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関連する概念動画

Alkylation of β-Diester Enolates: Malonic Ester Synthesis01:14

Alkylation of β-Diester Enolates: Malonic Ester Synthesis

4.2K
Malonic ester synthesis is a method to obtain α substituted carboxylic acids from ꞵ-diesters such as diethyl malonate and alkyl halides.
4.2K
Regioselectivity and Stereochemistry of Hydroboration02:36

Regioselectivity and Stereochemistry of Hydroboration

9.5K
A significant aspect of hydroboration–oxidation is the regio- and stereochemical outcome of the reaction.
Hydroboration proceeds in a concerted fashion with the attack of borane on the π bond, giving a cyclic four-centered transition state. The –BH2 group is bonded to the less substituted carbon and –H to the more substituted carbon. The concerted nature requires the simultaneous addition of –H and –BH2 across the same face of the alkene giving syn stereochemistry.
9.5K
β-Dicarbonyl Compounds via Crossed Claisen Condensations01:18

β-Dicarbonyl Compounds via Crossed Claisen Condensations

3.9K
Crossed Claisen condensations are base-promoted reactions between two different ester molecules producing β-dicarbonyl compounds.  The reaction involving esters, with both containing α hydrogen, results in a mixture of four different products that are difficult to isolate. This reduces the synthetic utility of the reaction.
3.9K
Types of Enols and Enolates01:19

Types of Enols and Enolates

3.7K
Aldehydes and ketones form enols, although only about 1% of the enol is present at the equilibrium for simple monocarbonyl compounds. The enol form is undetectable for acetaldehyde, present as only 1.5 × 10−4 % of acetone, and present as only 1.2% of cyclohexanone. Two kinds of regioisomeric enols are possible for unsymmetrical ketones, and their net composition is 1% at equilibrium. This instability is due to the lower bond energy of C=C than the C=O group. The additional...
3.7K
Esters to β-Ketoesters: Claisen Condensation Mechanism01:08

Esters to β-Ketoesters: Claisen Condensation Mechanism

4.8K
Regular Claisen condensation involves the synthesis of β-ketoesters by combining identical ester molecules bearing two α hydrogens in the presence of an alkoxide base. The reaction commences with the deprotonation of the acidic α hydrogen by the base to form a resonance stabilized ester enolate. This nucleophilic ion then attacks the carbonyl center of another ester molecule to generate a tetrahedral alkoxide intermediate. Next, the expulsion of the alkoxide group from the...
4.8K
Alkylation of β-Ketoester Enolates: Acetoacetic Ester Synthesis01:07

Alkylation of β-Ketoester Enolates: Acetoacetic Ester Synthesis

4.6K
Acetoacetic ester synthesis is a method to obtain ketones from alkyl halides and β-keto esters. The reaction occurs in the presence of an alkoxide base that abstracts the acidic proton of the β-keto esters. The step results in an enolate ion which is doubly stabilized. The enolate then reacts with an alkyl halide via the SN2 process to produce an alkylated ester intermediate with a new C–C bond. The hydrolysis of the intermediate, followed by acidification, results in an...
4.6K

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関連する実験動画

Updated: Feb 17, 2026

Directed Assembly of Elastin-like Proteins into defined Supramolecular Structures and Cargo Encapsulation In Vitro
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安定したボロンエステルアセンブリをカスタマイズできる新しいクラスです.

D Coomber1, O Rusli2, H Sharma1

  • 1School of Life and Environmental Sciences, Centre for Sustainable Bioproducts, Deakin University Waurn Ponds VIC 3216 Australia fred.pfeffer@deakin.edu.au.

Chemical science
|February 16, 2026
PubMed
まとめ

研究者らは,ポリノルボルナンビスダイオールとボロン酸を使用して,共性マクロサイクルとケージを作成するためのカスタマイズ可能な方法を開発しました. その結果生成された構造は,優れた安定性と水解への耐性を発揮し,材料科学における多用途のアプリケーションを提供します.

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Synthesis of a Borylated Ibuprofen Derivative Through Suzuki Cross-Coupling and Alkene Boracarboxylation Reactions
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Synthesis of a Borylated Ibuprofen Derivative Through Suzuki Cross-Coupling and Alkene Boracarboxylation Reactions

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科学分野:

  • 有機化学 オーガニック・ケミストリー
  • 超分子化学 超分子化学
  • マテリアルサイエンス 材料科学

背景:

  • 結合性マクロサイクルとケージは,重要な超分子構造である.
  • 効率的でカスタマイズ可能な合成方法の開発は,その応用にとって極めて重要です.
  • ポリノルボナンのフレームワークは,ユニークな構造特性を提供します.

研究 の 目的:

  • 共同的マクロサイクルとケージを合成するための新しい,適応可能な戦略を開発する.
  • コンストラクット・アセンブリのための溶融ポリノルボルナン基ビスダイオールとボロン酸の使用を調査する.
  • 合成されたアーキテクチャの安定性と水解性耐性を評価する.

主な方法:

  • 溶融されたポリノルボラン基ビスダイオールと商用ボロン酸の反応.
  • ビスダイオルの長さと二面角 (90°と180°) のカスタマイズ.
  • ディまたはトリボロン酸と結合して,様々な構造を形成する.

主要な成果:

  • 協和マクロサイクルとケージを組み立てるための効率的でカスタマイズ可能な方法が確立されました.
  • 様々なアーキテクチャへのアクセスは,異なるビスダイオールとボロン酸成分によって達成されました.
  • その結果得られた構造は,水解に対する有意な耐性を示し,薄酸エステル酸または三酸エステル酸に24時間曝露した後でさえも,水解に対する有意な耐性を示した.

結論:

  • 開発されたアプローチは,複雑な共性アーキテクチャの合理的な設計と合成のための汎用的なプラットフォームを提供します.
  • 構造物の水溶性安定性は,要求の厳しい環境での応用の可能性を示唆しています.
  • この方法は,新しいマクロサイクルおよびケージ化合物へのカスタマイズ可能な経路を提供します.