Ru(2) S(2) 複合体におけるヒドロキシル置換アルケーンおよびアルキンの脱水反応
Kazuko Matsumoto1, Yoshihiro Moriya, Hiroyasu Sugiyama
1Department of Chemistry, School of Science and Engineering, and Advanced Research Institute of Science and Engineering, Waseda University and Japan Science and Technology Corporation, 3-4-1 Ohkubo, Shinjuku, Tokyo 169-8555, Japan. kmatsu@waseda.jp
Journal of the American Chemical Society
|October 31, 2002
まとめ
ルテニウム複合体は,ヒドロキシル置換アルケンおよびアルキンと反応し,脱水し,新しいC-S環構造を形成します. この研究では,様々な有機金属複合体を産生する分子間および分子内反応を調査しています.
科学分野:
- 有機金属化学 有機金属化学
- 協調化化学について
- 合成化学 合成化学とは
背景:
- ルテニウム複合体は,有機合成における汎用的な触媒である.
- 脱水反応は,新しい化学結合と循環構造の形成に不可欠です.
- 硫黄を含むルテニウム複合体の反応性を理解することは,新しい合成方法論の開発に不可欠です.
研究 の 目的:
- 特定のルテニウム複合体,[[Ru(P(OCH(3)) ((3)) ((2) (((CH(3) CN) ((3)) ((2) (((mu-S(2)) (((CF ((3) (((SO(3)) ((4))) の反応を調査するために,様々なヒドロキシル置換アルケーンおよびアルキーン.
- これらの反応における分子間および分子内脱水のメカニズムを解明する.
- 新しいルテニウムを含む循環複合体を合成し,特徴づけること.
主な方法:
- 複合体1がアルリルアルコール,3-ブテン-1-オール,2-プロピン-1-オール,2-ブチン-1-オール,および様々なダイオールと反応する.
- スペクトロスコーピテクニックを用いた中間および最終製品の分離と特徴付け.
- C-H結合の活性化と脱水を含む反応経路の分析.
主要な成果:
- 分子間脱水とアルリルアルコールによるC-H活性化によるC(3) S(2) 五連鎖環複合体の形成 (2).
- 3ブーテン-1-オールによる分子内脱水によるC(4) S(2) 六環複合体 (3) の合成.
- プロパルギルアルコールとの反応によるホモカップリングおよびクロスカップリング製品 (4-7) の生成は,分子間脱水を含む.
- ディオールとメトキシ置換アルキンとの反応によるフリル複合体 (8-9) およびその他のユニークな構造体 (10-11) の形成,多様な脱水とS-S結合分裂経路を示す.
結論:
- ルテニウム複合体1は,不飽和アルコールによる分子間および分子内脱水反応を効果的に媒介する.
- この研究は,多様な周期性有機金属構造の形成を実証し,合成化学におけるこのルテニウム複合体の有用性を強調しています.
- 観察された反応は,C-S結合形成,C-H活性化,およびルテニウムを含む新しいサイクル化戦略についての洞察を提供します.
関連する概念動画
Rate-Determining Steps
Relating Reaction Mechanisms
In a multistep reaction mechanism, one of the elementary steps progresses significantly slower than the others. This slowest step is called the rate-limiting step (or rate-determining step). A reaction cannot proceed faster than its slowest step, and hence, the rate-determining step limits the overall reaction rate.
The concept of rate-determining step can be understood from the analogy of a 4-lane freeway with a short-stretch of traffic-bottleneck caused due to...
In a multistep reaction mechanism, one of the elementary steps progresses significantly slower than the others. This slowest step is called the rate-limiting step (or rate-determining step). A reaction cannot proceed faster than its slowest step, and hence, the rate-determining step limits the overall reaction rate.
The concept of rate-determining step can be understood from the analogy of a 4-lane freeway with a short-stretch of traffic-bottleneck caused due to...
Bronsted-Lowry Acids and Bases
The acid-base reaction class has been studied for quite some time. In 1680, Robert Boyle reported traits of acid solutions that included their ability to dissolve many substances, to change the colors of certain natural dyes, and to lose these traits after coming in contact with alkali (base) solutions. In the eighteenth century, it was recognized that acids have a sour taste, react with limestone to liberate a gaseous substance (now known to be CO2), and interact with alkalis to form neutral...
Water: A Bronsted-Lowry Acid and Base
The reaction between a Brønsted-Lowry acid and water is called acid ionization. For example, when hydrogen fluoride dissolves in water and ionizes, protons are transferred from hydrogen fluoride molecules to water molecules, yielding hydronium ions and fluoride ions:
Lewis Acids and Bases
In 1923, G. N. Lewis proposed a generalized definition of acid-base behavior in which acids and bases are identified by their ability to accept or to donate a pair of electrons and form a coordinate covalent bond.
A coordinate covalent bond (or dative bond) occurs when one of the atoms in the bond provides both bonding electrons. For example, a coordinate covalent bond occurs when a water molecule combines with a hydrogen ion to form a hydronium ion. A coordinate covalent bond also results when...
A coordinate covalent bond (or dative bond) occurs when one of the atoms in the bond provides both bonding electrons. For example, a coordinate covalent bond occurs when a water molecule combines with a hydrogen ion to form a hydronium ion. A coordinate covalent bond also results when...
Lewis Acids and Bases
This lesson delves into Lewis acids and bases in the context of the octet rule for electron-deficient compounds. Here, the concept is discussed, emphasizing the group 13 elements like boron or aluminium. Since group 13 elements possess three valence electrons, they form trivalent compounds with a sextet of electrons and a vacant orbital for the central atom. Consequently, these electron-deficient compounds accept electrons from other species to complete their octet in a chemical reaction. They...
Radical Substitution: Hydrogenolysis of Alkyl Halides with Tributyltin Hydride
Radical substitution reactions can be used to remove functional groups from molecules. The hydrogenolysis of alkyl halides is one such reaction, where the weak Sn–H bond in tributyltin hydride reacts with alkyl halides to form alkanes. Here, the reagent Bu3SnH yields tributyltin halide as a byproduct.
The bonds formed in this reaction are stronger than the bonds broken, making it energetically favorable. The reaction follows a radical chain mechanism similar to radical halogenation reactions,...
The bonds formed in this reaction are stronger than the bonds broken, making it energetically favorable. The reaction follows a radical chain mechanism similar to radical halogenation reactions,...


