Abstract
AbstractExcited singlet states of bicyclobutylene‐benzene (2), 1,2:4,5‐bis (bicyclo‐butylene)benzene (3), 2,3‐bicyclobutylene‐naphthalene (4), and 1,8‐bicyclobutylene‐naphthalene (5) are investigated by means of linear dichroic absorption spectroscopy of molecules oriented in stretched polyethylene films and by semiempirical model calculations. The results indicate a strong hyperconjugative impact of the bicyclobutylene group on the aromatic chromophores in these compounds. Valence isomerization to aromatic products is predicted as the preferred photochemical pathway.
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