在基于聚氧甲酸盐的混合物上进行有效的氧化激活,用于基因的环氧化
Xue Bai1, Maochun Zhu1, Yifei Liu1
1Key Laboratory of Polyoxometalate and Reticular Material Chemistry of Ministry of Education, College of Chemistry, Northeast Normal University, Changchun 130024, China. liusx@nenu.edu.cn.
Dalton transactions (Cambridge, England : 2003)
|April 10, 2024
概括
与类同类相比,以为基础的聚氧甲酸杂交物显示出增强的烯酸环氧化活性. 这种提高的性能源于和聚氧甲酸盐之间的协同作用,产生了高度活性的过氧酸性物种.
科学领域:
- 材料化学 材料化学
- 催化剂是一种催化剂.
- 无机化学 无机化学 有机化学
背景情况:
- 聚氧甲酸盐 (POMs) 是具有可调节性质的多功能无机集群.
- 结合POM的混合材料提供了独特的催化功能.
- 奥莱芬环氧化是有机合成中的关键转化.
研究的目的:
- 合成和描述基于聚氧甲酸盐的新型混合材料.
- 为了研究这些混合物的催化活性在olefin环氧化.
- 阐明结构-活性关系和催化机制.
主要方法:
- 基于聚氧甲酸盐的混合物的合成:[M(btap) 3 ((H2O) 3 ((HPW12O40) ]·xH2O (M-PW,M = Co/Mn).
- 使用合成的杂交物,对olefin环氧化进行催化试验.
- 用于材料表征和机械学研究的光谱和分析技术.
主要成果:
- -多氧金属 (Co-PW) 和-多氧金属 (Mn-PW) 两种混合物都成功合成了.
- 与Mn-PW相比,Co-PW在olefin环氧化中的活性和选择性显著更高.
- 有证据表明,Co-PW中的Co-II中心和多氧甲 (PW) 之间存在协同效应.
结论:
- 合成的Co-PW混合物是一种高效的催化剂,用于olefin环氧化.
- 增强的性能归因于O2被Co(II) 激活到超氧化基离子 (•O2−) 和PW随后的质子化,形成过氧酸.
- 这项研究强调了基于POM的混合动力在开发高效的催化系统方面的潜力.
相关概念视频
02:44Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide
10.1K
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.
10.1K
03:00Preparation of Epoxides
7.7K
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...
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...
7.7K
02:04Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids
5.8K
Diols are compounds with two hydroxyl groups. In addition to syn dihydroxylation, diols can also be synthesized through the process of anti dihydroxylation. The process involves treating an alkene with a peroxycarboxylic acid to form an epoxide. Epoxides are highly strained three-membered rings with oxygen and two carbons occupying the corners of an equilateral triangle. This step is followed by ring-opening of the epoxide in the presence of an aqueous acid to give a trans diol.
5.8K
02:21Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate
11.4K
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.
11.4K
02:57Sharpless Epoxidation
4.0K
The conversion of allylic alcohols into epoxides using the chiral catalyst was discovered by K. Barry Sharpless and is known as Sharpless epoxidation. The use of a chiral catalyst enables the formation of one enantiomer of the product in excess. This chiral catalyst is mainly a chiral complex of titanium tetraisopropoxide and tartrate ester (specific stereoisomer). The stereoisomer used in the chiral catalyst dictates the formation of the enantiomer of the product. In other words, the use of...
4.0K
01:46Oxidative Cleavage of Alkenes: Ozonolysis
10.3K
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.
10.3K