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Cross-reactivity00:42

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Enols are a class of compounds where a hydroxyl group is attached to a carbon–carbon double bond, which implies that it is a vinyl alcohol. A carbonyl compound with an α hydrogen undergoes keto–enol tautomerism and remains in equilibrium with its tautomer, the enol form. Usually, the keto tautomer is present in a higher concentration than the enol tautomer due to the higher bond energy of C=O compared to C=C. Moreover, the direction of the keto–enol equilibrium is...
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Reactivity of Enolate Ions01:23

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Enolate ions are formed by the acid–base reaction of a carbonyl compound with a base. This leads to deprotonation of the α hydrogen atom, leading to a resonance-stabilized enolate ion where one of the contributing structures is an oxyanion, which imparts additional stability. Therefore, the proton on the α carbon is more acidic in nature than that of other sp3-hybridized C–H bonds but less acidic than those in O–H bonds where the negative charge in the conjugate...
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Radical Reactivity: Overview01:11

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Radicals, the highly reactive species, gain stability by undergoing three different reactions. The first reaction involves a radical-radical coupling, in which a radical combines with another radical, forming a spin‐paired molecule. The second reaction is between a radical and a spin‐paired molecule, generating a new radical and a new spin‐paired molecule. The third reaction is radical decomposition in a unimolecular reaction, forming a new radical and a spin‐paired...
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Radicals adjacent to electron-donating groups are called nucleophilic radicals. These radicals readily react with electrophilic alkenes. The SOMO–LUMO interactions are the driving force for the reaction, where the high-energy SOMO of the electron-rich, nucleophilic radicals interacts with the low-energy LUMO of the electron-deficient, electrophilic alkenes. Such SOMO–LUMO interactions are the basis of reactive radical traps, affecting the selectivity in radical reactions. For...
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Radical reactions can occur either intermolecularly or intramolecularly. In an intermolecular radical reaction, a nucleophilic radical adds to an electrophilic alkene or vice versa. In such reactions, the radical and generally the alkene, which is also called the radical trap, are two different molecules. Additionally, for such intermolecular reactions to occur, the radical trap must be active, present in an excess concentration, and the radical starting material must have a weak...
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キノリントライラジカル:反応性研究

Raghavendhar R Kotha1, Ravikiran Yerabolu1, Mohammad Sabir Aqueel1

  • 1Department of Chemistry , Purdue University , 560 Oval Drive , West Lafayette , Indiana 47907 , United States.

Journal of the American Chemical Society
|April 5, 2019
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まとめ

陽子化キノリントリラジカルは,陽子移転と水素原子抽出を含む新しい2段階のメカニズムを通じて二甲酸塩と反応し,豊富な二甲酸塩基カチオンを形成する.

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科学分野:

  • 物理化学
  • 有機化学
  • マススペクトロメトリー

背景:

  • 陽子化されたキノリン基は,様々な化学プロセスにおける重要な中間物質である.
  • ガス相反応性を理解することは,反応機構の解明に不可欠である.

研究 の 目的:

  • ダイメチル二硫化物 (DMDS) による陽子化キノリン基のモノ,ビ,トリラジカルのガス相反応機構を調査する.
  • トライラジカルから大量に存在するDMDSラジカルカチオンの予期せぬ形成を解明する.

主な方法:

  • 線形四極イオントラップ質量スペクトロメーターを用いたガス相反応性研究.
  • 提案されたメカニズムをサポートする量子化学計算.
  • デュテラテッドとメチラテッドのトリラジカルを使った研究

主要な成果:

  • モノとビラジカルは予想されるチオメチル抽出を示した.
  • トライラジカルは予期せぬほど大量のDMDSのカチオンを生成した.
  • プロトンの移転と水素原子の抽象化を含む新しい2段階のメカニズムが提案され,支持されました.

結論:

  • トライラジカルに対する反応メカニズムは,モノラジカルとビラジカルとは大きく異なる.
  • 陽子の移転に続く水素原子抽象は,観測された産物分布を説明する.
  • 陽子の親和性や 電子の親和性といった 根本的な性質が 反応経路を支配します