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Organic Compounds03:02

Organic Compounds

All living things are formed mostly of carbon compounds called organic compounds. The category of organic compounds includes both natural and synthetic compounds that contain carbon. Although a single, precise definition has yet to be identified by the chemistry community, most agree that a defining trait of organic molecules is the presence of carbon as the principal element, bonded to hydrogen and other carbon atoms. However, some carbon-containing compounds such as carbonates, cyanides, and...
Acid Strength and Molecular Structure03:05

Acid Strength and Molecular Structure

Binary Acids and Bases
In the absence of any leveling effect, the acid strength of binary compounds of hydrogen with nonmetals (A) increases as the H-A bond strength decreases down a group in the periodic table. For group 17, the order of increasing acidity is HF < HCl < HBr < HI. Likewise, for group 16, the order of increasing acid strength is H2O < H2S < H2Se < H2Te. Across a row in the periodic table, the acid strength of binary hydrogen compounds increases with increasing...
Carboxylic Acid Derivatives: Overview01:15

Carboxylic Acid Derivatives: Overview

Carboxylic acid derivatives are formed by replacing the hydroxyl group of carboxylic acids with a different functional group. The most common carboxylic acid derivatives are:
Structures of Carboxylic Acid Derivatives01:28

Structures of Carboxylic Acid Derivatives

Structure of Carboxylic Acid Derivatives
Carboxylic acid derivatives contain an acyl group attached to a heteroatom such as chlorine, oxygen, or nitrogen. The carbonyl carbon and oxygen are both sp2-hybridized with an unhybridized p orbital.
The three sp2 orbitals of the carbonyl carbon form three σ bonds, one each with the carbonyl oxygen, the α carbon, and the heteroatom, whereas the other two sp2 orbitals of the carbonyl oxygen are occupied by the lone pairs. Further, the unhybridized p...
EDTA: Chemistry and Properties01:22

EDTA: Chemistry and Properties

Polydentate ligands are most widely used in complexometric titrations because they form more stable complexes with the metal ions than mono- or bidentate ligands due to the chelate effect. Examples of polydentate ligands are ethylenediaminetetraacetic acid (EDTA), crown ethers, and cryptands. The most important feature of optimal polydentate ligands is the ability to form 1:1 complexes in a single-step process. Amino carboxylic acid derivatives are frequently used as complexing agents. EDTA is...
EDTA: Auxiliary Complexing Reagents01:26

EDTA: Auxiliary Complexing Reagents

EDTA titrations are usually carried out in highly basic conditions, where the fully deprotonated form of EDTA, Y4−, actively complexes with the free metal ions in the solution. Several metal ions precipitate as hydrous oxide (hydroxides, oxides, or oxyhydroxides) under these conditions, lowering the concentration of free metal ions in the solution. For this reason, auxiliary complexing agents or ligands such as ammonia, tartrate, citrate, or triethanolamine are used in EDTA titrations to...

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Synthesis of High Purity Nonsymmetric Dialkylphosphinic Acid Extractants
12:06

Synthesis of High Purity Nonsymmetric Dialkylphosphinic Acid Extractants

Published on: October 19, 2017

よく定義された,ボロンを含むポリメリックルイス酸である.

Yang Qin1, Guanglou Cheng, Anand Sundararaman

  • 1Department of Chemistry, Rutgers University-Newark, 73 Warren Street, New Jersey 07102, USA.

Journal of the American Chemical Society
|October 24, 2002
PubMed
まとめ

研究者らは,シライラートされたポリマーのボリレーションを使用して,よく定義されたポリマールイス酸を作成するための新しい方法を開発しました. このプロセスは,調整可能なルイス酸性を持つ新しいボロンを含むポリマーを生成し,ポリマー化学の可能性を拡大します.

科学分野:

  • ポリマー化学のポリマー化学について
  • オルガノボロン化学 オルガノボロン化学
  • マテリアルサイエンス 材料科学

背景:

  • ポリマールイス酸は,多様な用途を持つ貴重な材料です.
  • 機能性ポリマーの制御された合成経路の開発は,依然として重要な課題です.

研究 の 目的:

  • よく定義されたポリマールイス酸への新しい経路を報告する.
  • 新しいボロン含有ポリマーを合成し,特徴づけること.
  • これらの新しいポリマー材料の調整可能なルイス酸性を探求するために.

主な方法:

  • 4-(トリメチルシリル) スタイレンの原子移転基ポリメリゼーション (ATRP) により,シリ化ポリステルン (PS-Si) が得られます.
  • BBr3を用いたPS-Siの定量ボリル化により,ポリー ((4-ジブロモボリルステリン) (PS-B) が得られます.
  • Cu ((C6F5) を含むヌクレオフィルとPS-Bの反応により,新しいポリマールイス酸が生成される.

主要な成果:

  • 制御された分子量と低ポリ分散率 (PDI <1.15) を有する,よく定義されたシライライテッドポリスティレン (PS-Si) が合成されました.
  • 新しい溶解性ボロンを含むポリマールイス酸PS-Bが成功裏に製造されました.

さらに関連する動画

Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly
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Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly

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Synthesis of Strong Adhesive Hydrogel, Gelatin O-Nitrosobenzaldehyde
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Synthesis of Strong Adhesive Hydrogel, Gelatin O-Nitrosobenzaldehyde

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関連する実験動画

Last Updated: Jul 5, 2026

Synthesis of High Purity Nonsymmetric Dialkylphosphinic Acid Extractants
12:06

Synthesis of High Purity Nonsymmetric Dialkylphosphinic Acid Extractants

Published on: October 19, 2017

Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly
09:34

Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly

Published on: February 6, 2020

Synthesis of Strong Adhesive Hydrogel, Gelatin O-Nitrosobenzaldehyde
07:04

Synthesis of Strong Adhesive Hydrogel, Gelatin O-Nitrosobenzaldehyde

Published on: November 11, 2022

  • PS-Bは,ニュクレオフィルとの反応性を実証し,変数ルイス酸性を持つポリマーの前駆体として機能しました.
  • トリス (pentafluorophenyl) ボランの第1のポリマーアナログであるポリ[4-bis (pentafluorophenyl) ボリルステレン]が合成されました.

    • 結論:

    • シリアル化されたポリマーのボリル化により,よく定義されたポリマールイス酸への一般的かつ効率的な経路が確立されています.
    • 合成されたボロン含有ポリマーは,調整可能なルイス酸性を示し,新しい材料の開発のためのプラットフォームを提供します.
    • この研究は,新種のポリマールイス酸を導入し,触媒と材料科学における潜在的な応用を提供します.