隔离子子-甲氨酸的环-氧化状态
Wen Zhou1, Declan McKearney1, Yusuke Okada2
1Department of Chemistry, Simon Fraser University, 8888 University Drive, Burnaby, BC, V5A 1S6, Canada. dleznoff@sfu.ca.
概括
研究人员描述了降解和氧化子亚甲氨酸复合物的特征. 双重缩小的形式创建了一个三核星团,而单氧化形式显示了非局部化的结合,通过光谱学和计算得到证实.
科学领域:
- * 无机化学 无机化学
- * 材料科学 材料科学
- * 超分子化学 超分子化学
背景情况:
- * 子酸是具有独特电子性质的宏环化合物.
- *了解它们的氧化还原行为对于开发新的功能性材料至关重要.
- *以前的研究已经探索了各种衍生品,但对减少和氧化形式的详细结构和电子表征仍然是活跃的研究领域.
研究的目的:
- * 隔离和结构性表征环减少和环氧化子亚氨酸复合物.
- * 调查还原和氧化对分子结构和电子性质的影响.
- *将光谱数据与理论计算相关联,以了解电子状态.
主要方法:
- * 子亚氨酸复合物的分离和结构特征.
- *光谱分析,包括可见紫外线吸收.
- * 时间依赖密度函数理论 (TD-DFT) 的计算.
主要成果:
- * 隔离双降解和单氧化亚酸物种.
- *双重减少的物种形成了一个三核集群,具有分子内B-N键.
- * 单氧化物种表现出最小的键位定位,表明显著的电子移位.
- *紫外线可见吸收光谱和TD-DFT计算证实了氧化和还原复合物的独特电子状态.
结论:
- * 这项研究成功地描述了子亚酸的新型氧化还原状态.
- * 结果揭示了与还原和氧化相关的独特结构图案和电子特性.
- * 这项工作为子亚硫氨酸的氧化还原化学提供了基本的见解,这与它们在材料科学中的应用有关.
更多相关视频
相关概念视频
Electrophilic Aromatic Substitution: Fluorination and Iodination of Benzene
5.8K
Bromination and chlorination of aromatic rings by electrophilic aromatic substitution reactions are easily achieved, but fluorination and iodination are difficult to achieve. Fluorine is so reactive that its reaction with benzene is difficult to control, resulting in poor yields of monofluoroaromatic products. To address this, Selectfluor reagent is used as a fluorine source in which a fluorine atom is bonded to a positively charged nitrogen.
5.8K
Hydroboration-Oxidation of Alkenes
7.8K
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.
7.8K
Exceptions to the Octet Rule
27.5K
Many covalent molecules have central atoms that do not have eight electrons in their Lewis structures. These molecules fall into three categories:
27.5K
Regioselectivity and Stereochemistry of Hydroboration
8.0K
A significant aspect of hydroboration–oxidation is the regio- and stereochemical outcome of the reaction.
Hydroboration proceeds in a concerted fashion with the attack of borane on the π bond, giving a cyclic four-centered transition state. The –BH2 group is bonded to the less substituted carbon and –H to the more substituted carbon. The concerted nature requires the simultaneous addition of –H and –BH2 across the same face of the alkene giving syn...
Hydroboration proceeds in a concerted fashion with the attack of borane on the π bond, giving a cyclic four-centered transition state. The –BH2 group is bonded to the less substituted carbon and –H to the more substituted carbon. The concerted nature requires the simultaneous addition of –H and –BH2 across the same face of the alkene giving syn...
8.0K
Oxidation of Phenols to Quinones
2.8K
In the presence of oxidizing agents, phenols are oxidized to quinones. Quinones can be easily reduced back to phenols using mild reducing agents. The electron-donating hydroxyl group enhances the reactivity of the aromatic ring, enabling oxidation of the ring even in the absence of an α hydrogen.
o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox...
o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox...
2.8K
Thermal and Photochemical Electrocyclic Reactions: Overview
2.3K
Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
2.3K


