Transfer of Chirality in Complexes with
<i>D</i>
<sub>3</sub>
Symmetry: Kinetics of the Formation Reaction of Chiral Tris[
<i>O</i>
,
<i>O′</i>
‐bis(2‐methylbutyl)dithiophosphato]chromium(III) Complexes (Λ,Δ)‐[Cr{(±)‐Mebdtp}
<sub>3</sub>
], Δ‐(+)
<sub>589</sub>
‐ and Λ‐(–)
<sub>589</sub>
‐[Cr{(+)‐(
<i>S</i>
)(
<i>S</i>
)‐Mebdtp}
<sub>3</sub>
]
作者:Paolo Biscarini、Michele Benedetti、Reiko Kuroda、Francesco Ferranti
DOI:10.1002/ejic.200501062
日期:2006.8
formation reaction using the enantiopure ligand, as well as in the final equilibrium state, show a prevalence of the Λ-(–)589-[Cr(+)-(S)(S)-Mebdtp}3] over the Δ-(+)589-[Cr(+)-(S)(S)-Mebdtp}3] diastereoisomer in all solvents used. A mechanism is proposed which involves two parallel pathways each consisting of three consecutive reactions of solvent substitution by a chiral chelated ligand, interconnected
手性外消旋和非对映异构标题配合物(Λ,Δ)-[Cr(±)-Mebdtp}3]和Λ-(-)589-[Cr(+)-(S)(S)-的形成反应Mebdtp}3],在过量外消旋体 (±)-Mebdtp- 或对映体纯配体 (+)-( S)(S)-Mebdtp– = O,O'-双[(+)-(S)-2-甲基丁基]二硫代磷酸根离子,在 25 °C 下,在各种溶剂(乙醇、四氢呋喃、氯仿/乙醇,9:1)中) 和不同的 pH 值和反应物浓度。外消旋配合物 (Λ,Δ)-[Cr(±)-Mebdtp}3] 的形成反应动力学显示了三个连续的反应步骤。相对伪一级速率常数以不同方式取决于配体和 H+ 浓度。使用对映体纯配体在形成反应期间测量圆二色性,以及在最终平衡状态下,显示 Λ-(-)589-[Cr(+)-(S)(S)-Mebdtp}3] 超过 Δ-(+)589-[Cr (+)-(S)(S)-Mebdtp}3]