関連する実験動画
Updated: Jan 25, 2026

08:05
Staining the Cytoplasmic Ca2+ with Fluo-4/AM in Apple Pulp
Published on: November 6, 2021
5.1K
(4+1) vs (4+2): C-C アクティベーションによるサイクロブタノンと三置換アレン間の触媒内結合
1Department of Chemistry, University of Texas at Austin , Austin, Texas 78712, United States.
Journal of the American Chemical Society
|October 7, 2015
まとめ
新しいロジウム触媒反応により,単純なサイクロブタノンとアレンから複雑な[4.2.1]-バイサイクル分子が生成される. この方法は,高エナチオ選択性を持つ2つの四次炭素センターを効率的に構築し,多用途の合成経路を提供します.
科学分野:
- 有機化学
- カタリシス
- 合成方法論
背景:
- サイクロブタノンとアレンは一般的な有機構成要素です.
- 複雑な多循環構造の構築のための効率的な方法の開発は,有機合成において極めて重要です.
研究 の 目的:
- 新しいロジウム触媒 (4+1) サイクル反応を開発する.
- [4.2.1]二輪性化合物を四次炭素中心で合成する.
- サイクル化過程で高いエナチオ選択性を達成する.
主な方法:
- サイクロブタノンとアレン間のロジウム触媒 (4+1) サイクル添加.
- TADDOL由来フォスフォラミドイトリガンドを非対称な触媒として使用する.
- サイクロブタノンのC-C活性化を用いる.
主要な成果:
- [4.2.1]-二回転骨格の合成が成功し,2つの四次炭素センターができました.
- 多様な機能群に対する耐性を示す.
- 多様なポリサイクリック・スキャファッドを利用できます
- キラル・フォスフォラミドイト・リガンドを用いて優れたエナンチオセレクティブ性を達成した.
結論:
- 開発されたロジウム触媒 (4+1) サイクリングは,複雑なバイサイクルの構造を構築するための効果的な方法である.
- この反応は,高ステレオ制御の有価なポリサイクル・スキャフォールドへのアクセスを提供します.
- 結果として得られる製品は,さらなる合成加工に適しています.
関連する概念動画
Criteria for Aromaticity and the Hückel 4n + 2 Rule
13.0K
Like benzene, cyclobutadiene and cyclooctatetraene are cyclic compounds with alternate single and double bonds. However, their chemical behavior differs from benzene, as they are unstable and not aromatic. So, what are the structural characteristics of unsaturated compounds categorized as aromatic?
For the first time, Eric Hückel, a German chemical physicist, derived a set of structural features for a compound to be classified as aromatic. This is now known as Hückel’s rule or the 4n +...
For the first time, Eric Hückel, a German chemical physicist, derived a set of structural features for a compound to be classified as aromatic. This is now known as Hückel’s rule or the 4n +...
13.0K
[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction
12.2K
The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.
12.2K
Dipeptidyl Peptidase 4 Inhibitors
622
Dipeptidyl peptidase 4 (DPP-4) is a serine protease widely distributed in the body. It's involved in the inactivation of GLP-1 and GIP hormones, which are crucial for insulin regulation. DPP-4 inhibitors, such as sitagliptin (Januvia), saxagliptin (Onglyza), linagliptin (Tradjenta), alogliptin (Nesina), and vildagliptin (Galvus), help increase the proportion of active GLP-1, enhancing insulin secretion. These inhibitors work by competitively binding to DPP-4. This binding causes a...
622
Intermolecular vs Intramolecular Forces
96.4K
Intermolecular forces (IMF) are electrostatic attractions arising from charge-charge interactions between molecules. The strength of the intermolecular force is influenced by the distance of separation between molecules. The forces significantly affect the interactions in solids and liquids, where the molecules are close together. In gases, IMFs become important only under high-pressure conditions (due to the proximity of gas molecules). Intermolecular forces dictate the physical properties of...
96.4K
Piaget's Stage 4 of Cognitive Development
611
The formal operational stage, as described in Piaget's cognitive development theory, begins around age 11 and extends into adulthood. It marks the emergence of advanced cognitive abilities that differentiate adolescent and adult thinking from those of younger children. This stage is characterized by abstract reasoning, hypothetical-deductive reasoning, and a more complex understanding of self and others.
Abstract Reasoning and Hypothetical-Deductive Thinking
Unlike the concrete operational...
Abstract Reasoning and Hypothetical-Deductive Thinking
Unlike the concrete operational...
611
Amides to Amines: LiAlH4 Reduction
6.3K
Amide reduction with strong reducing agents like lithium aluminum hydride proceeds through a nucleophilic acyl substitution to form amines. Primary, secondary, and tertiary amides yield primary, secondary, and tertiary amines, respectively.
Amide reduction requires two equivalents of the reducing agent, acting as a source of hydride ions. As shown in the figure, the reaction is initiated with a nucleophilic attack by the hydride ion at the carbonyl carbon to form a tetrahedral intermediate.
Amide reduction requires two equivalents of the reducing agent, acting as a source of hydride ions. As shown in the figure, the reaction is initiated with a nucleophilic attack by the hydride ion at the carbonyl carbon to form a tetrahedral intermediate.
6.3K

![Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F60786.jpg&w=3840&q=50)