51. “Electronic States of Phenylene and Naphthylene Bicyclobutanes. Linear Dichroism in Stretched Polyethylene”
    Spanget-Larsen, J.; Gubernator, K.; Gleiter, R.; Thulstrup, E. W.; Bianco, B.; Gandillon, G.; Burger, U.
    Helv. Chim. Acta 1983, 66, 676-686.

Excited 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.

DOI : 10.1002/hlca.19830660231 

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