相关实验视频
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A Toolkit to Enable Hydrocarbon Conversion in Aqueous Environments
Published on: October 2, 2012
在酶性酒精氧化中对"道化和合运动"概念进行了关键测试
1Department of Chemistry, University of Iowa , Iowa City, Iowa 52242, United States.
Journal of the American Chemical Society
|September 12, 2013
概括
使用动态同位素效应 (KIEs) 研究了酶C-H键激活. 结果支持Marcus-like模型,表明气道在C-H转移期间影响了酶结构.
科学领域:
- 生物化学 生物化学
- 酶学 是一种酶学.
- 物理化学 物理化学
背景情况:
- 酶性C-H键激活在生物系统中至关重要.
- 两个模型解释了C-H激活:量子道与合的气运动与马库斯样电子转移.
- 之前在酒精脱酶上进行的动态同位素效应 (KIE) 研究表明道化.
研究的目的:
- 为了区分由酶激活C-H键的竞争模型.
- 为了研究量子力学道化在酒精脱酶中的作用.
- 阐明在酶反应中转移的物理机制.
主要方法:
- 测量二次 (2°) H/T动态同位素效应 (KIE).
- 使用的 (D) 在主要 (1°) 位置与 (H) 一起使用.
- 在酒精脱酶的背景下分析KIE数据.
主要成果:
- 在转移时,2°KIE显著降低,与相比.
- 这一观察与马库斯式转移模型的预测一致.
- 与D-转移的2°KIE减压表示D-转移的捐赠者-接受者距离比H-转移更短.
结论:
- 酶催化C-H键的激活可能涉及马库斯类型的转移.
- 量子力学道动力学会影响过渡状态中的酶结构.
- 这些发现为控制酶C-H激活的物理机制提供了新的见解.
相关概念视频
Oxidation of Alcohols
In this lesson, the oxidation of alcohols is discussed in depth. The various reagents used for oxidation of primary and secondary alcohols are detailed, and their mechanism of action is provided.
The process of oxidation in a chemical reaction is observed in any of the three forms:
The process of oxidation in a chemical reaction is observed in any of the three forms:
Oxidations of Aldehydes and Ketones to Carboxylic Acids
Oxidation of aldehydes and ketones results in the formation of carboxylic acids. Aldehydes, bearing hydrogen next to the carbonyl group, are easily oxidized compared to ketones. This is because an aldehydic proton can easily be abstracted during oxidation.
Aldehydes readily undergo oxidation in strong oxidizing agents such as potassium permanganate and chromic acid. The oxidation can also be carried out using mild oxidizing agents such as silver oxide. In fact, aldehydes can be easily oxidized...
Aldehydes readily undergo oxidation in strong oxidizing agents such as potassium permanganate and chromic acid. The oxidation can also be carried out using mild oxidizing agents such as silver oxide. In fact, aldehydes can be easily oxidized...
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 of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide
Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate
Alkenes can be dihydroxylated using potassium permanganate. The method encompasses the reaction of an alkene with a cold, dilute solution of potassium permanganate under basic conditions to form a cis-diol along with a brown precipitate of manganese dioxide.
Hydroboration-Oxidation of Alkenes
In addition to the oxymercuration–demercuration method, which converts the alkenes to alcohols with Markovnikov orientation, a complementary hydroboration-oxidation method yields the anti-Markovnikov product. The hydroboration reaction, discovered in 1959 by H.C. Brown, involves the addition of a B–H bond of borane to an alkene giving an organoborane intermediate. The oxidation of this intermediate with basic hydrogen peroxide forms an alcohol.

