Kinetics and mechanism of the reaction between dibenzyl triselenocarbonate and oxygen-bases |
| |
| Authors: | F.A. Devillanova G. Verani L. Henriksen |
| |
| Affiliation: | Istituto Chimico Policattedra, Via Ospedale 72, 09100, Cagliari, Italy;Department of General and Organic Chemistry, University of Copenhagen, The H.C. Ørsted Institute, DK-2100 Copenhagen, Denmark |
| |
| Abstract: | The base-induced solvolysis of dibenzyl triselenocarbonate in DMSO/water (4:1) has been studied by UV spectrophotometric measurements under pseudo-first order conditions, using KOH, Me4NOH, Bu4nNOH and Bu4nNHCO3 as bases. The reaction is first order with respect to the substrate as well as to the base. Rate constants and activation parameters for the four bases indicate that the rate determining step is the nucleophilic attack by the base, as an ionic couple, on the substrate. Fast reactions, due to strong nucleophilic selenolate species, may follow this slow step; a tentative mechanism is proposed on the basis of experimental evidence. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
