Thermoregulated phase-transfer iridium nanoparticle catalyst: highly selective hydrogenation of the CO bond for α,β-unsaturated aldehydes and the CC bond for α,β-unsaturated ketones
作者:Wenjiang Li、Yanhua Wang、Pu Chen、Min Zeng、Jingyang Jiang、Zilin Jin
DOI:10.1039/c6cy01137c
日期:——
thermoregulated ligand Ph2P(CH2CH2O)22CH3-stabilized iridium nanoparticles exhibited a totally different orientation for the hydrogenation of unsaturated carbonyl compounds, namely, highly selective hydrogenation of the CO bond for α,β-unsaturated aldehydes and the CC bond for α,β-unsaturatedketones.
Synthesis of silyl iron hydride <i>via</i> Si–H activation and its dual catalytic application in the hydrosilylation of carbonyl compounds and dehydration of benzamides
The hydrido silyl iron complex (o-Ph2PC6H4SiMe2)Fe(PMe3)3H (2) was obtained via the activation of the Si–H bond of the bidentate silyl ligand o-Ph2P(C6H4)SiMe2H (1) by Fe(PMe3)4. 2 showed good to excellent catalytic activity in both the reduction of aldehydes/ketones and the dehydration of benzamide. In addition, with complex 2 as a catalyst, α,β-unsaturated carbonyls could be selectively reduced to
氢化硅烷基铁络合物(o -Ph 2 PC 6 H 4 SiMe 2)Fe(PMe 3)3 H(2)是通过激活双齿甲硅烷基配体o -Ph 2 P(C)的Si–H键而获得的Fe(PMe 3)4形成6 H 4)SiMe 2 H(1)。图2在醛/酮的还原和苯甲酰胺的脱水中均显示出良好至优异的催化活性。另外,带复数2作为催化剂,α,β-不饱和羰基可以选择性地还原为相应的α,β-不饱和醇。提出了2的形成机理和催化脱水过程,并进行了部分实验验证。
Pyridine <i>N</i>-oxide promoted hydrosilylation of carbonyl compounds catalyzed by [PSiP]-pincer iron hydrides
(5)], were used as catalysts to study the effects of pyridine N-oxide and the electronic properties of [PSiP]-ligands on the catalytic hydrosilylation of carbonyl compounds. It was proved for the first time that this catalytic process could be promoted with pyridine N-oxide as the initiator at 30 °C because the addition of pyridine N-oxide is beneficial for the formation of an unsaturated hydrido iron
五个[PSiP]钳制铁氢化物1-5,[(2-Ph 2 PC 6 H 4)2 HSiFe(H)(PMe 3)2(1),(2-Ph 2 PC 6 H 4)2 MeSiFe( H)(PMe 3)2(2),(2-Ph 2 PC 6 H 4)2 PhSiFe(H)(PMe 3)2(3),(2-(iPr)2 PC 6 H 4)2 HSiFe(高)(PMe3)( 4)和(2-(iPr) 2 PC 6 H 4) 2 MeSiFe(H)(PMe 3) 2( 5)]用作催化剂,研究吡啶-N-氧化物和电子[PSiP]-配体对羰基化合物催化氢化硅烷化反应的影响 首次证明在30°C下以吡啶N-氧化物为引发剂可以促进该催化过程,因为添加吡啶N-氧化物有利于形成不饱和氢化铁络合物,这是关键催化机制中的中间体。复杂4作为最好的催化剂表现出优异的催化性能。在五个复合物,复合物3是新的,复杂的分子结构3通过单晶X射线衍射来确定。讨论了一种建议的机制。
Transfer Hydrogenation of Aldehydes and Ketones with Isopropanol under Neutral Conditions Catalyzed by a Metal–Ligand Bifunctional Catalyst [Cp*Ir(2,2′-bpyO)(H<sub>2</sub>O)]
作者:Rongzhou Wang、Yawen Tang、Meng Xu、Chong Meng、Feng Li
DOI:10.1021/acs.joc.7b03174
日期:2018.2.16
A Cp*Ir complex bearing a functional bipyridonate ligand [Cp*Ir(2,2′-bpyO)(H2O)] was found to be a highly efficient and general catalyst for transfer hydrogenation of aldehydes and chemoselective transfer hydrogenation of unsaturated aldehydes with isopropanol under neutral conditions. It was noteworthy that many readily reducible or labile functional groups such as nitro, cyano, ester, and halide
Ambient-pressure highly active hydrogenation of ketones and aldehydes catalyzed by a metal-ligand bifunctional iridium catalyst under base-free conditions in water
high active catalytic system for the hydrogenation of ketones and aldehydes to produce corresponding alcohols under atmospheric-pressure H2 gas and ambient temperature conditions was developed by a water-soluble metal–ligand bifunctional catalyst [Cp*Ir(2,2′-bpyO)(OH)][Na] in water without addition of a base. The catalyst exhibited high activity for the hydrogenation of ketones and aldehydes. Furthermore