通过可见光进行工程光氧化还原触发的化学转化已成为有机合成领域的新兴领域。但是,大多数成熟的光催化剂都是基于与贵金属和有机配体有关的过渡金属络合物或光敏有机染料,大大阻碍了可以提供更好的稳定性和耐久性的纯无机分子光催化剂的开发。在这里,我们发现安德森多金属氧酸盐(POM)Na 4 [NiMo 6 O 18(OH)6 ](1)由纯的无机骨架组成,该骨架由中心的Ni II核构建而成,并由六个Mo VI O 6支撑。无机支架/配体,可用作强大的光催化剂。在可见光(> 400 nm)照射下,该化合物可以高效催化多种反应,包括氯化物与胺的氧化交叉偶联反应,以及使用分子氧的氯化物氧化,从而提供多种亚胺,醛和酮,分别具有高选择性和高收率。由于具有强大的无机骨架,该催化剂在催化过程中表现出出色的稳定性和可重复使用性,而催化活性几乎没有损失,因此提供了一种无需使用复杂的有机配体和昂贵的贵金属基光敏剂的替代方案。
A generalstudy of the regioselective hydroamination of terminalalkynes in the presence of Ti(NEt 2 ) 4 and different aryloxo and alkoxoligands is presented. Depending on the ligand the regioselectivity towards the Markovnikov and the and-Markovnikov addition product can be controlled. The experimentally observed isomer distribution is explained perfectly by detailed theoretical investigations which
Cobalt-Catalyzed Acceptorless Alcohol Dehydrogenation: Synthesis of Imines from Alcohols and Amines
作者:Guoqi Zhang、Susan K. Hanson
DOI:10.1021/ol303479f
日期:2013.2.1
A cobalt catalyst has been developed for the acceptorlessdehydrogenation of alcohols and applied to synthesize imines from alcohols and amines. Deuterium labeling studies suggest that the reaction proceeds by an initial reversible alcoholdehydrogenation step involving a cobalt hydride intermediate.
Controlling selectivity: from Markovnikov to anti-Markovnikov hydroamination of alkynes
作者:Annegret Tillack、Vivek Khedkar、Matthias Beller
DOI:10.1016/j.tetlet.2004.09.168
日期:2004.11
Depending on the catalyst a remarkable control of regioselectivity is achieved for the titanium-catalyzed intermolecular hydroamination of various alkynes. Proper choice of sterically hindered phenol ligands such as 1 and 4 enables a selectivity switch from the Markovnikov to the anti-Markovnikov products from M:anti-M = > 90:10 to > 10:90. (C) 2004 Elsevier Ltd. All rights reserved.
Visible‐Light‐Driven Photocatalytic Oxidation of Organic Chlorides Using Air and an Inorganic‐Ligand Supported Nickel‐Catalyst Without Photosensitizers
Engineering photoredox‐triggered chemical transformation via visible light has been an emerging area in organic synthesis. However, most of the well‐established photocatalysts are based upon either transition metal complexes involved with noble metals and organic ligands or photosensitive organic dyes, the development of pure inorganic molecular photocatalysts that could provide better stability and
通过可见光进行工程光氧化还原触发的化学转化已成为有机合成领域的新兴领域。但是,大多数成熟的光催化剂都是基于与贵金属和有机配体有关的过渡金属络合物或光敏有机染料,大大阻碍了可以提供更好的稳定性和耐久性的纯无机分子光催化剂的开发。在这里,我们发现安德森多金属氧酸盐(POM)Na 4 [NiMo 6 O 18(OH)6 ](1)由纯的无机骨架组成,该骨架由中心的Ni II核构建而成,并由六个Mo VI O 6支撑。无机支架/配体,可用作强大的光催化剂。在可见光(> 400 nm)照射下,该化合物可以高效催化多种反应,包括氯化物与胺的氧化交叉偶联反应,以及使用分子氧的氯化物氧化,从而提供多种亚胺,醛和酮,分别具有高选择性和高收率。由于具有强大的无机骨架,该催化剂在催化过程中表现出出色的稳定性和可重复使用性,而催化活性几乎没有损失,因此提供了一种无需使用复杂的有机配体和昂贵的贵金属基光敏剂的替代方案。