Pd(0) -ヒドロキノンディフォシン複合体による二酸化炭素減少
Kyle T Horak1, Theodor Agapie1
1Division of Chemistry and Chemical Engineering, California Institute of Technology , 1200 East California Boulevard MC 127-72, Pasadena, California 91125, United States.
Journal of the American Chemical Society
|March 8, 2016
まとめ
水素キノンのリガンドを備えた新しいパラジウム複合体は,酸素を含む様々な小分子を効果的に減少させます. この金属結合反応は,リガンドを強調する.
科学分野:
- 有機金属化学
- 協調化学
背景:
- 新しいリガンドの開発は,触媒の進歩に不可欠です.
- 非無害なリガンドは,金属複合体においてユニークな反応経路を提供する.
研究 の 目的:
- ハイドロキノン分子を含んだ新しいp-テルフェニルディフォスフィンのリガンドを合成し,特徴づけること.
- 特に小分子による金属複合体の反応性を調べる.
- 2座標パラジウム-ヒドロキノン複合体による酸化減少のメカニズムを解明する.
主な方法:
- 水素キノンのコアを備えたp-テルフェニルディフォスフィンリガンドの合成
- 金属化反応は,Ni(0) とPd(0) の前駆体により,金属キノン複合体を形成する.
- 2座標のPd(0) -ヒドロキノン複合体を1ポットメタリングと還元で生成する.
- O2,NO,N2O,有機酸化物を含む様々な小分子による反応性研究.
- コントロール化合物と低温試験を用いたメカニズム調査.
主要な成果:
- 新しいヒドロキノンを含むディフォスフィンリガンドが合成されました.
- 擬四面体Ni(0) とPd(0) -キノン複合体が形成された.
- 2座標Pd(0) -ヒドロキノン複合体は,小分子に対する金属結合反応を示した.
- この複合体は,O2,NO,N2O,および有機酸化物を定量的に減少させ,Pd(0) -キノンの生成物を生成した.
- ディオキシゲン還元は,エタ ((2) -ペロキソ中間体を経由し,その後にリガンド酸化が行われます.
結論:
- パラジウム複合体のヒドロキノン分子は,小分子活性化と還元に重要な役割を果たします.
- 2座標Pd(0) -ヒドロキノン複合体は,様々な基板に対する強力な還元剤である.
- ダイオキシゲン活性化は,後続的な還元段階にヒドロキノンリガンドが参加する,内部球のPdベースのプロセスである.
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