Molecular orbital and strain energy investigations of the photocyclization of 1,2-di-β-naphthylethylene

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Abstract
The formation of 4a,4b-dihydrophenanthrene (II), 10b, 10c-dihydrodibenzo[c,g]phenanthrene (IV), and 14a, 14b-dihydrodibenzo[b,g]phenanthrene (V) and their ground and excited state processes are correlated by MO and strain energy minimalization analyses.