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相关概念视频

Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids02:04

Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids

5.7K
Diols are compounds with two hydroxyl groups. In addition to syn dihydroxylation, diols can also be synthesized through the process of anti dihydroxylation. The process involves treating an alkene with a peroxycarboxylic acid to form an epoxide. Epoxides are highly strained three-membered rings with oxygen and two carbons occupying the corners of an equilateral triangle. This step is followed by ring-opening of the epoxide in the presence of an aqueous acid to give a trans diol.
5.7K
Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide02:44

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

10.0K
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.
10.0K
Oxidative Cleavage of Alkenes: Ozonolysis01:46

Oxidative Cleavage of Alkenes: Ozonolysis

10.1K
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.
10.1K
Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate02:21

Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate

11.1K
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.
11.1K
Hydroboration-Oxidation of Alkenes03:08

Hydroboration-Oxidation of Alkenes

8.0K
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.
8.0K
Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

3.3K
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...
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Benchtop Immobilized Metal Affinity Chromatography, Reconstitution and Assay of a Polyhistidine Tagged Metalloenzyme for the Undergraduate Laboratory
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二氧化原酶的结构和功能模型.

Atanu Banerjee1, Allison E Creek2, Aramice Y S Malkhasian2

  • 1Dr. K. C. Patel R & D Centre, Charotar University of Science and Technology (CHARUSAT), 388421 Anand, Gujarat, India.

Journal of inorganic biochemistry
|September 7, 2024
PubMed
概括

研究人员使用重的伊米达联体开发了新的铁复合物. 这些复合体,特别是具有四面体几何学的复合体,显示出作为胡卜素裂变氧化酶和催化烯酸裂变反应的模型的希望.

关键词:
C=C的激活方式裂纹反应 裂纹反应在 DFT 方面,它是最重要的.铁铁铁是什么意思 铁铁铁频谱学是一种光谱学.在X射线中,X射线的 difraktion 分散.

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科学领域:

  • 协调化学 协调化学
  • 生物有机化学 生物有机化学
  • 有机金属化学 有机金属化学

背景情况:

  • 铁复合物与伊米达连接物在生物系统中至关重要,特别是在诸如胡卜素分裂二氧化酶 (CCD) 等酶中.
  • 设计模仿这些酶活性位点的合成铁位点对于理解它们的机制和开发新的催化剂至关重要.

研究的目的:

  • 通过使用非化性大容量伊米达联体,合成和表征新型无菌控制的铁复合物.
  • 研究这些铁复合物的结构,电子和催化性能.
  • 探索它们作为CCD酶的结构和功能模型的潜力.

主要方法:

  • 五坐标 ([Fe(1,2-Me2Im) 5) 和四坐标 ([Fe(2-iPr-1-MeIm) 4) 铁复合物的合成.
  • 使用X射线晶体学和几何参数 (τ5, τ'4) 的结构特征.
  • 通过Mössbauer光谱学确定电子结构.
  • 在氧气的存在下,用模型基质对烯裂变反应进行催化研究.
  • 由密度函数理论 (DFT) 计算支持的机械洞察力.

主要成果:

  • 合成了第一个具有扭曲方形金字塔几何形状的五坐标伊米达-铁复合体的例子.
  • 获得了一个具有扭曲四面体几何学的四坐标铁复合体,作为CCD的4-His铁结构模型.
  • 这两种复合物都催化了烯酸裂变反应,四坐标复合物显示出更高的产品产量.
  • DFT计算为拟议的反应机制提供了支持.

结论:

  • 通过使用体控制的铁位点可以有效地产生体积大,非化性意米达连接物.
  • 合成的铁复合物作为了解CCD酶机制的有价值模型.
  • 这些复合物在烯酸裂变中表现出催化活性,突出显示了它们作为合成催化剂的潜力.