从双价土金属转移到CO的化物转移的气相模型
Christian Sant Gjermestad1,2, Mauritz Johan Ryding2, Einar Uggerud2
1Department of Chemistry, University of Bergen, Allégaten 41, NO-5007 Bergen, Norway.
本研究探讨了涉及化合物和CO2/CH2O的化物转移反应. 对于二氧化碳消除,反应障碍较高,周期性趋势显示,较重的土金属的脱碳氧化能增加.
科学领域:
- 有机金属化学 有机金属化学
- 计算化学的计算化学
- 反应机制 反应机制
背景情况:
- 化合物在各种化学转化中起着至关重要的作用.
- 了解化物转移反应是催化和合成的关键.
- 电荷和连接体环境对反应性的影响往往是复杂的.
研究的目的:
- 研究化复合物 (HMg+,HMgCl,HMgCl2-) 在与CO2和CH2O的化转移反应中的活性.
- 阐明酸盐和甲基物种脱碳和变形反应的机制和能量.
- 为了探索土金属中反应性的周期性趋势.
主要方法:
- 结合了量子化学计算和质谱学实验.
- 分析单分子分解路径 (脱氧化和变形化).
- 研究连接物交换反应和反应性的周期性趋势.
主要成果:
- 研究了形式物种的脱碳氧化和 methoxy 物种的变形.
- 与CH2O消除相比,在CO2消除方面观察到更高的反应障碍.
- 对于CH3OMg+与CO2的配体交换是外热的,但对于中性和离子物种来说不那么有利.
- 土金属 (Be,Mg,Ca,Sr,Ba) 的反应性趋势显示,脱碳氧化能增加.
- 素替代 (F, Br, I) 对反应率的影响最小.
结论:
- 该研究为涉及复合物的化物转移反应的机制和能量学提供了洞察力.
- 系统的结构变化和周期性趋势显著影响反应性.
- 计算和实验数据提供了对这些重要的化学过程的全面了解.
更多相关视频
10:57Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
Published on: April 10, 2018
06:32A Simple, Low-cost, and Robust System to Measure the Volume of Hydrogen Evolved by Chemical Reactions with Aqueous Solutions
Published on: August 17, 2016
相关概念视频
Acid Halides to Alcohols: LiAlH4 Reduction
The mechanism proceeds in three steps. First, the nucleophilic hydride ion attacks the carbonyl carbon of the acid halide to form a tetrahedral intermediate. Next, the carbonyl group is re-formed, and the halide ion departs as a leaving group, generating an aldehyde. A second nucleophilic attack by the hydride yields an alkoxide ion, which, upon protonation, gives a primary alcohol as...
Hydroboration-Oxidation of Alkenes
Carboxylic Acids to Primary Alcohols: Hydride Reduction
Acid Halides to Alcohols: Grignard Reaction
Grignard reagents are a source of carbanions and function as nucleophiles. The mechanism begins with the nucleophilic attack by the carbanion at the carbonyl carbon of the acid halide to form a tetrahedral intermediate. Next, the carbonyl group is re-formed, and the halide ion departs,...
Alcohols from Carbonyl Compounds: Reduction
Catalytic hydrogenation is similar to the reduction of an alkene or alkyne by adding H2 across the pi bond in the presence of transition metal catalysts like Raney Ni, Pd–C, Pt, or Ru. Aldehydes and ketones can be reduced by this method, often under mild to moderate heat (25–100°C) and...
Aldehydes and Ketones to Alkanes: Wolff–Kishner Reduction
