ヘム・ヒドロペロキシダースモデルによるO−O結合活性化のプロトン誘導リドックス制御
Jake D Soper1, Sergey V Kryatov, Elena V Rybak-Akimova
1Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge Massachusetts 02139-4207, USA.
Journal of the American Chemical Society
|April 3, 2007
まとめ
ハングマンメタルポルフィリン複合体は,酸化反応におけるO−O結合活性化を制御するために,陽子ドナー群を使用して,酵素活性部位を模倣する. この陽子制御は反応経路を決定し,触媒効率を高めます.
科学分野:
- バイオ・オーガニック化学 バイオ・オーガニック化学
- 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
背景:
- ハングマンメタルポルフィリン複合体は,ヒドロペロキシダース酵素におけるヘムコファクター二次調整環境をモデル化しています.
- これらの複合体は,酸化還元活性金属の中心の上に配置された酸塩基群を特徴とする.
研究 の 目的:
- ハングマンメタルポルフィリン複合体におけるO−O結合活性化に対するプロトンドナーグループの影響を調査する.
- 自然の酵素系で観察される"引き寄せ"効果をモデル化するために.
主な方法:
- ストップフロー運動調査が採用されました.
- 異なる機能群 (酸対メチルエステル) と過酸化酸とのハンマン鉄複合体の反応は,低温で研究されました.
主要な成果:
- 高価量Fe=O活性サイトは,酸およびメチルエステル機能群を持つハングマン複合体で生成された.
- メチルエステルハングマン複合体との反応は,O−O異解 (化合物I) と同解 (化合物II) の両製品を産生した.
- 酸ハングマン複合体との反応は,ホモリティックなO−O結合の分裂を阻害するヘテロリシス産物を独占的に生成した.
結論:
- 陽子制御は,O−O結合の活性化のリドックス特異性を (2e−ヘテロリシス対1e−ホモリシス) 決定する.
- この選択性は,ハングマンメタルポルフィリン複合体の触媒性能を強調しています.
- 触媒化におけるプロトン結合型マルチ電子反応の利用に関する基準を提示する.
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