アミンを含んだ中性三座標有機ボロンアイソエレクトロニックの合成と特徴付け
Rei Kinjo1, Bruno Donnadieu, Mehmet Ali Celik
1UCR-CNRS Joint Research Chemistry Laboratory (UMI 2957), Department of Chemistry, University of California Riverside (UCR), Riverside, CA 92521-0403, USA.
まとめ
研究者らは,ルイス基として作用する中性ボロン化合物を合成した. この化合物は酸化され,激素カチオンを形成することができ,ボロンの化学と電子特性に関する新しい洞察を提供します.
科学分野:
- 有機金属化学 有機金属化学
- カルベンの化学反応
- ボロン化学 ボロン化学
背景:
- アミンとボランは,それぞれ,古典的なルイス基と酸である.
- アミンの1電子酸化により,急性カチオンが生み出され,ボランは急性アニオンに還元される.
- 安定したボリレンとボリニリウムイオンは希少で,合成的に難しい.
研究 の 目的:
- ルイス塩基として機能する中性三座標ボロン化合物を合成する.
- この新型ボロン化合物の1電子酸化を調査するために.
- 結果となる根幹の電子構造を特徴づける.
主な方法:
- サイクル (アルキル) ・アミノ) 炭基で安定した中性三座標ボロン誘導体の合成.
- 合成されたボロン化合物の1電子酸化.
- Ab initio 分子軌道を分析するための計算計算.
主要な成果:
- ルイス基本性を示す中性三座標ボロン化合物の合成に成功した.
- この化合物は,容易に1電子の酸化を経て,安定した根幹カチオンを形成する.
- 計算分析により,ボロンp (π) 軌道が中性カチオンと急性カチオンの両方の電子構造の鍵であることを明らかにした.
結論:
- 合成されたボロン化合物は,安定したルイス塩基として機能し,その根幹カチオンに酸化することができます.
- これらの発見は,安定した親ボリレンおよびボリニリウム種へのアクセスを提供します.
- 電子的性質は,ボロンp (π) 軌道によって支配され,ボロン基の化学に関する基本的な洞察を提供します.
関連する概念動画
Structural Isomerism
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can be...
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can be...
Preparation of Amines: Reductive Amination of Aldehydes and Ketones
Carbonyl compounds and primary amines undergo reductive amination first to produce imines, followed by secondary amines in the same reaction mixture, using selective reducing agents like sodium cyanoborohydride or sodium triacetoxyborohydride. Reductive amination produces different degrees of substitution of amines depending on the starting amine substrate.
Structure of Amines
The hybridized nitrogen atom in amines possesses a lone pair of electrons and is bound to three substituents with a bond angle of around 108°, which is less than the tetrahedral angle of 109.5°. However, the C–N–H bond angle is slightly larger at 112°, with a carbon–nitrogen bond length of 147 pm. This carbon–nitrogen bond length of of amines is longer than the carbon–oxygen bond of alcohols (143 pm) but shorter than alkanes’ carbon–carbon bond (154 pm). These aspects are illustrated in Figure...
Amines to Amides: Acylation of Amines
Various carboxylic acid derivatives (such as acid chlorides, esters, and anhydrides) can be used for the acylation of amines to yield amides. The reaction requires two equivalents of amines. The first amine molecule functions as a nucleophile and attacks the carbonyl carbon to produce a tetrahedral intermediate. This is followed by the loss of the leaving group and restoration of the C=O bond.
Next, the second equivalent of amine serves as a Brønsted base and deprotonates the quaternary amide...
Next, the second equivalent of amine serves as a Brønsted base and deprotonates the quaternary amide...
1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Mechanism
Nitrous acid is a relatively weak and unstable acid prepared in situ by the reaction of sodium nitrite and cold, dilute hydrochloric acid. In an acidic solution, the nitrous acid undergoes protonation when it loses water to form a nitrosonium ion—an electrophile. Nitrous acid reacts with primary amines to give diazonium salts. The reaction is called diazotization of primary amines.
1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Overview
Nitrous acid and nitric acids are two types of acids containing nitrogen, among which nitrous acid is weaker than nitric acid. Nitrous acid with a pKa value of 3.37 ionizes in water to give a nitrite ion and the hydronium ion.
The nitrous acid is unstable. Hence, it is formed in situ from a solution of sodium nitrite and cold aqueous acids such as hydrochloric or sulfuric acid. In an acidic solution, the –OH group of nitrous acid undergoes protonation to give oxonium ion, followed by water loss...
The nitrous acid is unstable. Hence, it is formed in situ from a solution of sodium nitrite and cold aqueous acids such as hydrochloric or sulfuric acid. In an acidic solution, the –OH group of nitrous acid undergoes protonation to give oxonium ion, followed by water loss...


