二次アルコールの高度エナチオセレクティブ分離のためのホモキラルな微孔性の水素結合有機構造体
Peng Li1, Yabing He, Jie Guang
1Department of Chemistry, University of Texas at San Antonio , One UTSA Circle, San Antonio, Texas 78249-0698, United States.
Journal of the American Chemical Society
|January 8, 2014
まとめ
新しいホモキラルな微孔性の水素結合有機構造体 (HOF-2) が合成されました. この材料は,キラルアルコールの優れたエナチオセレクティブ分離を示し,1-フェニルエタノールに対する最大92%のエナチオメリック過剰を達成しています.
科学分野:
- 材料科学 材料科学とは
- 超分子化学 超分子化学
- チラルの分離
背景:
- 水素結合有機フレームワーク (HOF) は,分離と触媒の潜在的応用を持つ多孔性の材料のクラスです.
- チラルの分離は,医薬品と細かい化学品において極めて重要であり,効率的で選択的な方法を必要とします.
- エナチオセレクティブアプリケーションのための新しい多孔性の材料の開発は,依然として重要な課題です.
研究 の 目的:
- 新種のホモキラル微孔性の水素結合有機構造体 (HOF-2) を合成し,特徴づけること.
- キラル二次アルコールのエナンチオセレクティブ分離のためのHOF-2の可能性を調査する.
主な方法:
- ビノール誘導体を用いてHOF-2の合成.
- X線 difraksionなどの技術を用いた構造的特徴化.
- Brunauer-Emmett-Teller (BET) メソッドを用いた孔性の分析.
- キラル二次アルコールを用いたエナチオセレクティブ分離実験で,エナチオメリック過剰 (ee) の決定.
主要な成果:
- HOF-2は成功裏に合成され,構造的にユニノード6連結の {3(3) 5(5) 6(6) 7} ネットワークとして特徴付けられました.
- この材料は,BETの表面積が237.6m2/gの恒久的な多孔性を表しています.
- HOF-2は,キラル二次アルコールを分離する際に高いエナチオセレクティブ性を示し,1-フェニルエタノールで最大92%のEEを達成しました.
結論:
- 新しく合成されたHOF-2は,エナチオセレクティブ分離のための有望なキラル静止相である.
- HOF-2の永続的な多孔性と特異的なネットワーク構造は,その高い分離効率に貢献します.
- この研究は,高度なキラル分離技術におけるHOFの潜在能力を強調しています.
関連する概念動画
02:34Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration
8.1K
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.
8.1K
02:17Reduction of Alkenes: Asymmetric Catalytic Hydrogenation
2.6K
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...
2.6K
02:29Ethers from Alcohols: Alcohol Dehydration and Williamson Ether Synthesis
11.0K
Overview
Ethers can be prepared from organic compounds by various methods. Some of them are discussed below,
Preparation of Ethers by Alcohol Dehydration
In this method, in the presence of protic acids, alcohol dehydrates to produce alkenes and ethers under different conditions. For example, in the presence of sulphuric acid, dehydration of ethanol at 413 K yields ethoxyethane, whereas it yields ethene at 443 K.
Ethers can be prepared from organic compounds by various methods. Some of them are discussed below,
Preparation of Ethers by Alcohol Dehydration
In this method, in the presence of protic acids, alcohol dehydrates to produce alkenes and ethers under different conditions. For example, in the presence of sulphuric acid, dehydration of ethanol at 413 K yields ethoxyethane, whereas it yields ethene at 443 K.
11.0K
02:05Prochirality
4.0K
The concept of prochirality leads to the nomenclature of the individual faces of a molecule and plays a crucial role in the enantioselective reaction. It is a concept where two or more achiral molecules react to produce chiral products. A typical process is the reaction of an achiral ketone to generate a chiral alcohol. Here, the achiral reactant reacts with an achiral reducing agent, sodium borohydride, to generate an equimolar mixture of the chiral enantiomers of the product. For example, an...
4.0K
01:38Preparation of Alcohols via Substitution Reactions
6.5K
Overview
Alcohols can be synthesized from alkyl halides via nucleophilic substitution reactions. The highly polar carbon-halogen bond in the substrate makes halide a good leaving group. The hydroxide ion or water can act as a nucleophile to take the place of halide and form an alcohol. The substitution reactions occur via two different reaction pathways, SN1 or SN2, depending on the nature of carbon attached to the halide.
Primary alcohols are synthesized from primary alkyl halides, and the...
Alcohols can be synthesized from alkyl halides via nucleophilic substitution reactions. The highly polar carbon-halogen bond in the substrate makes halide a good leaving group. The hydroxide ion or water can act as a nucleophile to take the place of halide and form an alcohol. The substitution reactions occur via two different reaction pathways, SN1 or SN2, depending on the nature of carbon attached to the halide.
Primary alcohols are synthesized from primary alkyl halides, and the...
6.5K
02:17Regioselectivity of Electrophilic Additions to Alkenes: Markovnikov's Rule
14.2K
If a set of reactants can yield multiple constitutional isomers, but one of the isomers is obtained as the major product, the reaction is said to be regioselective. In such reactions, bond formation or breaking is favored at one reaction site over others.
The hydrohalogenation of an unsymmetrical alkene can yield two haloalkane products, depending on which vinylic carbon takes up the halogen. However, one product usually predominates, where hydrogen adds to the vinylic carbon bearing the...
The hydrohalogenation of an unsymmetrical alkene can yield two haloalkane products, depending on which vinylic carbon takes up the halogen. However, one product usually predominates, where hydrogen adds to the vinylic carbon bearing the...
14.2K