[4.1.0]heptane 1 , cis ‐ and trans ‐tricyclo[5.1.0 3, 5 ]octane 2, 3 , diademane 4 , trans ‐pentacyclo[3.3.2.0 2, 9 .0 4, 10 , 0 6, 8 ]decan 5 and bicyclo[4.1.0]heptene‐2 6 . The first bands in the PE.‐spectra of these compounds have been assigned on the basis of a ZDO HMO‐approximation. For 2 and 4 the value for resonance integral between linked 2p atomic orbitals of two adjacent eclipsed cyclopropane rings is found to be −1.73 eV.