Trimethylsilyl-Substituted Hydroxycyclopentadienyl Ruthenium Hydrides as Benchmarks to Probe Ligand and Metal Effects on the Reactivity of Shvo Type Complexes.

Trimethylsilyl-Substituted Hydroxycyclopentadienyl Ruthenium Hydrides as Benchmarks to Probe Ligand and Metal Effects on the Reactivity of Shvo Type Complexes.
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DOI:
10.1021/om2007453
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发表时间:
2012
期刊:
影响因子:
2.8
通讯作者:
Guan H
Guan H
中科院分区:
化学2区
文献类型:
--
作者:
Casey CP;Guan H

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双(三甲基甲硅烷基)取代的羟基环戊二烯基氢化钌[2,5-(SiMe3)2-3,4-(CH2OCH2)(η5-C4COH)]Ru(CO)2H (10)是醛和酮氢化的有效催化剂。由于10将氢快速转移至醛和酮,并且在反应过程中不会形成不活泼的桥联氢化物,因此醛和酮的氢化可以在室温下在相对较低的氢气压力(3atm)下进行;与之前开发的 Shvo 型催化剂相比,这是一个显着的改进。对醛和酮化学计量还原 10 的动力学和 2H NMR 光谱研究建立了氢转移的两步过程:(1) 10 的 OH 与醛或酮的氧之间快速且可逆地形成氢键,(2) 随后质子和氢化物从 10 缓慢转移到醛或酮。将配合物 10 的化学计量活性和催化活性与其他 Shvo 型氢化钌和相关的氢化铁进行了比较。
The bis(trimethylsilyl)-substituted hydroxycyclopentadienyl ruthenium hydride [2,5-(SiMe3)2-3,4-(CH2OCH2)(η5-C4COH)]Ru(CO)2H (10) is an efficient catalyst for hydrogenation of aldehydes and ketones. Because 10 transfers hydrogen rapidly to aldehydes and ketones and because it does not form an inactive bridging hydride during reaction, hydrogenation of aldehydes and ketones can be performed at room temperature under relatively low hydrogen pressure (3 atm); this is a significant improvement compared with previously developed Shvo type catalysts. Kinetic and 2H NMR spectroscopic studies of the stoichiometric reduction of aldehydes and ketones by 10 established a two-step process for the hydrogen transfer: (1) rapid and reversible hydrogen bond formation between OH of 10 and the oxygen of the aldehyde or ketone, (2) followed by slow transfer of both proton and hydride from 10 to the aldehyde or ketone. The stoichiometric and catalytic activities of complex 10 are compared to those of other Shvo type ruthenium hydrides and related iron hydrides.
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