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Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids02:04

Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids

5.7K
Diols are compounds with two hydroxyl groups. In addition to syn dihydroxylation, diols can also be synthesized through the process of anti dihydroxylation. The process involves treating an alkene with a peroxycarboxylic acid to form an epoxide. Epoxides are highly strained three-membered rings with oxygen and two carbons occupying the corners of an equilateral triangle. This step is followed by ring-opening of the epoxide in the presence of an aqueous acid to give a trans diol.
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Ziegler–Natta Chain-Growth Polymerization: Overview01:17

Ziegler–Natta Chain-Growth Polymerization: Overview

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Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
3.2K
Nucleophilic Addition to the Carbonyl Group: General Mechanism01:18

Nucleophilic Addition to the Carbonyl Group: General Mechanism

5.2K
The carbonyl carbon in an aldehyde or ketone is the site of a nucleophilic attack due to its electron-deficient nature. Depending on the strength of the incoming nucleophile, the reaction occurs via different mechanistic pathways.
A stronger nucleophile can directly attack the electrophilic center, the carbonyl carbon. The HOMO orbital of the nucleophile interacts with the LUMO (π* antibonding) orbital present on the carbonyl carbon. This interaction breaks the π bond and shifts the...
5.2K
Cycloaddition Reactions: Overview01:16

Cycloaddition Reactions: Overview

2.5K
Cycloadditions are one of the most valuable and effective synthesis routes to form cyclic compounds. These are concerted pericyclic reactions between two unsaturated compounds resulting in a cyclic product with two new σ bonds formed at the expense of π bonds. The [4 + 2] cycloaddition, known as the Diels–Alder reaction, is the most common. The other example is a [2 + 2] cycloaddition.
2.5K
Radical Formation: Addition00:47

Radical Formation: Addition

1.7K
Radicals can be formed by adding a radical to a spin-paired molecule. This is typically observed with unsaturated species, where the addition of a radical across the π bond leads to the production of a new radical by dissolving the π bond. For example, the addition of a Br radical to an alkene yields a carbon-centered radical.
Similar to charge conservation in chemical reactions, spin conservation is implicit for radical reactions. Accordingly, the product formed must possess an...
1.7K
Radical Anti-Markovnikov Addition to Alkenes: Mechanism01:17

Radical Anti-Markovnikov Addition to Alkenes: Mechanism

3.7K
The reaction of hydrogen bromide with alkenes in the presence of hydroperoxides or peroxides proceeds via anti-Markovnikov addition. The radical chain reaction comprises initiation, propagation, and termination steps.
The mechanism starts with chain initiation, which involves two steps. In the first chain initiation step, a weak peroxide bond is homolytically cleaved upon mild heating to form two alkoxy radicals. In the second initiation step, a hydrogen atom is abstracted by the alkoxy...
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Controlled Photoredox Ring-Opening Polymerization of O-Carboxyanhydrides Mediated by Ni/Zn Complexes
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後期段階 C ((sp2) -C ((sp3) ニッケル酸化添加複合体による多様化

Carlota Odena1,2, Tomás G Santiago1, María Lourdes Linares3

  • 1Institute of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology, Avenida Països Catalans 16, 43007 Tarragona, Spain.

Journal of the American Chemical Society
|July 25, 2024
PubMed
まとめ

ニッケル酸化添加複合体 (Ni-OAC) は,薬剤発見のための新しいプラットフォームを提供します. このアプローチは,設計・製造・テスト・分析のサイクルを加速させ,強化されたC ((sp3) 分子を有するリード候補を迅速に生成します.

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Efficient Synthesis of All-Carbon Quaternary Centers via the Conjugate Addition of Functionalized Monoorganozinc Bromides
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Efficient Synthesis of All-Carbon Quaternary Centers via the Conjugate Addition of Functionalized Monoorganozinc Bromides
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Mizoroki-Heck Cross-coupling Reactions Catalyzed by Dichloro{bis[1,1',1''-phosphinetriyltripiperidine]}palladium Under Mild Reaction Conditions
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Mizoroki-Heck Cross-coupling Reactions Catalyzed by Dichloro{bis[1,1',1''-phosphinetriyltripiperidine]}palladium Under Mild Reaction Conditions

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科学分野:

  • 有機化学
  • 薬剤化学
  • カタリシス

背景:

  • 薬の発見は,特に高いC ((sp3) 分数を持つ新しい化学領域へのアクセスでしばしば課題に直面します.
  • 伝統的なニッケル触媒反応は範囲が限定され,特殊なリガンドを必要とします.

研究 の 目的:

  • ニッケル酸化添加複合体 (Ni-OAC) を迅速な鉛候補生成のための多用途プラットフォームとして導入する.
  • C ((sp2) - C ((sp3) カップリングを超えた新しい化学領域へのアクセスにおけるNi-OACの潜在能力を探求する.
  • 薬の発見を加速させるための 自動化された多様化プロセスの実証です

主な方法:

  • 薬のような分子から派生したNi-OACの合成と特徴付け.
  • C ((sp2) - C ((sp3) カップリングを含む様々な結合形成反応におけるNi-OACの評価.
  • 自動化された多様化ワークフローの開発と実装

主要な成果:

  • Ni-OACは,強化されたC ((sp3) 分数の鉛候補の急速な生成を可能にします.
  • Ni-OACは,従来のNi-触媒化された方法を上回る,多様な結合形成において広範な適用性を示しています.
  • 自動化された多様化プロセスは,Ni-OACプラットフォームの強さと効率性を強調しています.

結論:

  • Ni-OACは,新しい化学実体にアクセスするための強力で一般化可能な戦略を提供します.
  • このプラットフォームは 薬剤開発における 設計・製造・試験・分析 (DMTA) サイクルを大幅に加速します
  • Ni-OACは医薬品化学と鉛の最適化のための有望な新しいゲートウェイを表しています.