相关实验视频
Updated: Jul 8, 2025
11:15
HKUST-1 as a Heterogeneous Catalyst for the Synthesis of Vanillin
Published on: July 23, 2016
10.3K
无溶剂和无添加剂的N-异环氧的脱,用氧气催化,由多氧酸基金属有机框架
Hongrui Tian1, Yingying Pan1, Na Xu1
1Department of Chemistry and Shenzhen Grubbs Institute, Southern University of Science and Technology, Shenzhen 518055, Guangdong, China.
Inorganic chemistry
|December 11, 2023
概括
这项研究引入了基于聚氧二酸盐的新型金属有机框架,通过催化氧化脱 (ODH) 进行高效的N-heteroarene合成. 这些催化剂利用分子氧气,避免恶劣的条件,为有价值的有机化合物提供更绿色的方法.
科学领域:
- 材料科学 材料科学 材料科学
- 催化剂是一种催化剂.
- 有机化学 有机化学
背景情况:
- 甲是重要的有机化合物,在制药和化学中广泛应用.
- 传统的N-异质合成通常涉及N-异质环的催化氧化脱 (ODH),经常需要恶劣的条件,添加剂和有机溶剂.
- 需要更可持续,更有效的催化系统来生产N-heteroarene.
研究的目的:
- 合成和描述基于多氧酸的新型金属有机框架 (MOF).
- 为了证明这些MOFs作为N-异环环的氧化脱 (ODH) 催化剂的有效性.
- 调查催化机制并探索开发的MOF催化剂的基质范围.
主要方法:
- 基于多氧纳酸的MOF的合成,其一般配方是{[MII(bibp) 1.5][VV2O6]}·H2O (M = Ni,Co;bibp = 4,4'-(bisimidazol-1-ylmethyl) 双).
- 用分子氧作为氧化剂对各种N-异环的ODH合成的MOF进行催化试验.
- 使用电子磁共振 (EPR) 和X射线光电谱 (XPS) 阐明反应途径的机械研究.
主要成果:
- 两个新型的MOF,{[NiII(bibp) 1.5][VV2O6]}·H2O (1) 和{[CoII(bibp) 1.5][VV2O6]}·H2O (2),已经成功地准备好了.
- 催化剂1在各种N-异环的ODH中表现出高效率和选择性,包括替代的2,3-二-1H-英和四基诺林.
- 机械学研究表明,MOF 1中的V^V位点是活性中心,涉及单个电子转移和超氧化基离子形成.
结论:
- 开发的基于聚氧瓦纳的MOFs代表了可持续N-heteroarene合成的有前途的催化剂类.
- 这些催化剂提供了诸如使用非贵金属,分子氧作为氧化剂,避免添加剂和有机溶剂等优势.
- 这些发现为ODH反应的催化机制提供了有价值的见解,ODH反应由基于的MOFs介导.
相关概念视频
02:44Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide
10.2K
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.
10.2K
02:21Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate
11.6K
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.
11.6K
02:04Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids
5.9K
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.
5.9K
01:28Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation
4.6K
Unlike the easy catalytic hydrogenation of an alkene double bond, hydrogenation of a benzene double bond under similar reaction conditions does not take place easily. For example, in the reduction of stilbene, the benzene ring remains unaffected while the alkene bond gets reduced. Hydrogenation of an alkene double bond is exothermic and a favorable process. In contrast, to hydrogenate the first unsaturated bond of benzene, an energy input is needed; that is, the process is endothermic. This is...
4.6K
02:13Reduction of Alkenes: Catalytic Hydrogenation
12.1K
Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called catalytic hydrogenation.
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the...
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the...
12.1K
02:47Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation
18.1K
Introduction
One of the convenient methods for the preparation of aldehydes and ketones is via hydration of alkynes. Hydroboration-oxidation of alkynes is an indirect hydration reaction in which an alkyne is treated with borane followed by oxidation with alkaline peroxide to form an enol that rapidly converts into an aldehyde or a ketone. Terminal alkynes form aldehydes, whereas internal alkynes give ketones as the final product.
One of the convenient methods for the preparation of aldehydes and ketones is via hydration of alkynes. Hydroboration-oxidation of alkynes is an indirect hydration reaction in which an alkyne is treated with borane followed by oxidation with alkaline peroxide to form an enol that rapidly converts into an aldehyde or a ketone. Terminal alkynes form aldehydes, whereas internal alkynes give ketones as the final product.
18.1K