Substitution Électrophile Aliphatique II. Influence de l'effet stérique dans la bromo et l'iododemétallation de dérivés alcoylés de l'étain (1)

The rates of the reactions of tetraalkyltins (R 4 Sn) with bromine in dimethylformamide and acetic acid solutions and with iodine in acetic acid are found to depend on steric effects (k Me > k Et > k nPr ) , caused by the R 3 Sn leaving group. Trialkyltin bromides (R 3 SnBr) are cleaved by bromine in acetic acid in a reactivity sequence (k Me < k Et > k nPr ) which is best explained by an increasing importance of inductive...