HXeCCHの形成の実験的証拠:希少ガス原子を挿入した最初の炭化水素
Vladimir I Feldman1, Fedor F Sukhov, Aleksei Yu Orlov
1Karpov Institute of Physical Chemistry, 10 Vorontsovo Pole Street, Moscow 105064, Russia. feldman@cc.nifhi.ac.ru
Journal of the American Chemical Society
|April 17, 2003
まとめ
研究者は,クセノンマトリックス内のアセチレンを研究することによって,新しい有機分子HXeCCHを発見しました. この分子は,その構造に挿入された希少ガス原子を特徴としており,赤外線スペクトロスコピーで確認されています.
科学分野:
- * 物理化学 物理化学
- * スペクトル顕微鏡検査
- * 無機化学 無機化学
背景:
- * 希少ガスの化合物は化学的に重要な関心があります.
- * 原子が有機分子に挿入される仕組みを理解することは極めて重要です.
- * 過去の研究では,固体マトリックスにおける希少ガス化合物を調査した.
研究 の 目的:
- * 固体クセノンマトリックスにおけるアセチレン放射の産物を研究する.
- *新しい有機稀有ガス種の形成の実験的証拠を提供するため.
- * 新しく形成された分子の構造と結合を特徴付ける.
主な方法:
- * フーリエ変換赤外線 (FTIR) スペクトロスコーピー.
- *電子パラマグネティック共振 (EPR) スペクトロスコピー.
- * アセチレンを固体クセノンマトリックス内の高速電子で照射する.
主要な成果:
- *新しい有機分子であるHXeCCHの形成に関する実験的証拠.
- *XE-Hのストレッチによる1486.0cm(-1) の強烈なIR吸収を特定した.
- *クセノンのH原子とCCHラジカルから形成された新種の特徴.
結論:
- *この研究は,希少ガス原子を挿入した分子であるHXeCCHの形成を確認した.
- *FTIRとEPRの研究は,この新種の有力な特徴を提供する.
- *この発見は,希少ガス化合物と有機分子に関する既知の化学的性質を拡張している.
関連する概念動画
Structure of Alkanes
The formation of carbon-carbon bonds leading to the creation of the carbon chain is the basis of organic chemistry. August Kekulé and Archibald Scott Couper independently developed this idea of carbon chain formation.
Hydrocarbons are the simplest organic compounds composed of carbons and hydrogens. Based on the bond order between carbons, the hydrocarbons are further classified into alkanes, alkenes, and alkynes.
Alkanes are the simplest hydrocarbons with sp3 hybrid carbon atoms. These sp3...
Hydrocarbons are the simplest organic compounds composed of carbons and hydrogens. Based on the bond order between carbons, the hydrocarbons are further classified into alkanes, alkenes, and alkynes.
Alkanes are the simplest hydrocarbons with sp3 hybrid carbon atoms. These sp3...
Formation of Halohydrin from Alkenes
An alkene, such as propene, reacts with bromine in the presence of water to yield a halohydrin. Halohydrins contain a halogen and a hydroxyl group attached to adjacent carbons. When the halogen is bromine, it is called a bromohydrin, while a chlorohydrin has chlorine as the halogen.
Reduction of Alkenes: Catalytic Hydrogenation
Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called catalytic hydrogenation.
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the surface of...
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the surface of...
Electrophilic Addition to Alkynes: Hydrohalogenation
Electrophilic addition of hydrogen halides, HX (X = Cl, Br or I) to alkenes forms alkyl halides as per Markovnikov's rule, where the hydrogen gets added to the less substituted carbon of the double bond. Hydrohalogenation of alkynes takes place in a similar manner, with the first addition of HX forming a vinyl halide and the second giving a geminal dihalide.
Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation
Introduction
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation
Unlike the easy catalytic hydrogenation of an alkene double bond, hydrogenation of a benzene double bond under similar reaction conditions does not take place easily. For example, in the reduction of stilbene, the benzene ring remains unaffected while the alkene bond gets reduced. Hydrogenation of an alkene double bond is exothermic and a favorable process. In contrast, to hydrogenate the first unsaturated bond of benzene, an energy input is needed; that is, the process is endothermic. This is...


