L'intermediaire de reaction un metallocyclobutane mono ou disubstitue par un groupe methyl n'a pas de configuration preferentielle pour le monosubstitue et prefere prendre la configuration trans pour le disubstitue
L'intermediaire de reaction un metallocyclobutane mono ou dissubstitue par un groupemethyl n'a pas de configurationpreferentielle pour le monosubstitue et preferrede prendre la configuration trans pour le dissubstitue
Mild and Selective Deuteration and Isomerization of Alkenes by a Bifunctional Catalyst and Deuterium Oxide
作者:Gülin Erdogan、Douglas B. Grotjahn
DOI:10.1021/ja903519a
日期:2009.8.5
H/D exchange is achieved at allylic positions of alkenes using D2O in acetone and alkene isomerization catalyst 1, which features a bifunctional imidazolylphosphine. The basic nitrogen of the latter is thought to deprotonate an alkene substrate coordinated to the CpRu center; at this stage the protonated nitrogen could undergo H/D exchange with deuterium oxide. An exceptional degree of deuteration is achieved at positions accessible to isomerization, with a high degree of control. Using biphasic settings one can literally wash out reactive protons on the substrate without using organic solvents.
Synthesis of 2-Butene-2,3-<i>d</i>
<sub>2</sub>and 2-Butene-1,1,1,4,4,4-<i>d</i>
<sub>6</sub>