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関連する概念動画

Preparation of Alcohols via Addition Reactions02:15

Preparation of Alcohols via Addition Reactions

6.4K
Overview
The acid-catalyzed addition of water to the double bond of alkenes is a large-scale industrial method used to synthesize low-molecular-weight alcohols. An acidic atmosphere is required to allow the hydrogen in the water molecule to act as an electrophile and attack the double bond in an alkene. The addition of a proton to the double bond creates a carbocation intermediate. The proton preferentially bonds to the less substituted end of the double bond to create a more stable carbocation...
6.4K
Hydrogen Bonds01:04

Hydrogen Bonds

9.1K
A hydrogen bond is formed when a weakly positive hydrogen atom already bonded to one electronegative atom (for example, the oxygen in the water molecule) is attracted to another electronegative atom from another polar molecule, such as water (H2O), hydrogen fluoride (HF), or ammonia (NH3). The huge electronegativity difference between the H atom (2.1) and the atom to which it is bonded (4.0 for an F atom, 3.5 for an O atom, or 3.0 for an N atom), combined with the very small size of an H atom...
9.1K
Aldehydes and Ketones with Alcohols: Hemiacetal Formation01:19

Aldehydes and Ketones with Alcohols: Hemiacetal Formation

6.8K
Similar to water, alcohols can add to the carbonyl carbon of the aldehydes and ketones. The addition of one molecule of alcohol to the carbonyl compound forms the hemiacetal or half acetal. As depicted below, in a hemiacetal, the carbon is directly linked to an OH and OR group.
6.8K
Vicinal Diols via Reductive Coupling of Aldehydes or Ketones: Pinacol Coupling Overview01:27

Vicinal Diols via Reductive Coupling of Aldehydes or Ketones: Pinacol Coupling Overview

1.8K
Wilhelm Rudolph Fittig discovered the pinacol coupling reaction in 1859. It is a radical dimerization reaction and involves the reductive coupling of aldehydes or ketones in the presence of hydrocarbon solvent to yield vicinal diols.
1.8K
Acid-Catalyzed Dehydration of Alcohols to Alkenes02:35

Acid-Catalyzed Dehydration of Alcohols to Alkenes

20.7K
In a dehydration reaction, a hydroxyl group in an alcohol is eliminated along with the hydrogen from an adjacent carbon. Here, the products are an alkene and a molecule of water. Dehydration of alcohols is generally achieved by heating in the presence of an acid catalyst. While the dehydration of primary alcohols requires high temperatures and acid concentrations, secondary and tertiary alcohols can lose a water molecule under relatively mild conditions.
20.7K
¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

1.9K
The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
1.9K

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Synthesis of Antiviral Tetrahydrocarbazole Derivatives by Photochemical and Acid-catalyzed C-H Functionalization via Intermediate Peroxides CHIPS
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水素結合はアルコールのC−C結合を促進する

Zhuyan Gao1,2, Junju Mu1, Jian Zhang1

  • 1State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian116023, China.

Journal of the American Chemical Society
|October 10, 2022
PubMed
まとめ

水素結合は光触媒の過程で反応性ラジカルを安定させ,持続的な化学生成を促進する. この方法は2,3-ブタニオールのような有価な化学物質を生産するための結合率と選択性を改善します.

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Retropinacol/Cross-pinacol Coupling Reactions - A Catalytic Access to 1,2-Unsymmetrical Diols
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Retropinacol/Cross-pinacol Coupling Reactions - A Catalytic Access to 1,2-Unsymmetrical Diols
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科学分野:

  • 持続可能な化学
  • 光触媒
  • グリーンエネルギー

背景:

  • 光触媒の中間基は高度に反応し,副作用を引き起こす.
  • 化学物質と水素の持続可能な生産には これらの反応性中間物質の制御が必要です

研究 の 目的:

  • 光触媒反応中の中間物質の制御における水素結合の役割を調査する.
  • 光触媒を用いた炭素-炭素結合形成の選択性と効率を高める.

主な方法:

  • エタノール脱水結合のための金とカドミウム硫化物 (Au/CdS) の光触媒を使用した.
  • 触媒の表面と溶液に水素結合を促進するために水を導入します.
  • α-ヒドロキシエチルラジカル (αHR) の行動に対する水素結合の影響を分析した.

主要な成果:

  • 水素結合は,αHRsの酸化と逆反応を抑制した.
  • 水を加えることで αHRの結合率は2. 4倍に増加した.
  • 2,3-ブタニオール (BDO) の選択性は37%から57%に増加した.

結論:

  • 水素結合のような非共性相互作用は 激素反応の経路を導くことができます
  • 水素結合は選択的光触媒と持続可能な化学合成のための戦略を提供します.
  • このアプローチにより 価値ある化学物質と水素エネルギーの生産が促進されます