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関連する概念動画

The Phosphorus Cycle01:21

The Phosphorus Cycle

42.9K
Unlike carbon, water, and nitrogen, phosphorus is not present in the atmosphere as a gas. Instead, most phosphorus in the ecosystem exists as compounds, such as phosphate ions (PO43-), found in soil, water, sediment and rocks. Phosphorus is often a limiting nutrient (i.e., in short supply). Consequently, phosphorus is added to most agricultural fertilizers, which can cause environmental problems related to runoff in aquatic ecosystems.
42.9K
Sulfur Assimilation01:20

Sulfur Assimilation

175
Sulfur is an essential element in biological systems, contributing to synthesizing key biomolecules, including amino acids such as cysteine and methionine, and cofactors such as coenzyme A and biotin. Microorganisms primarily assimilate sulfur as sulfate (SO₄²⁻) from the environment, which must undergo a series of biochemical transformations before it can be incorporated into cellular components. As sulfate is highly oxidized, it must undergo assimilatory sulfate reduction to...
175
Preparation and Reactions of Sulfides02:26

Preparation and Reactions of Sulfides

5.4K
Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.
5.4K
α-Bromination of Carboxylic Acids: Hell–Volhard–Zelinski Reaction01:15

α-Bromination of Carboxylic Acids: Hell–Volhard–Zelinski Reaction

3.4K
The method to achieve α-brominated carboxylic acids using a mixture of phosphorus tribromide and bromine is known as the Hell–Volhard–Zelinski reaction. The reaction is catalyzed by phosphorus tribromide, which can be used directly or produced in situ from red phosphorus and bromine. The mechanism comprises PBr3 catalyzed conversion of acid to acid bromide and hydrogen bromide. The acid bromide enolizes to its enol form in the presence of HBr. The nucleophilic enol attacks the...
3.4K
Diversity of Archaea III01:27

Diversity of Archaea III

193
Crenarchaeota, a prominent phylum of Archaea, is remarkable for its ability to thrive in extreme environments characterized by high temperatures and acidity. These microorganisms inhabit sulfuric hot springs, volcanic systems, and submarine hydrothermal vents, where temperatures often exceed 100°C. The unique adaptations of Crenarchaeota not only allow survival under such extreme conditions but also provide insights into the mechanisms of life in primordial Earth-like...
193
Carboxylic Acids to Acid Chlorides01:18

Carboxylic Acids to Acid Chlorides

8.1K
Carboxylic acids react with SOCl2 or PCl5 to form acid chlorides. Amongst the carboxylic acid derivatives, acid chlorides are the most reactive and synthetically important derivatives. They are useful reagents for Friedel–Crafts acylation of some aromatic compounds.
8.1K

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関連する実験動画

Updated: Nov 14, 2025

Synthesis of High Purity Nonsymmetric Dialkylphosphinic Acid Extractants
12:06

Synthesis of High Purity Nonsymmetric Dialkylphosphinic Acid Extractants

Published on: October 19, 2017

7.7K

隔離可能なフォスファとアルサアルメン

Malte Fischer1, Samuel Nees2,3, Thomas Kupfer2,3

  • 1Leibniz Institut für Katalyse e.V. (LIKAT), A.-Einstein-Str.3a, 18059 Rostock, Germany.

Journal of the American Chemical Society
|March 10, 2021
PubMed
まとめ
この要約は機械生成です。

研究者は,アルミニウム複合体とピニクタ・ウィッティグ反応剤を使用して,新しいピニクタアルミニウムと3つ構成の芳香環システムを合成した. これらの化合物は 独特の極化結合と 分子内安定性を特徴として 有機金属化学を進めている.

さらに関連する動画

Preparation and Reactivity of a Triphosphenium Bromide Salt: A Convenient and Stable Source of PhosphorusI
08:46

Preparation and Reactivity of a Triphosphenium Bromide Salt: A Convenient and Stable Source of PhosphorusI

Published on: November 22, 2016

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Author Spotlight: Experimental Approaches for the Synthesis of Low-Valent Metal-Organic Frameworks from Multitopic Phosphine Linkers
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Author Spotlight: Experimental Approaches for the Synthesis of Low-Valent Metal-Organic Frameworks from Multitopic Phosphine Linkers

Published on: May 12, 2023

3.5K

関連する実験動画

Last Updated: Nov 14, 2025

Synthesis of High Purity Nonsymmetric Dialkylphosphinic Acid Extractants
12:06

Synthesis of High Purity Nonsymmetric Dialkylphosphinic Acid Extractants

Published on: October 19, 2017

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Preparation and Reactivity of a Triphosphenium Bromide Salt: A Convenient and Stable Source of PhosphorusI
08:46

Preparation and Reactivity of a Triphosphenium Bromide Salt: A Convenient and Stable Source of PhosphorusI

Published on: November 22, 2016

8.0K
Author Spotlight: Experimental Approaches for the Synthesis of Low-Valent Metal-Organic Frameworks from Multitopic Phosphine Linkers
07:14

Author Spotlight: Experimental Approaches for the Synthesis of Low-Valent Metal-Organic Frameworks from Multitopic Phosphine Linkers

Published on: May 12, 2023

3.5K

科学分野:

  • 有機金属化学
  • メイングループ 化学
  • 合成化学

背景:

  • (AlCp*) 4のようなアルミニウム複合体は,反応性のある単体アルミニウム種の前駆体として機能する.
  • DipTerPnPMe3 (Pn = P, As) などのピニクタ・ウィティッグ反応剤は,元素対元素の多重結合を形成するための貴重なツールである.

研究 の 目的:

  • 単体アルミニウム種の反応性を pnicta-Wittig反応剤で調査する.
  • 新しいアルミニウム-プニクトゲン化合物を合成し,特徴づけること.
  • 構造的特徴と結合を調査する

主な方法:

  • (AlCp*) 4とTerPnPMe3が80 °Cで反応する.
  • メスとTerPPMe3の反応は,AlCp3tまたはAlCp*の2つの等価である.
  • 顕微鏡および構造的方法 (暗示) を用いて製品の特徴づけ.

主要な成果:

  • 極化されたPn-Al二重結合によるpnictaalumenesDipTerPnAlCp*のクリーン形成.
  • Al- aryl相互作用によってpnictaalumenesで観察された分子内安定化.
  • 3基の2π-芳香環系MesTerP(AlCp) 2 (x = 3t, *) の合成について

結論:

  • この研究は,新しいオルガノアルミニウム-プニクトゲン化合物への汎用的な合成経路を示しています.
  • 結果は,極化されたPn-Al二重結合とユニークな芳香環の形成を強調しています.
  • この研究は,ピニクタ-ウィティグ化学とオルガノアルミニウム合成の範囲を拡大する.