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- W1509398049 abstract "L'évaluation des effets d'environnement sur les fréquences vc=o, mesurées à 1'état liquide de 41 cétones aliphatiques saturées, est recherchée par deux types différents de corrélations. Le premier, basé sur les paramétres de réactivité (mesurant les effets inducteur, stérique et d'hyperconjugaison) conduit à des expressions contradictoires, quoique quantitativement aussi acceptables. Cependant, un effet propre aux cétones α,α'-ditertiaires [noté (A3)1.(A3)2], lié vraisemblablement à l'ouverture de l'angle , apparaît dans tous les cas. Le second (corrélations homogènes), ne nécessitant aucune hypothèse sur la nature des mécanismes d'interaction, compare les différentes populations RiCORj (caractérisées par le radical Rj) à une population de référence (RiCOMe) et conduit à la relation: Two correlation methods have been applied to the evaluation of the environmental effects on the carbonyl frequency of 41 saturated aliphatic ketones in the liquid phase. Correlations based on reactivity parameters lead to mutually contradictory, but quantitatively equally acceptable, expressions of the frequency in terms of inductive, steric and hyperconjugation effects. However, an effect peculiar to α,α'-ditertiary ketones denoted (A3)1(A3)2 and related to the opening of the angle, is apparent in all cases. Homogeneous correlations, requiring no hypothesis regarding the nature of the interactions, are based on the comparison of different populations RiCORj (characterised by the radical Rj) with a reference population (RiCOMe), and lead to the equation:" @default.
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- W1509398049 date "1969-12-01" @default.
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- W1509398049 title "Relation entre la topologie et la fréquence vc=o des cé- tones aliphatiques saturées" @default.
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