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関連する概念動画

Hydroboration-Oxidation of Alkenes03:08

Hydroboration-Oxidation of Alkenes

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.
Preparation of Alcohols via Addition Reactions02:15

Preparation of Alcohols via Addition Reactions

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...
Acid-Catalyzed Dehydration of Alcohols to Alkenes02:35

Acid-Catalyzed Dehydration of Alcohols to Alkenes

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.
Oxidation of Alcohols02:37

Oxidation of Alcohols

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:
Preparation of Aldehydes and Ketones from Alcohols, Alkenes, and Alkynes01:33

Preparation of Aldehydes and Ketones from Alcohols, Alkenes, and Alkynes

Aldehydes and ketones are prepared from alcohols, alkenes, and alkynes via different reaction pathways. Alcohols are the most commonly used substrates for synthesizing aldehydes and ketones. The conversion of alcohol to aldehyde, which involves the oxidation process, depends on the class of the alcohol used and the strength of the oxidizing agent. For instance, primary alcohol will form an aldehyde when treated with a weak oxidizing agent; however, it gets over-oxidized to a carboxylic acid in...
Reactions of Aldehydes and Ketones: Baeyer–Villiger Oxidation01:22

Reactions of Aldehydes and Ketones: Baeyer–Villiger Oxidation

Baeyer–Villiger oxidation converts aldehydes to carboxylic acids and ketones to esters. The reaction uses peroxy acids or peracids and is often catalyzed by acid. The reaction is named after its pioneers, Adolf von Baeyer and Victor Villiger. The reaction is achieved by a wide range of peracids such as m-chloroperoxybenzoic acid (mCPBA), perbenzoic acid (C6H5COOOH), peracetic acid (CH3COOOH), hydrogen peroxide (H2O2), and tert-butyl hydroperoxide (t-BuOOH).
The carbonyl center is activated by...

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関連する実験動画

Updated: May 13, 2026

Temperature-programmed Deoxygenation of Acetic Acid on Molybdenum Carbide Catalysts
08:15

Temperature-programmed Deoxygenation of Acetic Acid on Molybdenum Carbide Catalysts

Published on: February 7, 2017

毛孔液の流れによって引き起こされる余震?

A Nur, J R Booker

    Science (New York, N.Y.)
    |February 25, 1972
    PubMed
    まとめ

    大規模な地震は,液体の孔圧を変化させ,岩石を弱め,潜在的に遅れた骨折を引き起こします. この流体フローメカニズムは,大地震の後の余震活動のタイミングを説明する.

    科学分野:

    • 地質物理学 地質物理学とは地質物理学です.
    • 地震学 地震学とは
    • ロック・メカニクス ロック・メカニクス

    背景:

    • 大規模な浅い地震は,地殻のストレスと流体システムに大きな影響を与えます.
    • 液体の孔圧の変化は,岩石の強さや崩壊に重要な役割を果たします.
    • 余震の配列は,メインショックのイベント後のダイナミックなプロセスについての洞察を提供します.

    研究 の 目的:

    • 地震の余震発生における液体孔圧の変化の役割を調査する.
    • 大規模な地震後の流体流によって引き起こされる遅れた骨折のメカニズムを探求する.
    • 孔圧衰退の理論モデルと観測された余震率を比較する.

    主な方法:

    • 大規模な地震によって誘発される流体孔圧の変化のモデリング.
    • 地殻内の流体流れと再分配プロセスの分析.
    • 計算された孔圧衰退率と観測された余震データとの比較.

    主要な成果:

    • 地震は,ストレスドロップに匹敵する液体の孔圧の変化を誘発します.
    • 流体の流れは,孔圧の緩やかな再分配につながり,岩石の強さを低下させます.
    • 孔圧衰退の計算速度は,観測された余震速率とよく一致しています.

    さらに関連する動画

    Simultaneous Multi-surface Anodizations and Stair-like Reverse Biases Detachment of Anodic Aluminum Oxides in Sulfuric and Oxalic Acid Electrolyte
    10:27

    Simultaneous Multi-surface Anodizations and Stair-like Reverse Biases Detachment of Anodic Aluminum Oxides in Sulfuric and Oxalic Acid Electrolyte

    Published on: October 5, 2017

    Separation of Aldehydes and Reactive Ketones from Mixtures Using a Bisulfite Extraction Protocol
    09:08

    Separation of Aldehydes and Reactive Ketones from Mixtures Using a Bisulfite Extraction Protocol

    Published on: April 2, 2018

    関連する実験動画

    Last Updated: May 13, 2026

    Temperature-programmed Deoxygenation of Acetic Acid on Molybdenum Carbide Catalysts
    08:15

    Temperature-programmed Deoxygenation of Acetic Acid on Molybdenum Carbide Catalysts

    Published on: February 7, 2017

    Simultaneous Multi-surface Anodizations and Stair-like Reverse Biases Detachment of Anodic Aluminum Oxides in Sulfuric and Oxalic Acid Electrolyte
    10:27

    Simultaneous Multi-surface Anodizations and Stair-like Reverse Biases Detachment of Anodic Aluminum Oxides in Sulfuric and Oxalic Acid Electrolyte

    Published on: October 5, 2017

    Separation of Aldehydes and Reactive Ketones from Mixtures Using a Bisulfite Extraction Protocol
    09:08

    Separation of Aldehydes and Reactive Ketones from Mixtures Using a Bisulfite Extraction Protocol

    Published on: April 2, 2018

    結論:

    • 液体の孔圧の変化とその後の再分布は,余震発生のための有効なメカニズムです.
    • 流体の流れによる遅れた骨折は,大規模な地震の重要な結果です.
    • 提案されたメカニズムは,余震活動の時間的な衰退について説得力のある説明を提供します.