Die Bedeutung der R�ntgenstrukturanalyse im Bereich der organischen Chemie

Hengstenberg, J.; Mark, H.

doi:10.1007/bf01503764

Cited by 5 publications

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“…Such an effect is, indeed, beyond dispute in the crystals of conjugated compounds. Thus, the crystals of quinhydrone, which contain a conjugated system indefinitely extended in one direction (Hengstenberg 1932), have very low refractive indices for vibrations in either of the principal planes perpendicular to this axis; but they are almost opaque to light vibrating in the direction of the parallel double bonds, for which the refractive index rises above 2 (Bernal). It is also known, from the work of R. Kuhn on bixin and on crocetin (1932,1933), that conjugated systems with a cis-configuration are relatively unstable and are readily converted (e.g.…”

Section: Ch2= C H -C H = C H -C H = C H 2 X I Hexatrienementioning

confidence: 99%

Refractive dispersion of organic compounds IX—Optical exaltation in unsaturated hydrocarbons containing conjugated double bonds

1937

Proc. R. Soc. Lond. A

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One of the ultimate aims of the present investigations of refractive dispersion is to elucidate the phenomenon of “optical exaltation” in organic compounds containing conjugated systems of alternate single and double bonds, as observed by Gladstone in 1881 and defined by Brühl in 1907. A first step was taken in Part IV (Allsopp 1934 a ) when dispersion curves were plotted over a wide range of wave-lengths for two compounds of the cyclohexane series, viz. cyclohexene (I), which contains a single olefinic double bond, and cyclohexadiene (II), with two conjugated olefinic double bonds:

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Section: Ch2= C H -C H = C H -C H = C H 2 X I Hexatrienementioning

confidence: 99%