鉄 (III) 窒素/TEMPO触媒によるエアロビックアルコールの酸化: シリアル対統合レドックス協同性の区別
Jordan E Nutting1, Kaining Mao1, Shannon S Stahl1
1Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, Wisconsin 53706, United States.
Journal of the American Chemical Society
|July 7, 2021
まとめ
この研究は,アルコールの酸化のための新しい鉄/アミノキシル触媒システムを明らかにし,リドックスカスケードを通じて"連続協力性"を示しています. これは,酸化反応における新しい化学選択性を提供する銅触媒と異なる.
科学分野:
- カタリシス
- 有機化学
- 無機化学
背景:
- 移行金属とアミノキシルを使用した協同触媒は,アルコール酸化の鍵です.
- 銅/アミノキシル系は,アルコール酸化において"統合された協力性"を示す.
- 鉄/アミノキシル系は独特の触媒メカニズムを示している.
研究 の 目的:
- エロビックアルコール酸化のための新しい鉄/アミノキシル触媒システムのメカニズムを調査する.
- 鉄触媒システムにおける"連続協力"の証拠を提供するために.
- 鉄と銅ベースの触媒のメカニズム的な違いを比較する.
主な方法:
- エアロビックアルコール酸化反応
- 中間物質のインシット検出のためのサイクルステップクロノアンペロメトリー
- 鉄 (III) 酸塩による酸化還元サイクルの研究
主要な成果:
- Fe/アミノキシル系における"連続協力性"の証拠が見つかりました.
- オキシダントとしてオキシアンモニウム種が直接検出されました.
- NOベースのリドックスサイクルは,アミノキシル/ヒドロキシラミンの酸化をオキソアンモニウムに開始する.
- Cu/アミノキシル系と比較して,明確な化学選択性と機能群相性が見られた.
結論:
- Fe/アミノキシル触媒システムは,Cu/アミノキシルシステムの"統合された協力性"とは異なる"連続協力性"によって動作する.
- 機械的差異は,鉄 (III) 酸塩による NO ベースのリドックスサイクルに起因する.
- これは,選択的なアルコール酸化のための新しい道を提供し,機能的なグループの耐性を調整します.
関連する概念動画
02:37Oxidation of Alcohols
14.2K
In this lesson, the oxidation of alcohols is discussed in depth. The various reagents used for oxidation of primary and secondary alcohols are detailed, and their mechanism of action is provided.
The process of oxidation in a chemical reaction is observed in any of the three forms:
The process of oxidation in a chemical reaction is observed in any of the three forms:
14.2K
01:26Redox Titration: Other Oxidizing and Reducing Agents
501
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...
501
01:21Radical Oxidation of Allylic and Benzylic Alcohols
2.4K
Activated manganese(IV) oxide can selectively oxidize allylic and benzylic alcohols via a radical intermediate mechanism. Primary allylic alcohols are oxidized to aldehydes, while secondary allylic alcohols yield ketones. The redox reaction of potassium permanganate with an Mn(II) salt such as manganese sulfate (under either alkaline or acidic conditions), followed by thorough drying, yields the oxidizing agent: activated MnO2. While MnO2 is insoluble in the solvents used for the reaction, the...
2.4K
01:23Redox Equilibria: Overview
1.3K
A reduction-oxidation reaction is commonly called a redox reaction. In a redox reaction, electrons are transferred from one species to another rather than being shared between or among atoms. The reducing agent or reductant is the species that loses electrons and gets oxidized in the process. The species that gains electrons and gets reduced in the process is the oxidizing agent or oxidant. Redox reactions are represented as two separate equations called half-reactions, where one equation...
1.3K
01:21Redox Titration: Overview
3.7K
Redox titration is a chemical analysis technique used to determine the concentration of an unknown substance by measuring the electron transfer in a redox (reduction-oxidation) reaction. The process involves gradually adding a titrant with a known concentration of an oxidizing or reducing agent, to the analyte, the solution with an unknown concentration, until reaching the endpoint, which indicates the completion of the reaction between the two substances. Ensuring the analyte is in a single...
3.7K
01:15Oxidations of Aldehydes and Ketones to Carboxylic Acids
4.7K
Oxidation of aldehydes and ketones results in the formation of carboxylic acids. Aldehydes, bearing hydrogen next to the carbonyl group, are easily oxidized compared to ketones. This is because an aldehydic proton can easily be abstracted during oxidation.
Aldehydes readily undergo oxidation in strong oxidizing agents such as potassium permanganate and chromic acid. The oxidation can also be carried out using mild oxidizing agents such as silver oxide. In fact, aldehydes can be easily oxidized...
Aldehydes readily undergo oxidation in strong oxidizing agents such as potassium permanganate and chromic acid. The oxidation can also be carried out using mild oxidizing agents such as silver oxide. In fact, aldehydes can be easily oxidized...
4.7K