相关实验视频
Updated: Jun 18, 2026
10:44
Isolating Free Carbenes, their Mixed Dimers and Organic Radicals
Published on: April 19, 2019
碳作为有机金属铁复合物的转化催化剂
Vincent Lavallo1, Robert H Grubbs
1Arnold and Mabel Beckman Laboratory of Chemical Synthesis, Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA 91125, USA.
Science (New York, N.Y.)
|November 11, 2009
概括
稳定的N-异环碳化合物 (NHCs) 介导 bis ((cyclooctatetraene) 铁的新型有机金属转化. 这些反应形成独特的铁复合体和集群,展示了NHCs.
科学领域:
- 有机金属化学 有机金属化学
- 催化剂是一种催化剂.
- 主群 化学 化学
背景情况:
- 催化剂的有限可用性,用于复杂的有机金属转化.
- N-异环碳 (NHCs) 是具有催化潜力的多功能有机物种.
- 铁 (Fe (COT) 2) 是一种反应性铁的前体.
研究的目的:
- 探索N-异环碳 (NHCs) 在有机金属反应中的催化潜力.
- 为了研究由NHCs介导的bis(cyclooctatetraene) 铁[Fe(COT) 2的反应性.
- 开发由有机物种催化的新型有机金属转化.
主要方法:
- 二氧化铁[Fe (COT) 2]与各种N-异环碳素 (NHC) 启动剂的反应.
- 固体测量反应来分离和表征新的铁物种.
- 催化反应形成铁集群.
主要成果:
- 通过静态度反应分离了一种具有Fe(0) 和Fe(I) 中心的新型混合价值铁物种.
- 通过催化反应形成一个三铁集群,Fe3(COT) 3,一种Fe3(CO) 12的碳化合物模拟物.
- 作为一个关键的机械步骤,NHC诱导的金属金属键形成的证据.
结论:
- 稳定的N-异环碳化合物 (NHCs) 可以在室温下调解不寻常的有机金属转化.
- 通过NHC介导的反应为合成独特的铁复合物和集群提供了新的途径.
- 这些发现为开发未来由有机分子催化的有机金属转化奠定了基础.
更多相关视频
相关概念视频
01:23Properties of Organometallic Compounds
Organometallic compounds are compounds that contain a carbon–metal bond. Carbon belongs to an organyl group like alkyl, aryl, allyl, or benzyl groups. The metal can be from Group I or Group II of the periodic table, a transition metal, or a semimetal.
02:17Reduction of Alkenes: Asymmetric Catalytic Hydrogenation
Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
02:24Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation
Introduction
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
02:51Metal-Ligand Bonds
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
01:22Heterogeneous Catalysis
Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...
01:18Benzene to 1,4-Cyclohexadiene: Birch Reduction Mechanism
Birch reduction uses solvated electrons as reducing agents. The reaction converts benzene to 1,4-cyclohexadiene. The reaction proceeds by the transfer of a single electron to the ring to form a benzene radical anion. This anion is highly basic—it abstracts a proton from the alcohol to form a cyclohexadienyl radical. Another single electron transfer gives the cyclohexadienyl anion. A proton transfer from the alcohol forms 1,4-cyclohexadiene. Since this reduction occurs via radical anion...