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Alcohols from Carbonyl Compounds: Reduction02:23

Alcohols from Carbonyl Compounds: Reduction

9.5K
Reduction is a simple strategy to convert a carbonyl group to a hydroxyl group. The three major pathways to reduce carbonyls to alcohols are catalytic hydrogenation, hydride reduction, and borane reduction.
Catalytic hydrogenation is similar to the reduction of an alkene or alkyne by adding H2 across the pi bond in the presence of transition metal catalysts like Raney Ni, Pd–C, Pt, or Ru. Aldehydes and ketones can be reduced by this method, often under mild to moderate heat...
9.5K
Redox Titration: Other Oxidizing and Reducing Agents01:26

Redox Titration: Other Oxidizing and Reducing Agents

1.4K
Besides iodine, other oxidizing or reducing agents can serve as titrants in redox titrations. Common oxidizing titrants include KMnO4, cerium(IV), and K2Cr2O7. The choice of oxidizing titrants depends on factors like stability, cost, analyte strength, and reaction rate between the analyte and titrant. KMnO4 is a strong oxidizing titrant that reduces from Mn(VII) to Mn(II) in a highly acidic solution, simultaneously oxidizing the analyte to a higher oxidation state. In this case, KMnO4 acts as a...
1.4K
Oxidation and Reduction of Organic Molecules01:19

Oxidation and Reduction of Organic Molecules

8.1K
Energy production within a cell involves many coordinated chemical pathways. Most of these pathways are combinations of oxidation and reduction reactions, which occur at the same time. An oxidation reaction strips an electron from an atom in a compound, and the addition of this electron to another compound is a reduction reaction. Because oxidation and reduction usually occur together, these pairs of reactions are called redox reactions.
The removal of an electron from a molecule, results in a...
8.1K
Preparation of Aldehydes and Ketones from Nitriles and Carboxylic Acids01:24

Preparation of Aldehydes and Ketones from Nitriles and Carboxylic Acids

3.7K
Although it is possible to reduce a carboxylic acid to an aldehyde, strong reducing agents, like lithium aluminum hydride (LAH), prohibit a controlled reduction, instead causing the generated aldehyde to instantly over-reduce to a primary alcohol.
Reducing carboxylic acid derivatives like acyl chlorides (RCOCl), esters (RCO2R′), and nitriles (RCN) using milder aluminum hydride agents like lithium tri-tert-butoxyaluminum hydride [LiAlH(O-t-Bu)3] and diisobutylaluminum hydride [DIBAL-H]...
3.7K
Radical Formation: Homolysis00:54

Radical Formation: Homolysis

3.6K
A bond is formed between two atoms by sharing two electrons. When this bond is broken by supplying sufficient energy, either two electrons can be taken up by one atom forming ions by the cleavage called heterolysis, or the two electrons are shared by two atoms, with one each creating radicals by the cleavage called homolysis.
3.6K
Preparation and Reactions of Thiols02:33

Preparation and Reactions of Thiols

6.8K
Thiols are prepared using the hydrosulfide anion as a nucleophile in a nucleophilic substitution reaction with alkyl halides. For instance, bromobutane reacts with sodium hydrosulfide to give butanethiol.
6.8K

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最も容易にイオン化する分子を溶解させ,強力な還元剤を生成します.

Gina M Chiarella1, F Albert Cotton, Jason C Durivage

  • 1Department of Chemistry, Texas A&M University , College Station, Texas 77842-3012, United States.

Journal of the American Chemical Society
|October 29, 2013
PubMed
まとめ

パドルホイール構造を持つ新しいW2化合物は,記録的に低いイオン化エネルギーと負の酸化ポテンシャルを示しています. これらの安定した,簡単に合成される化合物は,特定の溶媒における強力な還元剤としての潜在能力を示しています.

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A Facile and Efficient Approach for the Production of Reversible Disulfide Cross-linked Micelles
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科学分野:

  • 無機化学 無機化学とは
  • 有機金属化学 有機金属化学
  • 電気化学 電気化学について

背景:

  • グアニジナートリガンドは,金属同士の結合を安定させることが知られている.
  • パドルホイール構造は,二核金属複合体における一般的なモチーフです.
  • レドックス特性調節は,新しい還元剤の開発に不可欠です.

研究 の 目的:

  • バイサイクルグアニジナートリガンドによる新しいW2化合物の合成と特徴づけ.
  • これらのW2化合物の電子およびリドックス性質を調査する.
  • ステキオメトリック還元剤としての潜在能力を評価する.

主な方法:

  • W2 ((バイサイクルグアニジナート) 4化合物の合成.
  • THFで電気化学測定 (サイクル電圧計) を行う.
  • 密度関数理論 (DFT) の計算.密度関数理論 (DFT) の計算.密度関数理論 (DFT) の計算.密度関数理論 (DFT) の計算.密度関数理論 (DFT) の計算.密度関数理論 (DFT) の計算.密度関数理論 (DFT) の計算.

主要な成果:

  • 化合物は記録的に低い電離エネルギー (3.4〜3.5 eV) を表しています.
  • THFで非常に負の酸化ポテンシャルが観察されました (-1.84〜-1.90V vs Ag/AgCl).
  • DFT計算は,ガス相イオン化エネルギーと溶液のリドックスポテンシャルと化学的振る舞いを相関させる.

結論:

  • 合成されたW2化合物は熱的に安定し,高収量と純度で容易に調製されます.
  • これらの化合物は高度に反応性があり,ステキオメトリック還元剤としての潜在能力を示しています.
  • それらの有用性は,非極性,非プロトン化溶媒システムに示唆されています.