Interactions intramoleculaires—XXX. Etude vibrationnelle des conformères de cyclohexénes monosubstitués en 4

Add time:07/21/2019    Source:sciencedirect.com

Infrared and Raman spectra of 4-cyano cyclohexenes d0 and d4-(3,3,6,6) and 4-methyl cyclohexene have been recorded in the liquid state and, for the two first products, in the crystalline state at low temperature. These experimental results and the effect of temperature on the Raman line intensities of 4-methyl cyclohexene, allow us to characterize the spectra of each conformer. The comparison of these spectra with those of 4-chloro and 4-bromo cyclohexenes indicates 24 sequences of common frequencies corresponding to fundamental vibrations of cyclohexene. For each pair of conformers the difference between the sum of squares of these fundamental frequencies is lower than 1%. The identification of conformers is made by analogy with 4-chloro cyclohexene for which the ν(CCl) frequencies are characteristic of the equatorial or axial conformation of chlorine.

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