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予期せぬH2O誘発のAr-X活性化が,トリフローロメチルパラジウム (((II) アリルスにより発生した
Vladimir V Grushin1, William J Marshall
1Central Research and Development, E.I. DuPont de Nemours & Co., Inc., Experimental Station, Wilmington, Delaware 19880-0328, USA. vlad.grushin-1@usa.dupont.com
Journal of the American Chemical Society
|April 6, 2006
まとめ
水の痕跡は,フェニル-ハリド結合のためのパラジウム複合体を活性化し,ビフェニルを形成します. このプロセスは,フェニルハリド結合の活性化およびその後の産物形成に不可欠なパラジウム (II) をパラジウム (III) に還元することを含む.
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
- 協調化化学について
背景:
- パラジウム複合体は,有機合成における重要な触媒である.
- パラジウム複合体の活性化メカニズムを理解することは,効率的な触媒システムの開発の鍵です.
- パラジアムのトリフルオロメチルおよびアリルリガンドは,反応性に影響を与える可能性があります.
研究 の 目的:
- 新しいパラジウム (II) コンプレックスとディホスフィンのリガンドを合成し,特徴づけること.
- これらの複合体によるフェニルハリド結合の活性化を調査する.
- 触媒サイクルにおける水の役割を明らかにする.
主な方法:
- [L-L) Pd (Ar) (CF3) ]複合体の合成と完全な特徴付け.
- 異なる条件下でのフェニルハリド活性化反応の調査.
- 運動分析および中間物質の識別を含むメカニズム研究.
主要な成果:
- dppe,dppp,およびtmedaリガンドを含む新しいパラジウム (II) コンプレックスが成功して合成されました.
- [dppePdPhCF3) ]は,フェニルヨウ酸化物とフェニル塩化物の活性化が実証され,ビフェニル.
- 水の痕跡は反応に不可欠であり,Pd{\displaystyle Pd{\displaystyle Pd}{\displaystyle Pd}{\displaystyle Pd}{\displaystyle Pd}{\displaystyle Pd}{\displaystyle Pd}{\displaystyle Pd}{\displaystyle Pd}}{\displaystyle Pd}{\displaystyle Pd}{\displaystyle Pd}{\displaystyle Pd}{\displaystyle Pd}{\displaystyle Pd}{\displaystyle Pd}{\displaystyle Pd}{\displaystyle Pd}{\displaystyle Pd}{\displaystyle Pd}{\displaystyle Pd}{\displaystyle Pd}{\displaystyle Pd}{\displaystyle Pd}{\displaystyle Pd}{\displaystyle Pd}}{\displaystyle Pd}{\displaystyle Pd}{\displaystyle Pd}}{\displaystyle Pd}{\displaystyle Pd}{\displaystyle Pd}}
結論:
- 水はPd(II) をPd(0) に減らすことによって,触媒を起動する上で重要な役割を果たします.
- 反応は,伝達処理と還元除去の段階を経て進行する.
- アルファ-Fの移転と水解を含む代替経路が,水による減少のために提案されました.
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