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関連する概念動画

Heterogeneous Catalysis01:22

Heterogeneous Catalysis

48
Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...
48
Hydroboration-Oxidation of Alkenes03:08

Hydroboration-Oxidation of Alkenes

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In addition to the oxymercuration–demercuration method, which converts the alkenes to alcohols with Markovnikov orientation, a complementary hydroboration-oxidation method yields the anti-Markovnikov product. The hydroboration reaction, discovered in 1959 by H.C. Brown, involves the addition of a B–H bond of borane to an alkene giving an organoborane intermediate. The oxidation of this intermediate with basic hydrogen peroxide forms an alcohol.
11.9K
Cycloaddition Reactions: MO Requirements for Photochemical Activation01:12

Cycloaddition Reactions: MO Requirements for Photochemical Activation

2.8K
Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.
2.8K
Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

2.4K
The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
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Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide02:44

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

13.2K
Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
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Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation02:47

Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation

21.7K
Introduction
One of the convenient methods for the preparation of aldehydes and ketones is via hydration of alkynes. Hydroboration-oxidation of alkynes is an indirect hydration reaction in which an alkyne is treated with borane followed by oxidation with alkaline peroxide to form an enol that rapidly converts into an aldehyde or a ketone. Terminal alkynes form aldehydes, whereas internal alkynes give ketones as the final product.
21.7K

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Al ((2) O ((3) 光触媒的有機変換のための表面複合

Wan Ru Leow1, Wilson Kwok Hung Ng2, Tai Peng1

  • 1Innovative Center for Flexible Devices, School of Materials Science and Engineering, Nanyang Technological University , 50 Nanyang Avenue, Singapore 639798.

Journal of the American Chemical Society
|December 15, 2016
PubMed
まとめ

地球に豊富に存在する酸化アルミニウム (Al2O3) は,ベンジルアルコールの選択的光酸化を促進する. これは表面複合によって生じ,より緑の有機合成のための反応物質を活性化します.

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Analyzing the Photo-oxidation of 2-propanol at Indoor Air Level Concentrations Using Field Asymmetric Ion Mobility Spectrometry
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科学分野:

  • 緑の化学と持続可能な有機合成
  • 光触媒と表面化学について

背景:

  • 太陽光による有機反応は 持続可能な合成戦略です
  • アルミニウム酸化物 (Al2O3) は,典型的には断熱剤であり,未知の触媒的可能性を持っています.

研究 の 目的:

  • 太陽光による選択的光酸化反応におけるAl2O3の触媒的役割を調査する.
  • 光触媒におけるAl2O3の活性化メカニズムを解明する.

主な方法:

  • Al2O3を様々な染料と酸素で触媒として使用して,ベンジルアルコールを光酸化する.
  • 表面の複雑化と電子効果を理解するために

主要な成果:

  • Al2O3は,太陽光下でのベンジルアルコールの選択的光酸化を著しく促進した.
  • ベンジルアルコールとAl2O3の表面複合は酸化可能性を低下させた.
  • Al2O3は,光刺激された染料から電子移転のための酸素活性化を促進した.

結論:

  • Al2O3は,表面複合によって反応物質を活性化することで,効果的な光触媒として作用する.
  • このメカニズムは,光還元反応で土に豊富な材料を活用するための新しいアプローチを提供します.
  • この発見は 可視光を用いた持続可能な有機合成の 新たな道を開きます