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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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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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Preparation of Epoxides03:00

Preparation of Epoxides

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Overview
Epoxides result from alkene oxidation, which can be achieved by a) air, b) peroxy acids, c) hypochlorous acids, and d) halohydrin cyclization.
Epoxidation with Peroxy Acids
Epoxidation of alkenes via oxidation with peroxy acids involves the conversion of a carbon–carbon double bond to an epoxide using the oxidizing agent meta-chloroperoxybenzoic acid, commonly known as MCPBA. Since the O–O bond of peroxy acids is very weak, the addition of electrophilic oxygen of...
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Updated: May 27, 2025

Simple Methods for the Preparation of Non-noble Metal Bulk-electrodes for Electrocatalytic Applications
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Simple Methods for the Preparation of Non-noble Metal Bulk-electrodes for Electrocatalytic Applications

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高的分层双氧化物用于高效的甲醇电氧化.

Yuying Wang1, Yihang Hu1, Zhaohui Wu1

  • 1State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, P. R. China.

Small (Weinheim an der Bergstrasse, Germany)
|February 16, 2025
PubMed
概括
此摘要是机器生成的。

高层的双氧化物显示出通过电催化甲醇氧化有效生产的前景. 添加剂的催化剂表现出卓越的性能和稳定性,克服了传统基材料的局限性.

关键词:
具有高的高.格子应变应变 格子应变有层的双氧化.甲醇氧化过程中的甲醇氧化

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科学领域:

  • 材料科学 材料科学 材料科学
  • 电化学 电化学 电化学
  • 催化剂是一种催化剂.

背景情况:

  • 电催化甲醇氧化 (MOR) 是生产的关键过程,为氧化演化反应 (OER) 提供了替代方案.
  • 基于的催化剂面临着由于动力学缓慢和难以破解C-H键的挑战,这阻碍了它们的广泛应用.

研究的目的:

  • 合成和评估用于电催化甲醇氧化的新型高层双氧化物 (HELHs).
  • 调查HELH的性能和稳定性,特别关注化变体.

主要方法:

  • 三种HELHs的合成:ZnNiFeCoV-HELH,ZnNiFeCoCr-HELH,以及ZnNiFeCoAl-HELH. 这三种HELH的合成.
  • 电催化性能测试,包括100 mA cm-2的潜在测量和多个周期的稳定性评估.
  • 实验和理论研究以了解反应动力学,活性物种,甲醇吸附和能量障碍.

主要成果:

  • 与Cr-HELH (1.41 V) 和Al-HELH (1.44 V) 相比,V-HELH显示出最低的电位 (1.39 V 在100 mA cm-2).
  • 在5个循环后,V-HELH保持了超过95%的成型产量,表明了出色的稳定性.
  • V-HELH表现出最快的反应动力学,更高的活性Ni3+物种度,以及更强的甲醇吸附 (-3.31 eV).
  • 理论计算显示,引入优化了d波段中心 (-0.54 eV) 并降低了C-H键裂变 (-1.62 eV) 的能量屏障.

结论:

  • 高层双氧化物,特别是V-HELH,是甲醇氧化的高效电催化剂.
  • 在优化电子结构和降低激活能量障碍方面的作用对于增强的催化活性和稳定性至关重要.
  • 这项研究为设计用于高效生产的先进电催化剂提供了宝贵的见解.