Photoelectron spectra of endo‐ and exo‐cyclopropano‐norbornene ( = endo‐ and exo‐tricyclo[3.2.1.02.4]octa‐6‐ene) show that a significant homoconjugation exists between the π‐orbital of the double bond and the symmetric Walsh‐es‐orbital of the cyclopropane ring in the exo‐isomer, whereas the interaction is negligeable in the endo‐derivative.
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Bischof et al. (1971) studied this question.
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