par Boué, Stéphane 
;Gielen, Marcel ;Nasielski, Jacques
Référence Bulletin des Sociétés chimiques belges, 73, 11-12, page (864-873)
Publication Publié, 1964
;Gielen, Marcel ;Nasielski, Jacques Référence Bulletin des Sociétés chimiques belges, 73, 11-12, page (864-873)
Publication Publié, 1964
Article révisé par les pairs
| Résumé : | The reaction between iodine and hexamethyl or hexabutyl ditin is very fast in methanol; the rate is measurable in acetone containing sodium iodide. The rate law is a sum of two terms, the first of which is of first order in both I2 and hexaalkyl ditin, and inverse first power in iodide ion; this term shows a moderate positive salt effect. The second term is of zero order in iodine, and apparently second order in hexaalkyl ditin; it is shown that this second order is in fact a catalytic term due to dialkyltin oxyde present in the starting material; the catalyzed reaction is strongly accelerated with increasing ionic strength. Transition states for both paths are suggested, and the proposed mechanisms imply an electrophilic attack on tin for one reaction and a nucleophilic substitution on the metal for the other. Copyright © 1964 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim |
