アルミニウム-リガンドの協同N-H結合の活性化と脱水誘導結合の例である
Thomas W Myers1, Louise A Berben
1Department of Chemistry, University of California, Davis, California 95616, USA.
Journal of the American Chemical Society
|June 27, 2013
まとめ
この研究では,分子アルミニウム複合体が金属-リガンドの協力によりN-H結合を活性化する方法について詳細に説明しています. このプロセスは,新しい化学的変換と触媒的応用を可能にします.
科学分野:
- 有機金属化学 有機金属化学
- カタリシス カタリシス カタリシス
- 無機化学 無機化学とは
背景:
- 金属-リガンドの協力は,小分子活性化のための有機金属化学の重要な戦略です.
- アルミニウム複合体,特にポリデントリガンドを含む複合体は,ユニークな反応性プロファイルを提供します.
- N-H結合の活性化を理解することは,新しい合成方法論の開発に不可欠です.
研究 の 目的:
- 分子アルミニウム複合体によるN-H結合の活性化を記述する.
- 金属-リガンド協力によるN-H結合活性化のメカニズムを調査する.
- デヒドロゲン化結合反応におけるアルミニウム複合体の触媒的可能性を調査する.
主な方法:
- トリデント酸ビス (((イミノ)) ピリジンのアルミニウム水化物複合体の合成と特徴付け.
- アリリンとアルミニウム複合体の反応により,N-H活性化製品が形成されます.
- 活性化製品の熱処理により,その後の変換を研究する.
- ベンジラミンデヒドロゲネーティブカップリングにおける複合体の触媒評価.
主要な成果:
- アルミニウム複合体 ((Ph) I2P(2-))AlH (1b) は,アニリンにおけるN-H結合を成功裏に活性化させ,N-H活性化製品 ((Ph) HI2P(-))AlH(NHAr) (2) を生成した.
- 加熱中介2は,H2の放出とアルミニウムアミド複合体 ((Ph) I2 P ((-)) Al ((NHAr)) (3) の形成につながった.
- 複合体1bは,ベンジラミンの脱水酸化結合において触媒的活性を示し,水素,アンモニア,イミンを生成した.
結論:
- トリデント酸ビスイミノピリジンリガンドを含む分子アルミニウム複合体は,金属リガンドの協力によってN-H結合を活性化することができます.
- 観測された変容は,N-H結合機能化と,その後の触媒脱水酸化のための経路を強調しています.
- この研究は,アルミニウム媒介の触媒とN-H結合活性化戦略の範囲を拡大します.
さらに関連する動画
10:24Detection of Ligand-activated G Protein-coupled Receptor Internalization by Confocal Microscopy
Published on: April 9, 2017
11.4K
07:20Amide Coupling Reaction for the Synthesis of Bispyridine-based Ligands and Their Complexation to Platinum as Dinuclear Anticancer Agents
Published on: May 28, 2014
14.5K
関連する概念動画
02:51Metal-Ligand Bonds
24.4K
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
24.4K
01:58Cooperative Allosteric Transitions
8.8K
Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
8.8K
01:17Spin–Spin Coupling: One-Bond Coupling
1.5K
Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
1.5K
01:20Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)
1.7K
Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
1.7K
01:22Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)
1.5K
Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the involved orbitals. The...
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the involved orbitals. The...
1.5K
02:40Ligand Binding Sites
15.1K
Proteins are dynamic macromolecules that carry out a wide variety of essential processes; however, the activities of most proteins depend on their interactions with other molecules or ions, known as ligands.
Protein-ligand interactions are quite specific; even though numerous potential ligands surround a cellular protein at any given time, only a particular ligand can bind to that protein. Moreover, a ligand binds only to a dedicated area on the surface of the protein, known as the...
Protein-ligand interactions are quite specific; even though numerous potential ligands surround a cellular protein at any given time, only a particular ligand can bind to that protein. Moreover, a ligand binds only to a dedicated area on the surface of the protein, known as the...
15.1K