(–)-1-Phenylethyl retinoate shows a Cotton effect with c.d. bands at 360, 245, and 215 nm, whereas (+)-octan-2-yl retinoate has no such band in the 220–450 nm region. This can be explained either in terms of a dipole–dipole interaction between the phenyl and retinylidene moieties or in terms of the dissymmetric environment of the polyene. The results are pertinent to the origin of c.d. in rhodopsins.
A. K. Singh, J. Chem. Soc., Perkin Trans. 2, 1986, 635 DOI: 10.1039/P29860000635
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