炭化水素-水系 (L = ディメチルジルジル-2-ピリジル) ボラート) で容易なアレンC-H結合の活性化とアニオンLPt (II) Me2-によるアルカンの脱水化
関連する実験動画
Updated: Jul 11, 2026
09:45
A Protocol for Safe Lithiation Reactions Using Organolithium Reagents
Published on: November 12, 2016
Eugene Khaskin1, Peter Y Zavalij, Andrei N Vedernikov
1Department of Chemistry and Biochemistry, University of Maryland, College Park, 20742, USA.
Journal of the American Chemical Society
|October 5, 2006
まとめ
アニオンプラチナ (((II) 複合体は混合溶剤で反応して新しいプラチナ複合体を形成します. ナトリウムイオンはこれらの反応を著しく加速し,アリルまたはヒドリドプラチナ複合体の効率的な合成を可能にします.
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
- カタリシス カタリシス カタリシス
背景:
- アニオニック・ジメチル・ディ・2-ピリジル・ボラート・リガンドは,ユニークな協調性特性を有しています.
- プラチナ (((II) 複合体は,合成化学における汎用的な前駆体である.
研究 の 目的:
- 混合溶媒システムにおけるアニオンプラチナ (((II)) 複合体の反応性を調査する.
- アリルおよびヒドリドプラチナ (II) 複合体の形成を調査する.
- 反応動力学に対するカチオンの影響を決定する.
主な方法:
- アニオニックジメチルジ(2-ピリジル) ボラトジメチルプラチナ (II) コンプレックスと様々なプロティック溶媒 (RH/水) の反応.
- その結果生じるプラチナ複合体のスペクトル学的特徴.
- 反応速度に対するNa+の影響を評価するための運動学的研究.
主要な成果:
- 3: 1 RH/水混合物で観察された強力な反応により,Pt(II) アリル複合体 (ベンゼンおよびパラ-フッ素ベンゼン) またはヒドリドPt(II) オレフィン複合体 (サイクルアルケーン) が得られます.
- Na+カチオンの存在は,反応速度を劇的に加速させた.
- プロティック溶媒の性質は,形成されたプラチナ複合体の種類に影響を与えました.
結論:
- アニオン性プラチナ ((II) 複合体は,プロティック/水性媒体で豊富な反応性を示す.
- Na+カチョンは,これらの変化を加速させる上で重要な役割を果たします.
- この方法論は,合成的に価値のあるアリルおよびヒドリドプラチナ (II) 複合体への効率的な経路を提供します.
関連する概念動画
02:45E2 Reaction: Kinetics and Mechanism
SN2 substitutions and E2 eliminations of alkyl halides proceed via a concerted pathway. While the nucleophile attacks the alpha carbon in SN2 reactions, it functions as a strong base and abstracts a beta hydrogen in the E2 mechanism. The rate-limiting transition state in E2 elimination reactions is characterized by partially broken carbon–hydrogen and carbon–halogen bonds and a partially formed pi bond between the alpha and beta carbons. The beta hydrogen and halide are eliminated...
02:35Acid-Catalyzed Dehydration of Alcohols to Alkenes
In a dehydration reaction, a hydroxyl group in an alcohol is eliminated along with the hydrogen from an adjacent carbon. Here, the products are an alkene and a molecule of water. Dehydration of alcohols is generally achieved by heating in the presence of an acid catalyst. While the dehydration of primary alcohols requires high temperatures and acid concentrations, secondary and tertiary alcohols can lose a water molecule under relatively mild conditions.
02:23Alcohols from Carbonyl Compounds: Reduction
Reduction is a simple strategy to convert a carbonyl group to a hydroxyl group. The three major pathways to reduce carbonyls to alcohols are catalytic hydrogenation, hydride reduction, and borane reduction.
Catalytic hydrogenation is similar to the reduction of an alkene or alkyne by adding H2 across the pi bond in the presence of transition metal catalysts like Raney Ni, Pd–C, Pt, or Ru. Aldehydes and ketones can be reduced by this method, often under mild to moderate heat (25–100°C) and...
Catalytic hydrogenation is similar to the reduction of an alkene or alkyne by adding H2 across the pi bond in the presence of transition metal catalysts like Raney Ni, Pd–C, Pt, or Ru. Aldehydes and ketones can be reduced by this method, often under mild to moderate heat (25–100°C) and...
01:01Acid Halides to Carboxylic Acids: Hydrolysis
Hydrolysis of acid halides is a nucleophilic acyl substitution reaction in which acid halides react with water to give carboxylic acids. The reaction occurs readily and does not require acid or a base catalyst.
As shown below, the mechanism involves a nucleophilic attack by water at the carbonyl carbon to form a tetrahedral intermediate. This is followed by the reformation of the carbon–oxygen π bond along with the departure of a halide ion. A final proton transfer step yields carboxylic acid...
As shown below, the mechanism involves a nucleophilic attack by water at the carbonyl carbon to form a tetrahedral intermediate. This is followed by the reformation of the carbon–oxygen π bond along with the departure of a halide ion. A final proton transfer step yields carboxylic acid...
01:12Acid Halides to Esters: Alcoholysis
Alcoholysis is a nucleophilic acyl substitution reaction in which an alcohol functions as a nucleophile. Acid halides react with alcohol to produce esters. The mechanism proceeds in three steps:
01:29Leveling Effect
In acid-base chemistry, the leveling effect refers to the limitation imposed by the solvent on the strength of acids and bases in solution. When a base stronger than the solvent's conjugate base is used, it deprotonates the solvent until the base is entirely consumed, making it ineffective against weaker acids. Conversely, an acid stronger than the solvent's conjugate acid protonates the solvent until the acid is depleted, rendering it ineffective against weaker bases. Essentially, the solvent...