1964
DOI: 10.1002/bscb.19640730709
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Application de la Spectrographie R.M.N. À L'Attribution de Configuration Géométrique: Styrènes Substitués

Abstract: SUMMARYThe N.M.R. spectra of five pairs of 4 alkoxy-a, p-dialkylstyrenes of known configuration (general formulae XI and XII) are compared and a set of ru!es suitable for geometric configuration assignmmt in such compounds is deduced:1 . The strong signals in the aromatic AaBz methoxystyrene system are 25-30 CIS apart in the cis isomer and only 13-16 c/s in the trans isomer.2. The olefinic and allylic protons signals are shifted 7-20 c/s downfield in the cis isomer.The origin of the observed shifts is discusse… Show more

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Cited by 20 publications
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“…anisyle remplace le groupe 4-methoxy-2-naphtyle. Or, dans cette derniere skrie, on constate que les C,-H et C,-CH, apparaissent a des champs plus eleves dam les isomeres du type 3 que dans ceux du type 2 [3]. figure 3, represente leurs diffkrentes conformations possibles, selon une projection de Newman dans I'axe de la liaison CI - (formules 2 et 3).…”
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“…anisyle remplace le groupe 4-methoxy-2-naphtyle. Or, dans cette derniere skrie, on constate que les C,-H et C,-CH, apparaissent a des champs plus eleves dam les isomeres du type 3 que dans ceux du type 2 [3]. figure 3, represente leurs diffkrentes conformations possibles, selon une projection de Newman dans I'axe de la liaison CI - (formules 2 et 3).…”
unclassified