Etude par RMN des 2,2′‐Dihalogeno‐Diethylethers—I: Effet de Température

Abstract

NMR spectra of disubstituted ethers with the formula (X-CH,-CH,),O, X = C1, Br, I, have been studied. Spectra of neat liquids at ambient temperature and spectra of these compounds in CS, at different temperatures have been analysed. It has been possible to assign the chemical shifts. In each case, the more populated rotamers have been determined. Additionally, for these three compounds dissolved in CS,, it is shown that the gauche form becomes more stable with cooling. The authors propose a procedure, using spectral decomposition, which allows the analysis of AABB' spectra almost degenerated in AzBz cases.RBsumB-Les spectres RMN d'ethers disubstitues de formule (X-CH,-CH,),O avec X = C1, Br,

Etude par RMN des 2‐2′ ‐Dihalogeno‐diethylethers—II: Effet de Solvant

“…Les spectres de ces composts sont de type AA'BB' et ont ttt dtcrits dans un travail ant6rieur.l Nous garderons par constquent les mCmes notations. Ainsi nous avons: n, + n, = 1 (1) n, Ctant le pourcentage de forme trans et n, celui des deux fornies gauclres tquivalentes (Fig. 1).…”