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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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Updated: May 13, 2026

Microdissection of Mouse Brain into Functionally and Anatomically Different Regions
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発達中のマウスの脳の分子構造

Gioele La Manno1,2, Kimberly Siletti3, Alessandro Furlan3,4

  • 1Division of Molecular Neurobiology, Department of Medical Biochemistry and Biophysics, Karolinska Institute, Stockholm, Sweden. gioele.lamanno@epfl.ch.

Nature
|July 29, 2021
PubMed
まとめ

研究者はマウスの胚性脳の 総合的な分子アトラスを作成し 約800の細胞状態を特定し 遺伝子の発現をマッピングし 胃形成から出生までの脳の発達を理解しました

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科学分野:

  • 神経科学
  • 発達生物学
  • ゲノミクス

背景:

  • 哺乳類の脳の発達には 空間的シグナル,細胞信号,遺伝的プログラムが 複雑に絡み合って 千種類以上の 異なる細胞が生まれます
  • このプロセスを理解するには,空間時間的な発達範囲全体にわたる細胞状態の体系的な特徴づけが必要です.
  • 単細胞RNAシーケンシングと空間トランスクリプトミックは,神経系における分子異質性を明らかにする強力なツールです.

研究 の 目的:

  • ネズミの胚の 単細胞のトランスクリプトミックの アトラスを作成する
  • 胚の脳発達中の細胞状態を特定し特徴づけること
  • 重要な発達遺伝子の空間表現パターンをマッピングし,単細胞データと統合する.

主な方法:

  • ガストルレーションから誕生までのマウス胚の単細胞RNA配列解析
  • 局所的な遺伝子発現パターンを決定する mRNA 配列解析
  • 単細胞のトランスクリプトミックのデータと空間表現データの統合

主要な成果:

  • 胚性マウスの脳の発達過程で800の異なる細胞状態を特定した.
  • 神経上皮質,二次組織体,原始細胞を含む脳の機能要素の発達プログラムの特徴化.
  • 統合データ分析による神経系パターニング中の神経原体の空間的組織の正確なマッピング.

結論:

  • この研究は,マウスの胚性脳の発達に関する詳細な分子アトラスを提供しています.
  • この発見は,神経原体の発達軌跡と空間的組織を明らかにしています.
  • 哺乳類の脳の形成と 細胞の多様性に関する理解を深めるでしょう