シンクロトロンVUV光イオン化質量スペクトロメトリと理論的洞察を用いて,ピリジニル基とアクリロニトリルの間の添加,循環,脱水反応を解明する
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PubMedで要約を見る
まとめ
この要約は機械生成です。この研究では,窒素を含むバイサイクル化合物のガス相合成を調査した. オピリジニル基とアクリロニトリルの反応は,標的の1,5-ナフチリジンではなく,リング尾構造を生成した.
科学分野
- 化学運動学
- 天体化学
- 燃焼科学
背景
- 窒素を含むバイサイクル化合物は 恒星間化学と燃焼において極めて重要です
- これらの分子のガス相合成は大きな課題です.
- 合成経路の制御には 根本中性反応の理解が不可欠です
研究 の 目的
- 窒素含有バイサイクル化合物のガス相合成を研究する.
- オピリジニル基とアクリロニトリルの二分子反応を調査する.
- 反応メカニズムを解明し,製品構造を特定する.
主な方法
- 抵抗加熱シリコンカーバイド (SiC) マイクロリアクターが使用されました.
- 分子ビームサンプリングシンクロトロン真空紫外線光イオン化質量スペクトロメトリ (SVUV-PIMS) を採用した.
- 反応メカニズムを分析するために,高レベルのアビニシオ計算を行いました.
主要な成果
- 1100KでC8H6N2種が検出されました.
- リング・テール構造 (3-(2-ピリジニル) -2-プロペニニトリル) の独占的な生産を特定した.
- Ab initio計算では,実験条件下で望ましい1,5-ナフチロイドンの形成が非効率であることが示された.
結論
- オピリジニル基とアクリロニトリルの反応は,主に1,5-ナフチリジンではなく,リング・テイル・プロダクトを生成する.
- 添加,循環,脱水を含む詳細な反応機構が明らかにされた.
- 発見は,窒素を含む芳香化合物の将来のガス相合成戦略を導く.
関連する概念動画
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.
The feasibility of cycloaddition reactions under thermal and photochemical conditions can be...
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...
Radicals, the highly reactive species, gain stability by undergoing three different reactions. The first reaction involves a radical-radical coupling, in which a radical combines with another radical, forming a spin‐paired molecule. The second reaction is between a radical and a spin‐paired molecule, generating a new radical and a new spin‐paired molecule. The third reaction is radical decomposition in a unimolecular reaction, forming a new radical and a spin‐paired...
The molecular ions of cycloalkenes undergo fragmentation via a retro-Diels–Alder reaction.
The reaction proceeds via the cleavage of two carbon-carbon bonds in the cycloalkene to yield ethene. The remaining part of the cycloalkene structure is a dienyl radical cation with a molecular weight of 28 u lower than the molecular ion. This fragmentation pathway is similar to the fragmentation of cycloalkanes releasing ethene, differing only in the resultant radical cation. An alkyl species...
Radical reactions can occur either intermolecularly or intramolecularly. In an intermolecular radical reaction, a nucleophilic radical adds to an electrophilic alkene or vice versa. In such reactions, the radical and generally the alkene, which is also called the radical trap, are two different molecules. Additionally, for such intermolecular reactions to occur, the radical trap must be active, present in an excess concentration, and the radical starting material must have a weak...
Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.
Thermally-induced [2 + 2] cycloadditions are symmetry forbidden. This is because the ground state HOMO of one ethylene molecule and the LUMO of the other ethylene are out of phase, preventing a concerted suprafacial-suprafacial overlap.
Absorption...