选择性脱氧化化-化反应 divinyldisiloxane 与水素由铁复合物催化
Roman N Naumov1, Masumi Itazaki, Masahiro Kamitani
1Department of Chemistry, Graduate School of Science, Osaka City University, Osaka 558-8585, Japan.
Journal of the American Chemical Society
|December 31, 2011
概括
这项研究揭示了一种新型的催化反应,在这种反应中,水晶经历了与1,3-divinyldisiloxane的脱化和化,形成了意想不到的产品. 一个拟议的催化循环解释了这种独特的化学转化.
科学领域:
- 有机金属化学 有机金属化学
- 催化剂是一种催化剂.
- 化学 化学 化学
背景情况:
- 水化是一种常见的反应,涉及水和不和化合物.
- 1,3-二维尼尔迪西洛是一种多用途的含有的分子,具有两个乙烯基组.
研究的目的:
- 为了研究由 (η(5) -C(5) -H(5)) Fe(CO) ((2) Me.Me催化的水晶和1,3-二维尼尔二氧化之间的反应.
- 为了阐明观察到的意想不到的反应途径的机制.
主要方法:
- 使用特定铁复合物的催化反应.
- 标记实验用于追踪反应中间体.
- 产品特征,以识别产生的化学物种.
主要成果:
- 反应产生了脱化化和化产物,与典型的水化不同.
- 标签为反应机制提供了关键的见解.
- 基于实验证据提出了一个新的催化循环.
结论:
- 发现了一种新的催化反应途径,涉及西兰和1,3-二维尼尔迪西洛.
- 拟议的催化循环解释了观察到的乙烯基组的双重功能.
- 这一发现扩大了有机化学和催化转换的范围.
相关概念视频
02:44Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide
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.
02:17Reduction of Alkenes: Asymmetric Catalytic Hydrogenation
Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
02:24Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation
Introduction
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
02:26Preparation 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.
02:13Reduction of Alkenes: Catalytic Hydrogenation
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 surface of...
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 surface of...
02:34Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration
The rate of acid-catalyzed hydration of alkenes depends on the alkene's structure, as the presence of alkyl substituents at the double bond can significantly influence the rate.