一个两极端甲基利丁复合物的反应
A E Enriquez1, P S White, J L Templeton
1Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, USA.
Journal of the American Chemical Society
|July 18, 2001
概括
这项研究详细介绍了甲基和碳化物复合物的合成. 开发了新的方法来产生阳离子甲基化合物和功能化终端碳化物与电友.
科学领域:
- 有机金属化学 有机金属化学
- 的化学化学 的化学
- 碳和碳复合物 碳和碳复合物
背景情况:
- 甲基和碳复合物是有机金属化学中的关键中间体.
- 了解它们的反应性是开发新合成方法的关键.
- 离子甲基复合物的现有途径通常涉及恶劣的条件或特定的前体.
研究的目的:
- 为了探索甲基复合物的反应性,Tp'(CO)(2)W三重键 C--PPh((3)][PF(6) ].
- 开发新的合成途径,用于生成阳离子甲基和终端碳化物复合物.
- 研究各种电友的终端碳化物复合物的功能化.
主要方法:
- 用三甲基乙基化 (Na[HBEt(3)) 处理前体复合物,以形成甲基利丁和碳中间体.
- 光谱表征包括IR,拉曼和 (1) H, (183) W 2D HMQC NMR.
- 质子化,脱质子化和电友性加法反应,以研究复杂的转换.
主要成果:
- 成功合成甲基利丁复合物Tp'(CO) ((2) W三重键C--H.
- 通过去质子化形成阴离子终端碳化物Tp'(CO) ((2) W三键C--Li.
- 通过将化物添加到甲基利丁复合物中,生成阴离子甲基利丁复合物[Na][Tp'(CO) ((2) W=CH(2) ].
- 用电友 (R = CH(3),SiMe(3),I,C(OH) Ph(2),CH(OH) Ph和C(O) Ph) 对终端碳化物进行功能化,以产生费舍尔碳化物.
- 在28.7.7时确定Tp'{CO}{2}W三重键C--H的pK{a)
结论:
- 通过化物添加,建立了一个新的合成途径,以离子甲基化合物复合物.
- 终端碳化物复合物作为费舍尔碳化物多功能前体.
- 开发的方法为产生关键有机金属中间体提供了更温和的替代方案.
相关概念视频
Crossed Aldol Reaction Using Strong Bases: Directed Aldol Reaction
The reaction between two different carbonyl compounds comprising α hydrogen in the presence of a strong base like lithium diisopropylamide (LDA) to form a crossed aldol product is known as a directed aldol reaction. The directed aldol reaction is depicted in Figure 1.
[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction
The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.
Diels–Alder Reaction Forming Cyclic Products: Stereochemistry
The Diels–Alder reaction is one of the robust methods for synthesizing unsaturated six-membered rings. The reaction involves a concerted cyclic movement of six π electrons: four π electrons from the diene and two π electrons from the dienophile.
Diels–Alder Reaction: Characteristics of Dienes
The Diels–Alder reaction brings together a diene and a dienophile to form a six-membered ring. Both components have unique characteristics that influence the rate of the reaction.
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Conformation
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Characteristics of the diene
Conformation
The simplest example of a diene is 1,3-butadiene, an acyclic conjugated π system. At room temperature, the molecule exists as a mixture of s-cis and s-trans conformers by virtue of rotation around the carbon–carbon single bond. Although the s-trans isomer is more stable, the...
Electrophilic 1,2- and 1,4-Addition of X2 to 1,3-Butadiene
Electrophilic addition of halogens to alkenes proceeds via a cyclic halonium ion to form a 1,2-dihalide or a vicinal dihalide.
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