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β-Dicarbonyl Compounds via Crossed Claisen Condensations01:18

β-Dicarbonyl Compounds via Crossed Claisen Condensations

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.
Vicinal Diols via Reductive Coupling of Aldehydes or Ketones: Pinacol Coupling Overview01:27

Vicinal Diols via Reductive Coupling of Aldehydes or Ketones: Pinacol Coupling Overview

Wilhelm Rudolph Fittig discovered the pinacol coupling reaction in 1859. It is a radical dimerization reaction and involves the reductive coupling of aldehydes or ketones in the presence of hydrocarbon solvent to yield vicinal diols.
α-Hydroxy Ketones via Reductive Coupling of Esters: Acyloin Condensation Overview01:19

α-Hydroxy Ketones via Reductive Coupling of Esters: Acyloin Condensation Overview

The pinacol and McMurry reactions involve the reductive coupling of ketones or aldehydes. Similarly, the bimolecular reductive coupling of two ester molecules in the presence of sodium metal in an aprotic solvent yields an α-hydroxy ketone product. The α-hydroxy ketone is also called acyloin, so the reaction is referred to as ‘acyloin condensation.’
Types of Step-Growth Polymers: Polyesters01:20

Types of Step-Growth Polymers: Polyesters

The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the polymer...
Ketones with Nonenolizable Aromatic Aldehydes: Claisen–Schmidt Condensation01:01

Ketones with Nonenolizable Aromatic Aldehydes: Claisen–Schmidt Condensation

Benzaldehyde, like formaldehyde, lacks an α hydrogen and cannot enolize to form an enolate. Hence, the reaction of benzaldehyde with a ketone in the presence of an aqueous base forms a single crossed product. This reaction is referred to as Claisen–Schmidt condensation.
As the self-condensation of ketones is generally not favored in basic conditions, the self-condensed products do not form in the reaction between ketones and benzaldehyde. The general reaction of Claisen–Schmidt condensation is...
Esters to β-Ketoesters: Claisen Condensation Mechanism01:08

Esters to β-Ketoesters: Claisen Condensation Mechanism

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 intermediate restores...

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Preparing Silica Aerogel Monoliths via a Rapid Supercritical Extraction Method
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ポリ (メチルメタクリlate) 基のメソポラスエアロゲル単体への熱可逆の凝縮経路

Saadman Sakib Rahman1, Anthony V Tuccitto1, Zeineb Ben Rejeb1

  • 1Department of Mechanical and Industrial Engineering, University of Toronto, 5 King's College Road, Toronto, M5S 3G8, Canada.

Small (Weinheim an der Bergstrasse, Germany)
|September 1, 2025
PubMed
まとめ

新しいポリメチルメタクリlate (PMMA) エアロゲルは,熱可逆の凝固と超臨界CO2乾燥を使用して作成されました. この軽量で再利用可能な材料は 優れた耐熱性能と油と水の分離能力を有しており 機械的性質のユニークなバランスを示しています

キーワード:
フリンジ・ミセルラメラ網状の構造ソルゲル超臨界CO2サーモゲル

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科学分野:

  • 材料科学
  • ポリマー化学
  • ナノテクノロジー

背景:

  • 軽量で機能的な熱可塑性材料は高い需要があります
  • ポリメチルメタクリレート (PMMA) は一般的な熱可塑性物質ですが,そのエアロゲルはしばしば脆いです.
  • PMMAベースの材料を開発し,その特性や再利用性を向上させることが重要です.

研究 の 目的:

  • ポリメチルメタクリlate (PMMA) とそのステレオコンプレックス結晶から新しい単体エアロゲルを製造する.
  • これらのPMMAエアロゲルの構造-特性関係を調査する.
  • 石油と水の分離と熱絶縁におけるそれらの潜在的な応用を探求する.

主な方法:

  • PMMA溶液の単一ポット熱可逆凝固
  • 合成ゲルの超臨界CO2 (scCO2) 乾燥
  • 毛細度,密度,熱特性,機械特性,吸収能力の特徴

主要な成果:

  • 調節可能な多孔性 (66.6~97.3%) と低密度 (0.03~0.4gcm-3) を有する製造されたPMMAエアロゲル.
  • scCO2乾燥によるPMMAステレオコンプレックス結晶の高融解温度とエンタピーを達成した.
  • 超オレオフィリティと効果的な熱絶縁 (k: 24-65 mW m-1 K-1) と並行して,硬さ,強度,性の顕著なバランスを示した.

結論:

  • PMMAエアロゲルは,熱可逆の凝固とscCO2乾燥によって製造され,例外的な性質を示しています.
  • ナノメートルの結晶構造は 機械性能の向上に貢献しています
  • これらの再利用可能なエアロゲルは,石油と水の分離,熱絶縁,持続可能な材料開発の応用において大きな希望を示しています.