一个高效的催化剂选择性氧化裂变的烯酸到化物:异常-NHC-Ru(II) 复合物在氧化化学
Prosenjit Daw1, Ramu Petakamsetty, Abir Sarbajna
1Department of Chemistry and Center for Environmental Science and Engineering, Indian Institute of Technology Kanpur , Kanpur 208016, India.
Journal of the American Chemical Society
|September 20, 2014
概括
这项研究引入了一种用于选择性氧化反应的新型催化剂. 催化剂有效地将碳-碳双和三键转化为有价值的化物和α-二基,分别使用各种基质.
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.
- 有机合成 有机合成
背景情况:
- 开发高效和选择性的催化剂对于现代有机合成至关重要.
- N-异环碳 (NHC) 连接物在催化应用中稳定过渡金属方面显示出很大的前景.
- 不和碳-碳键的选择性氧化仍然是合成化学的一个重大挑战.
研究的目的:
- 为了证明一种新型的催化剂的实用性和选择性,[Ru(COD) ((L(1)) Br2] (1).
- 探索催化剂在选择性氧化和的能力.
- 用各种功能化基板来评估催化剂的性能.
主要方法:
- 合成和表征催化剂的合成和表征,其中包括一种基于纳菲里丁的异常N- heterocyclic carbene 合体 (L(1) 的imidazo[1,2-a][1,8] .
- 催化氧化反应是在室温的混合溶剂系统 (EtOAc/CH3CN/H2O) 中进行的.
- 基质范围评估包括各种功能化化合物,如糖和氨基酸衍生物.
主要成果:
- 催化剂[Ru(COD) ((L(1)) Br2] (1) 对CC键与化物的氧化具有很高的选择性.
- 催化剂有效氧化了CC键到α-二基.
- 证明了对高度功能化的基质,包括糖和氨基酸衍生物的成功应用.
结论:
- 这种新型的催化剂具有异常的N-异环碳联体,在选择性氧化反应中非常有效.
- 催化剂提供了一种多功能和高效的方法,在温和条件下合成化物和α-二基.
- 这种催化系统有可能用于复杂有机分子的合成.
更多相关视频
19:58Palladium N-Heterocyclic Carbene Complexes: Synthesis from Benzimidazolium Salts and Catalytic Activity in Carbon-carbon Bond-forming Reactions
Published on: July 30, 2017
9.3K
10:52Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
Published on: July 27, 2022
2.8K
相关概念视频
02:57Coordination Number and Geometry
15.5K
For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.
15.5K
03:02Colors and Magnetism
12.0K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
12.0K
02:54Coordination Compounds and Nomenclature
21.0K
In most main group element compounds, the valence electrons of the isolated atoms combine to form chemical bonds that satisfy the octet rule. For instance, the four valence electrons of carbon overlap with electrons from four hydrogen atoms to form CH4. The one valence electron leaves sodium and adds to the seven valence electrons of chlorine to form the ionic formula unit NaCl (Figure 1a). Transition metals do not normally bond in this fashion. They primarily form coordinate covalent bonds, a...
21.0K
02:34Structural Isomerism
16.8K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly,...
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly,...
16.8K
02:42Valence Bond Theory
8.8K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
8.8K
01:43Electron Transport Chain: Complex III and IV
6.7K
During the electron transport chain, electrons from NADH and FADH2 are first transferred to complexes I and II, respectively. These two complexes then transfer the electrons to ubiquinol, which carries them further to complex III. Complex III passes the electrons across the intermembrane space to Cyt c, which carries them further to complex IV. Complex IV donates electrons to oxygen and reduces it to water. As electrons pass through complexes I, III, and IV, the energy released aids the pumping...
6.7K