par Pianet, Isabelle;Fouquet, Éric;Pereyre, M.;Gielen, Marcel 
;Kayser, François;Biesemans, Monique;Willem, Rudolph
Référence Magnetic resonance in chemistry, 32, 10, page (617-623)
Publication Publié, 1994-10
;Kayser, François;Biesemans, Monique;Willem, Rudolph Référence Magnetic resonance in chemistry, 32, 10, page (617-623)
Publication Publié, 1994-10
Article révisé par les pairs
| Résumé : | (2-Ethoxycarbonyl)crotylbromodichlorostannane (1) and (2-ethoxycarbonyl)allylbromodichlorostannane (2), two compounds with formula RSnCl2Br, were shown by 2D phase-sensitive EXSY 119Sn NMR to undergo halogen exchange, resulting in equilibrium mixtures of RSnCl3, RSnCl2Br, RSnClBr2 and RSnBr3. The unidirectional pseudo-first-order rate constants were determined by two different methods, the initial rate and the exchange matrix resolution approaches. The data show that the exchange proceeds by single halogen exchange, probably occurring through an intermediate involving two organotin trihalide moieties, as evidenced from the linear dependence of the pseudo-first-order rate constants on concentration. The mechanism is briefly discussed. |
