HOMO–LUMO transitions observed in chiral donor–acceptor spiro compounds 1 and 2 are of the n–π* type, based on the high dissymmetry factor Δε/ε ≅ 10–2 determined from their CD and absorption spectra.
Induction of chirality in donor–acceptor spiro compounds
M. Kwit and J. Gawronski, Mendeleev Commun., 2003, 13, 139 DOI: 10.1070/MC2003v013n03ABEH001756
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