Abstract:Abstract-The effect of alkyl groups (Me, Et, i-Pr, t-Bu) on the ortho methyl proton chemical shifts is shown to be linearly correlated with the Taft (E,) scale in model compounds 1. RBsum6-L'effet des groupements alkyle de la serie Me, Et, i-Pr, t-Bu sur le dtplacement des hydrogenes d'un groupe mkthyle, situe en ortho, est relit lineairement aux parametres d'effets steriques (E,) de Taft dam des structures du type 1.
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