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相关概念视频

Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate02:21

Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate

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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.
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Oxidation of Alcohols02:37

Oxidation of Alcohols

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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:
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Reactions of Aldehydes and Ketones: Baeyer–Villiger Oxidation01:22

Reactions of Aldehydes and Ketones: Baeyer–Villiger Oxidation

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Baeyer–Villiger oxidation converts aldehydes to carboxylic acids and ketones to esters. The reaction uses peroxy acids or peracids and is often catalyzed by acid. The reaction is named after its pioneers, Adolf von Baeyer and Victor Villiger. The reaction is achieved by a wide range of peracids such as m-chloroperoxybenzoic acid (mCPBA), perbenzoic acid (C6H5COOOH), peracetic acid (CH3COOOH), hydrogen peroxide (H2O2), and tert-butyl hydroperoxide (t-BuOOH).
The carbonyl center is...
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Sharpless Epoxidation02:57

Sharpless Epoxidation

4.2K
The conversion of allylic alcohols into epoxides using the chiral catalyst was discovered by K. Barry Sharpless and is known as Sharpless epoxidation. The use of a chiral catalyst enables the formation of one enantiomer of the product in excess. This chiral catalyst is mainly a chiral complex of titanium tetraisopropoxide and tartrate ester (specific stereoisomer). The stereoisomer used in the chiral catalyst dictates the formation of the enantiomer of the product. In other words, the use of...
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Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide02:44

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

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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.
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Pyruvate Oxidation01:15

Pyruvate Oxidation

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After glycolysis, the charged pyruvate molecules enter the mitochondria via active transport and undergo three enzymatic reactions. These reactions ensure that pyruvate can enter the next metabolic pathway so that energy stored in the pyruvate molecules can be harnessed by the cells.
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相关实验视频

Updated: Sep 10, 2025

Synthesis and Catalytic Performance of Gold Intercalated in the Walls of Mesoporous Silica
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在性介质中电氧化甘油的PtPd碳基催化剂

Juan Manuel Sieben1, Andrea E Alvarez2, Myriam Torres García3

  • 1Departamento de Química and INQUISUR-CONICET, Universidad Nacional del Sur, Av. Leandro N. Alem 1.253, B8000CPB, Bahía Blanca, Argentina.

ChemPlusChem
|August 23, 2025
PubMed
概括

皮衍生生物碳支持- (PtPd) 纳米粒子增强糖醇电氧化. 这些新型催化剂的活性和稳定性优于商业碳支持剂.

关键词:
Pt0.75Pd0.25纳米粒子生物碳快速热解糖电氧化微波辅助的乙烯基醇降解方法

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科学领域:

  • 电化学
  • 材料科学
  • 催化剂

背景情况:

  • 糖氧化对于能量转化和化学合成至关重要.
  • 开发高效的电催化剂是改善甘油氧化过程的关键.
  • 可持续且具有成本效益的催化剂支持具有很高的需求.

研究的目的:

  • 研究皮衍生生物碳作为PtPd纳米粒子的支材料.
  • 评估 PtPd/生物碳催化剂在性介质中的氧化糖的电催化性能.
  • 了解PtPd纳米粒子和生物碳支物的协同效应.

主要方法:

  • 在300°C (BCM-300) 和500°C (BCM-500) 的温度下使用快速热解来合成皮中的生物碳.
  • 使用脉冲微波辅助聚合物方法将PtPd纳米颗粒 (3:1 Pt:Pd比率) 沉积在生物碳上.
  • 使用电化学技术来评估糖醇氧化反应活性,开始潜力,激活能量和电荷转移电阻.

主要成果:

  • 支持生物碳的PtPd纳米颗粒显示出高于火山碳黑的糖醇氧化质量特异性活性.
  • PtPd/生物碳催化剂呈现较低的潜力发作,明显的激活能量降低,电荷转移阻力降低.
  • 在300°C和500°C时合成的生物碳显示出良好的电子导电性和适用于催化剂支的表面特性.

结论:

  • 在糖醇电氧化中,皮衍生的生物碳是PtPd纳米颗粒的有效支物.
  • 增强的性能归因于PtPd和生物碳支持之间的协同效应,涉及电子和双功能机制.
  • 这些发现突显了利用废物生物质开发先进电催化材料的潜力.