实用的新型基于锡基的基转化催化剂,具有优化的活性和选择性概况
Johannes Heppekausen1, Robert Stade, Richard Goddard
1Max-Planck-Institut für Kohlenforschung, D-45470 Mülheim/Ruhr, Germany.
Journal of the American Chemical Society
|August 12, 2010
概括
新的基利丁复合物与三基酸连接物使多功能基甲基反应成为可能. 这些催化剂具有很高的功能组耐受性,即使在环境温度下也可以轻松处理.
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.
- 有机合成 有机合成
背景情况:
- 基转化是有机合成中形成碳-碳键的关键反应.
- 开发具有高度反应性,功能组耐受性和易于处理的催化剂仍然是一个关键挑战.
研究的目的:
- 开发用于基基因转基因的新型基化复合物.
- 研究这些新复合物的催化活性,稳定性和范围.
- 优化反应条件以提高效率和更广泛的适用性.
主要方法:
- 合成含有三西拉诺酸联体的基利丁复合物.
- 在现场从化前体生成活性物种.
- 与1,10-phenanthroline复合,形成稳定在空气中的附加物.
- 在各种分子间和分子内基转化反应中进行催化试验.
- 使用分子和X射线晶体学进行结构分析的优化.
主要成果:
- 三基酸连接物对基类催化剂具有出色的反应性和功能组耐受性.
- 稳定在空气中的类添加物可以很容易地被激活用于催化.
- 在环境温度下反应有效地进行,使用分子观察到显著的产量和速度改善.
- 在合成生物活性天然产品中的成功应用证明了其广泛的范围.
结论:
- 新型的基利丁复合物与三基酸连接体代表了一代新一代高效的基因转化催化剂.
- 这些催化剂为从业者提供了实际的选择,因为它们易于操作,广泛适用性和耐受性.
- 使用分子提高了反应效率,使反应条件更温和,并简化了基质要求.
相关概念视频
Olefin Metathesis Polymerization: Overview
Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists of a...
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists of a...
Oxidation 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.
Reduction 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.
Preparation of Alkynes: Alkylation Reaction
Introduction
Alkylation of terminal alkynes with primary alkyl halides in the presence of a strong base like sodium amide is one of the common methods for the synthesis of longer carbon-chain alkynes. For example, treatment of 1-propyne with sodium amide followed by reaction with ethyl bromide yields 2-pentyne.
Alkylation of terminal alkynes with primary alkyl halides in the presence of a strong base like sodium amide is one of the common methods for the synthesis of longer carbon-chain alkynes. For example, treatment of 1-propyne with sodium amide followed by reaction with ethyl bromide yields 2-pentyne.
Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation
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.
Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)
Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...


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