弗拉文用分子氧气催化了硫化物和氨基的氧化
Yasushi Imada1, Hiroki Iida, Satoshi Ono
1Department of Chemistry, Graduate School of Engineering Science, Osaka University, 1-3, Machikaneyama, Toyonaka, Osaka 560-8531, Japan. mura@chem.es.osaka-u.ac.jp
Journal of the American Chemical Society
|March 6, 2003
概括
这项研究引入了一种新的生物仿真氧化方法,使用有机催化剂和空气. 这种高效的过程氧化各种有机基质,仅产生水和作为副产品.
科学领域:
- 有机化学 有机化学
- 催化剂是一种催化剂.
- 绿色化学 绿色化学
背景情况:
- 传统的氧化方法通常涉及苛刻的试剂,并产生危险的废物.
- 开发可持续和高效的氧化催化剂对于绿色化学至关重要.
研究的目的:
- 开发一种新的,对环境无害的生物仿真氧化方法.
- 为了研究一种有机催化剂对各种基质的有氧氧化效率.
主要方法:
- 硫化物,二次胺,N-胺和三级胺的有氧氧氧化.
- 作为有机催化剂,使用了5-乙基-3-甲基米黄甲酸.
- 在2,2,2-三乙醇中使用氨酸单水合物作为减少剂,在空气或1 atm分子氧气下使用.
主要成果:
- 实现有机基质的高效氧化.
- 获得了相应的氧化化合物,产量很好.
- 观察到水和分子作为环境无害的副产品的形成.
- 证明了硫化物氧化时的营业额 () 为19,000.
结论:
- 开发的生物模拟氧化是一种高效和绿色的替代方案.
- 器官催化剂系统在各种基质氧化中具有广泛的适用性.
- 这种方法提供了一种可持续的有机合成方法,对环境的影响最小.
相关概念视频
Oxidative Cleavage of Alkenes: Ozonolysis
In ozonolysis, ozone is used to cleave a carbon–carbon double bond to form aldehydes and ketones, or carboxylic acids, depending on the work-up.
Ozone is a symmetrical bent molecule stabilized by a resonance structure.
Ozone is a symmetrical bent molecule stabilized by a resonance structure.
Oxidation of Alcohols
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:
Preparation and Reactions of Thiols
Thiols are prepared using the hydrosulfide anion as a nucleophile in a nucleophilic substitution reaction with alkyl halides. For instance, bromobutane reacts with sodium hydrosulfide to give butanethiol.
Preparation and Reactions of Sulfides
Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.
Oxidation of Phenols to Quinones
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 property is crucial in...
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 property is crucial in...
Electrophilic Aromatic Substitution: Fluorination and Iodination of Benzene
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.


