化和化复合物:合成,结构,反应性和与基胺化相关性
Yahong Li1, Yanhui Shi, Aaron L Odom
1Department of Chemistry, Michigan State University, East Lansing, MI 48824, USA.
Journal of the American Chemical Society
|February 12, 2004
概括
合成和表征胺和化复合物. 这项研究解释了复合体在氨酸胺化中的较差催化活性,为开发改进的催化剂提供了洞察力.
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.
- 合成化学 合成化学
背景情况:
- 复合物被研究用于催化应用.
- 了解连接体交换和反应性对于催化剂设计至关重要.
研究的目的:
- 为了合成和表征新的化物和化物复合物.
- 为了研究这些复合物在胺化反应中的反应性.
- 阐明不同催化活性的原因.
主要方法:
- 通过连接物交换反应合成复合物.
- 使用光谱和结构方法进行表征.
- 在基因的胺化中对催化活性的评估.
主要成果:
- 成功合成和表征化物复合物 (2-4) 和各种化物复合物 (5-10).
- 化合物1-3在氨酸胺化中表现出类似的催化活性.
- 在氨酸胺化中观察到较差的催化活性,并归因于某些氨酸复合物的无法转化为单体物种.
结论:
- 由于bis[微-化(2-) 复合体7不能单体化,因此阻碍了氨酸胺化催化.
- 这一局限性通过合成Ti(NMe(2))(2)(dap)(2) 被克服,它是基因的氨酸胺化活性催化剂.
相关概念视频
02:17Synthesis and Decomposition Reactions
Synthesis and decomposition are two types of redox reactions. Synthesis means to make something, whereas decomposition means to break something. The reactions are accompanied by chemical and energy changes.
02:34Structural Isomerism
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can be...
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can be...
02:34Polymers
The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the properties that they exhibit. Additionally,...
02:34Polymers
The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the properties that they exhibit. Additionally,...
00:54Radical Formation: Homolysis
A bond is formed between two atoms by sharing two electrons. When this bond is broken by supplying sufficient energy, either two electrons can be taken up by one atom forming ions by the cleavage called heterolysis, or the two electrons are shared by two atoms, with one each creating radicals by the cleavage called homolysis.
01:10C–C Bond Formation: Aldol Condensation Overview
Aldol condensation is an important route in synthetic organic chemistry used to generate a new carbon–carbon bond under basic or acidic conditions. The aldol condensation reaction presented in Figure 1 constitutes an aldol addition reaction followed by the dehydration process.