Abstract
THE direct conjugation between two aromatic nuclei or between an aromatic nucleus and an olefinic double bond expresses itself in the spectrum: diffuse bands appear instead of the sharp ones and at higher wave-lengths (diphenyl1, di-α-naphthyl2, styrene3, etc.). It is therefore worth reporting that 9,9′-diphenanthryl (I), although having a system of two conjugated olefinic double bonds, exhibits a spectrum which is practically identical with that of phenanthrene4 (two regions of absorption: persistent, diffuse bands between 2700 and 3000 A., and sharp bands at higher concentrations, between 3000 and 3500 A.). The same is true for 9-cyclohexenyl-phenanthrene (II), which does not behave spectroscopically analogously to styrene.
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HENRI, V., BERGMANN, E. Ultra-violet Absorption Spectrum and Chemical Reactivity of some Substituted 9-Vinyl-Phenanthrenes. Nature 143, 278 (1939). https://doi.org/10.1038/143278a0
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DOI: https://doi.org/10.1038/143278a0
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