✍ Scribed by P. Natalis
No coin nor oath required. For personal study only.
The infrared spectra of cis and trans 1,2-dimethyl-, 1,Zdiethyl-, 1,Zmethylethyl-and 1,2-methyIpropylcyclopentane isomers have been recorded in the frequency range from 400 to 3000 cm-1. Assignments of some fundamentals are possible in a few cases when comparison of the spectra with those of cycloalkanes and other paraffinic hydrocarbons is straightforward. Cis and trans isomers are distinguishable by specific low frequency bands and corresponding combination bands. Other important differences between the infrared spectra of these isomers have been pointed out, mainly vibrations of methyl groups.
Le problbme de I'isomerie geometrique dans les dialcoylcyclanes a kte aborde precCdemment par l'ktude des spectres de masse de quatre couples de 1,2-dialcoylcyclopentanes P) (2) et des ti ois couples de dimethylcyclohexanes substituts en position 1,2-1,3-et I .4 (3).
Le present travail consiste en une etude, par spectrometrie d'absorption dans I'infrarouge des 1,2-dimethyl-, 1,2-diCthyl-, 1 ,2-niethylethyl-et 1,2-mkthylpropylcyclopentanes cis et trans. Les Cchantillons de ces substances, utilises daris ce travail, ont Ct C prepares au laboratoire du Professeur G. Cliiurdoglu i 1'Universite L.ibre de Bruxelles. 11s se sont revelks extremement purs; les spectres iiifrarouges --comme les spectres de masse d'ailleurs (I) --n'ont perinis de dCceler la prksence d'aucune impureti., ni la presence, dans un isomere donne, de trace de l'autre
📜 SIMILAR VOLUMES
Correlations between mass spectra and molecular structure are attempted in a series of cis and trans 1,2-diaIkylcyclohexanes previously investigated. Rather large differences appear between abundances of main fragment ions, especially (P-R1)+ (parent ion having lost the Rl group) and (P-Rl-H)+, some