The absorption maxima of retinyl iminium polyene are more strongly affected by non-conjugated positive charge located in the vicinity of the β-ionyl moiety (2) than by those located in the vicinity of carbon atoms 12–14(1).
M. Sheves, T. Baasov and N. Friedman, J. Chem. Soc., Chem. Commun., 1983, 77 DOI: 10.1039/C39830000077
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