Constructing reactive Fe and Co complexes from isolated picolyl-functionalized N-heterocyclic carbenes
作者:Qiuming Liang、Nina Jiabao Liu、Datong Song
DOI:10.1039/c8dt02621a
日期:——
We report the isolation of free picolyl-functionalized N-heterocyclic carbenes (NHCs), which serve as versatile precursors to access low coordinate iron and cobalt complexes. The reactivities of these new iron and cobalt complexes towards catalytichydrosilylation of ketones have also been explored. For example, low loadings (0.05–1 mol%) of a four-coordinate ironcomplex bearing two deprotonated picolyl-NHC
(<i>N</i>-Phosphinoamidinate)Iron Pre-Catalysts for the Room Temperature Hydrosilylation of Carbonyl Compounds with Broad Substrate Scope at Low Loadings
作者:Adam J. Ruddy、Colin M. Kelly、Sarah M. Crawford、Craig A. Wheaton、Orson L. Sydora、Brooke L. Small、Mark Stradiotto、Laura Turculet
DOI:10.1021/om400883u
日期:2013.10.14
The synthesis and structural characterization of three-coordinate iron(II) and cobalt(II) complexes supported by new N-phosphinoamidinate ligands is reported, along with the successful application of these complexes as precatalysts for the challenging room-temperature hydrosilylation of carbonyl compounds to afford alcohols upon workup. Under the rigorous screening conditions employed (0.015 mol %
Hydrodeoxygenation Using Magnetic Induction: High‐Temperature Heterogeneous Catalysis in Solution
作者:Juan M. Asensio、Ana B. Miguel、Pier‐Francesco Fazzini、Piet W. N. M. van Leeuwen、Bruno Chaudret
DOI:10.1002/anie.201904366
日期:2019.8.12
an efficient way to perform catalytic reactions after deposition of the heating agent and the catalyst on a support. Here we show that in solution, and under mild conditions of mean temperature and pressure, it is possible to use magnetic heating to carry out transformations that are otherwise performed heterogeneously at high pressure and/or hightemperature. As a proof of concept, we chose the hydrodeoxygenation
最近已经证明了磁性加热是在将加热剂和催化剂沉积在载体上之后进行催化反应的有效方法。在这里,我们表明,在溶液中,在中等温度和平均压力的温和条件下,可以使用磁力加热进行转化,而这些转化在高压和/或高温下会不均匀地进行。作为概念的证明,我们选择了苯乙酮衍生物和生物质衍生的分子(即糠醛和羟甲基糠醛)进行加氢脱氧。这些反应是困难的,需要多相催化剂和高压,并且据我们所知,在标准溶液中尚无先例。在此,加氢脱氧在温和条件下(3 bar H 2,溶剂的平均温度适中)。该反应性的原因是将粒子快速加热到远高于溶剂的沸腾温度,并且局部形成了被蒸汽层包围的热点,其中可能存在高温和高压。对于许多有机转化而言,该技术可能是可行的。
(MeQn2SiH)Fe[N(SiMe3)2]2 (Qn = 8-quinolyl): an unusual δ-agostic iron complex containing an η1-SiH interaction
作者:Jian Yang、Meg Fasulo、T. Don Tilley
DOI:10.1039/c0nj00554a
日期:——
Reaction of MeQn2SiH (Qn = 8-quinolyl) (1) with Fe[N(SiMe3)2]2 at room temperature afforded (MeQn2SiH)Fe[N(SiMe3)2]2 (2), which is an unusual example of a δ-agostic iron complex containing an η1-H–Si interaction. Treatment of 2 with excess 3-pentanone at 60 °C produced MeQn2SiOCHEt2 (3) in ca. 80% yield.
Reversible Ligand-Centered Reduction in Low-Coordinate Iron Formazanate Complexes
作者:Daniël L. J. Broere、Brandon Q. Mercado、James T. Lukens、Avery C. Vilbert、Gourab Banerjee、Hannah M. C. Lant、Shin Hee Lee、Eckhard Bill、Stephen Sproules、Kyle M. Lancaster、Patrick L. Holland
DOI:10.1002/chem.201801298
日期:2018.7.2
Coordination of redox‐activeligands to metals is a compelling strategy for making reduced complexes more accessible. In this work, we explore the use of redox‐active formazanate ligands in low‐coordinate iron chemistry. Reduction of an iron(II) precursor occurs at milder potentials than analogous non‐redox‐active β‐diketiminate complexes, and the reduced three‐coordinate formazanate‐iron compound