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Aromatic Hydrocarbon Cations: Structural Overview

Aromatic Hydrocarbon Cations: Structural Overview

Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group...

Diazonium Group Substitution: –OH and –H

Diazonium Group Substitution: –OH and –H

Nitrous acid, a weak acid, is prepared in situ via the reaction of sodium nitrite with a strong acid under cold conditions. This nitrous acid prepared in situ reacts with primary arylamines to form arenediazonium salts. Such reactions are known as diazotization reactions. As shown in Figure 1, the formation of arenediazonium salts begins with the decomposition of nitrous acid in an acidic solution to give nitrosonium ions.

Diazonium Group Substitution with Halogens and Cyanide: Sandmeyer and Schiemann Reactions

Diazonium Group Substitution with Halogens and Cyanide: Sandmeyer and Schiemann Reactions

Arenediazonium substitution reactions occur when the diazonium group is substituted by various functional groups such as halides, hydroxyl, nitrile, etc. For instance, arenediazonium salts react with copper(I) salts of chloride, bromide, or cyanide to form corresponding aryl chlorides, bromides, and nitriles. These reactions are named Sandmeyer reactions. Although the mechanism of this reaction is complicated, as illustrated in Figure 1, they are believed to progress via an aryl copper...

Stability of Conjugated Dienes

Stability of Conjugated Dienes

Introduction
A comparison of the enthalpies of hydrogenation of dienes reveals that conjugated dienes release less heat on hydrogenation, rendering them more stable than their nonconjugated analogs.

Structure of Conjugated Dienes

Structure of Conjugated Dienes

Introduction
Conjugated dienes are compounds characterized by the presence of alternating double and single bonds. In a conjugated system like 1,3-butadiene, the unhybridized 2p orbital on each carbon overlaps continuously, allowing the π electrons to be delocalized across the entire molecule. In contrast, this type of overlap does not occur in cumulated and isolated dienes, such as 2,3-pentadiene and 1,4-pentadiene, respectively. Instead, the π electrons remain localized between the...

Aryldiazonium Salts to Azo Dyes: Diazo Coupling

Aryldiazonium Salts to Azo Dyes: Diazo Coupling

The reaction of weakly electrophilic aryldiazonium (also called arenediazonium) salts with highly activated aromatic compounds leads to the formation of products with an —N=N— link, called an azo linkage. This reaction, presented in Figure 1, is known as diazo coupling and occurs without the loss of the nitrogen atoms of the aryldiazonium salt. Highly activated aromatic compounds such as phenols or arylamines favor the diazo coupling reaction. The coupling generally occurs at the...

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Updated: Apr 22, 2026

Modification and Functionalization of the Guanidine Group by Tailor-made Precursors

Modification and Functionalization of the Guanidine Group by Tailor-made Precursors

Published on: April 27, 2017

持久性ダイザヘプタセンの誘導体である.

Jens U Engelhart¹, Olena Tverskoy, Uwe H F Bunz

¹Organisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg , Im Neuenheimer Feld 270, 69120 Heidelberg, Germany.

Journal of the American Chemical Society

|October 9, 2014

まとめ

この要約は機械生成です。

研究者らは,大量のシリル保護基を用いて,安定したディアザヘプタセンの誘導体を合成した. これらのグループは二分化を防止し,これらの複雑な有機分子を特徴づけることができます.

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Continuous Flow Chemistry: Reaction of Diphenyldiazomethane with p-Nitrobenzoic Acid

Continuous Flow Chemistry: Reaction of Diphenyldiazomethane with p-Nitrobenzoic Acid

Published on: November 15, 2017

Synthesis of Antiviral Tetrahydrocarbazole Derivatives by Photochemical and Acid-catalyzed C-H Functionalization via Intermediate Peroxides CHIPS

Synthesis of Antiviral Tetrahydrocarbazole Derivatives by Photochemical and Acid-catalyzed C-H Functionalization via Intermediate Peroxides CHIPS

Published on: June 20, 2014

関連する実験動画

Last Updated: Apr 22, 2026

Modification and Functionalization of the Guanidine Group by Tailor-made Precursors

Modification and Functionalization of the Guanidine Group by Tailor-made Precursors

Published on: April 27, 2017

Continuous Flow Chemistry: Reaction of Diphenyldiazomethane with p-Nitrobenzoic Acid

Continuous Flow Chemistry: Reaction of Diphenyldiazomethane with p-Nitrobenzoic Acid

Published on: November 15, 2017

Synthesis of Antiviral Tetrahydrocarbazole Derivatives by Photochemical and Acid-catalyzed C-H Functionalization via Intermediate Peroxides CHIPS

Synthesis of Antiviral Tetrahydrocarbazole Derivatives by Photochemical and Acid-catalyzed C-H Functionalization via Intermediate Peroxides CHIPS

Published on: June 20, 2014

科学分野:

有機化学オーガニック・ケミストリー
マテリアルサイエンス材料科学

背景:

ディアザヘプタセンは複雑なポリサイクル芳香炭化水素で,有機電子機器の潜在的応用がある.
保護されていないディアザヘプタセンは,ダイエルス・アルダー反応による二分化に容易になり,その分離と特徴付けを妨げます.

研究の目的:

新しいダイザヘプタセンの誘導体を合成し,特徴づけること.
ダイメリゼーションを防止し,隔離を可能にする効果的な保護群を特定する.

主な方法:

ディアザヘプタセン核の合成.
シリエチニル保護基の結合. シリエチニル保護基の結合.
核磁共振 (NMR) とUV-Visスペクトロスコピーを用いて特徴づけました.
サイクルボルトメトリーを用いた電気化学分析.

主要な成果:

ディアザヘプタセンの誘導体が成功して合成されました.
トライソプロピルシリル (TIPS) -エチニルグループは安定化には不十分でした.
4つのシリコン ((セク-ブチル) 3-エチニル基は,効果的なステリック保護を提供し,ディエルス-アルダー二分化を防止しました.
保護されたダイアザヘプタケネスは分離可能であり,特徴づけられた.

結論:

大量のシリル保護群は,ディアザヘプタセンの分離と特徴づけに不可欠である.
開発された合成戦略により,さらなる研究のために安定したディアザヘプタセンの誘導体へのアクセスを可能にします.