替代物对分子活性在二氧化氧化时的替代物的作用:密度功能理论研究
Baojie Liu1, Lu Liu1, Xin Qin1
1Guangxi Key Laboratory of Clean Pulp & Papermaking and Pollution Control, School of Light Industrial and Food Engineering, Guangxi University, Nanning 530004, China.
International journal of molecular sciences
|July 29, 2023
概括
了解红素的理解 红素的理解
科学领域:
- 生物质转换生物质转换
- 聚合物化学 聚合物化学
- 计算化学的计算化学
背景情况:
- 氨酸是基纤维素生物质中的复杂聚合物,由于其多样化的替代物和链接,在氧化过程中表现出不同的反应性.
- 环替代物的影响,特别是它们与甲氧基相对的位置,在氧化反应中显著影响着素的反应性.
- 研究这些替代剂对氧化机制的确切影响仍然是一个不完整但至关重要的研究领域.
研究的目的:
- 系统地研究环替代剂和甲氧基团对二氧化物氧化林的机制的影响.
- 阐明红素模型结构的变化如何影响对二氧化的反应性.
- 为了更深入地了解红素对氧化降解的易感性.
主要方法:
- 运用密度函数理论 (DFT) 与计算分析的 m062x/6-311+g (d) 基础集.
- 检查了六种不同的性素模型物种,具有不同的替代物模式.
- 比较了键能,静电电位,原子电荷,福井函数,双描述器和反应能量障碍.
主要成果:
- 较短的分支链和强大的吸收电子的替代物增强了素模型的稳定性,减少了对二氧化的敏感性.
- 较长的分支链显著影响电子云分布,影响分子反应.
- 甲基组降低了基基组的解离能量,增加了对电友性攻击的易感性,并稳定了素结构.
结论:
- 环替代剂和甲氧基团批判性地调节了二氧化物的氧化机制.
- 宁的反应性直接与其替代剂所施加的电子效应和硬质障碍有关.
- 这些发现为控制生物质转化应用中素的氧化行为提供了洞察力.
相关概念视频
02:37Oxidation of Alcohols
13.3K
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:
13.3K
01:31Radical Substitution: Allylic Chlorination
2.3K
Typically, when alkenes react with halogens at low temperatures, an addition reaction occurs. However, upon increasing the temperature or under reaction conditions that form radicals, providing a low but steady concentration of halogen radicals, allylic substitution reaction is favored. This is because allylic hydrogens are very reactive as the formed intermediate is resonance stabilized. For example, when propene is treated with chlorine in the gas phase at 400 °C, it undergoes allylic...
2.3K
01:11ortho–para-Directing Activators: –CH3, –OH, –NH2, –OCH3
6.1K
All ortho–para directors, excluding halogens, are activating groups. These groups donate electrons to the ring, making the ring carbons electron-rich. Consequently, the reactivity of the aromatic ring towards electrophilic substitution increases. For instance, the nitration of anisole is about 10,000 times faster than the nitration of benzene. The electron-donating effect of the methoxy group in anisole activates the ortho and para positions on the ring and stabilizes the corresponding...
6.1K
02:14SN2 Reaction: Kinetics
8.6K
Kinetic Studies and Significance
In a chemical reaction, a relationship exists between the concentration of reactants and the rate at which the reaction proceeds. The study to measure this relationship is known as the kinetics of a chemical reaction. Kinetic studies are used to deduce the rate law of a chemical reaction, which provides information about the species involved during the transition state of the rate-determining step. Thus, kinetic studies help to derive the mechanism of a...
In a chemical reaction, a relationship exists between the concentration of reactants and the rate at which the reaction proceeds. The study to measure this relationship is known as the kinetics of a chemical reaction. Kinetic studies are used to deduce the rate law of a chemical reaction, which provides information about the species involved during the transition state of the rate-determining step. Thus, kinetic studies help to derive the mechanism of a...
8.6K
01:15Electrophilic Aromatic Substitution: Chlorination and Bromination of Benzene
8.2K
Chlorination and bromination are important classes of electrophilic aromatic substitutions, where benzene reacts with chlorine or bromine in the presence of a Lewis acid catalyst to give halogenated substitution products. A Lewis acid such as aluminium chloride or ferric chloride catalyzes the chlorination, and ferric bromide catalyzes the bromination reactions. During the bromination of alkenes, bromine polarizes and becomes electrophilic. However, in the bromination of benzene, the bromine...
8.2K
02:34Nucleophilic Substitution Reactions
16.6K
Historical perspective
In 1896, the German chemist Paul Walden discovered that he could interconvert pure enantiomeric (+) and (-) malic acids through a series of reactions. This conversion suggested the involvement of optical inversion during the substitution reaction. Further, in 1930, Sir Christopher Ingold described for the first time two different forms of nucleophilic substitution reactions, which are known as SN1 (nucleophilic substitution unimolecular) and SN2 (nucleophilic substitution...
In 1896, the German chemist Paul Walden discovered that he could interconvert pure enantiomeric (+) and (-) malic acids through a series of reactions. This conversion suggested the involvement of optical inversion during the substitution reaction. Further, in 1930, Sir Christopher Ingold described for the first time two different forms of nucleophilic substitution reactions, which are known as SN1 (nucleophilic substitution unimolecular) and SN2 (nucleophilic substitution...
16.6K