氧化和碳-碳键形成的可逆结合在一个半氧化中
Sankar Prasad Rath1, Richard Koerner, Marilyn M Olmstead
1Department of Chemistry, University of California, Davis, One Shields Avenue, Davis, California 95616, USA.
Journal of the American Chemical Society
|September 25, 2003
概括
氧化与铁八甲基化的化溶液结合,导致可逆的颜色变化和二元化. 这种反应形成了一个新的C-C键,为血红素降解途径提供了洞察力.
科学领域:
- 生物有机化学 生物有机化学
- 协调化学 协调化学
- 有机化学 有机化学
背景情况:
- 铁和相关的宏循环在生物系统中至关重要.
- 了解连接体结合和反应性是阐明金属酶机制的关键.
- 八甲基化 (OEPO) 是一种具有独特电子和硬质性质的合成宏环联体.
研究的目的:
- 在无氧条件下研究 (py) 2Fe (OEPO) 与氧化 (NO) 的反应.
- 描述所产生的NO adduct,并了解其结构和电子特征.
- 探索观察到的结构对血红素降解机制的影响.
主要方法:
- 对反应进行光谱监测 (UV-Vis,1H NMR)
- 产品的X射线晶体学分离和表征.
- 分析连接体扭曲和反应部位的近距离.
主要成果:
- 对NO的暴露导致颜色从绿色变为红棕色,并形成{(py) ((ON) Fe (OEPO) }2.
- 通过1HNMR光谱学发现反应是可逆的.
- X射线晶体学揭示了通过中碳之间C-C键的二元化,NO联结体位于宏循环的氧化中碳位置附近.
结论:
- NO结合会诱导铁八甲基醇复合物的二元化和结构变化.
- 观察到的结构为涉及氧气攻击的血降解的初始阶段提供了一个模型.
- 卷曲的宏循环和NO与氧化中碳的接近是理解血红素反应性的关键特征.
相关概念视频
Redox Reactions
Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...
Covalent Bonding and Lewis Structures
Compared to ionic bonds, which results from the transfer of electrons between metallic and nonmetallic atoms, covalent bonds result from the mutual attraction of atoms for a “shared” pair of electrons.
Lewis Structures of Molecular Compounds and Polyatomic Ions
To draw Lewis structures for complicated molecules and molecular ions, it is helpful to follow a step-by-step procedure as outlined:
Oxidative Cleavage of Alkenes: Ozonolysis
In ozonolysis, ozone is used to cleave a carbon–carbon double bond to form aldehydes and ketones, or carboxylic acids, depending on the work-up.
Ozone is a symmetrical bent molecule stabilized by a resonance structure.
Ozone is a symmetrical bent molecule stabilized by a resonance structure.
Oxidation and Reduction of Organic Molecules
Energy production within a cell involves many coordinated chemical pathways. Most of these pathways are combinations of oxidation and reduction reactions, which occur at the same time. An oxidation reaction strips an electron from an atom in a compound, and the addition of this electron to another compound is a reduction reaction. Because oxidation and reduction usually occur together, these pairs of reactions are called redox reactions.
The removal of an electron from a molecule, results in a...
The removal of an electron from a molecule, results in a...
Redox Reactions
Redox reactions are vital biochemical processes that underpin energy metabolism in cells. These reactions involve the transfer of electrons between molecules, occurring in tandem as oxidation and reduction. Oxidation refers to the loss of electrons, while reduction denotes their gain. This coupling ensures the seamless flow of electrons through metabolic pathways. For example, in bacterial metabolism, glucose undergoes oxidation to carbon dioxide, while oxygen is simultaneously reduced to...


