Substitution électrophile armatique. VI. Détermination des constantes σ+ pour les groupes Si(CH3)3 et Sn(CH3)3

Abstract
Rates of reaction between iodine and p‐trimethylsilyl‐ and p‐trimethylstannyl‐phenyl‐trimethyltin in methanol have been determined. These rates show that for the (CH3)3Si‐ substituent, the donor inductive effect and the withdrawing mesomeric effect of the metal cancel each other; for the (CH3)3Sn substituent, the donor inductive effect is preponderant.