摘要
過渡金屬一般透過配位基的鍵結來形成一種最佳態以供催化反應進行。然而形成這種最佳態，需要在金屬活化中心有很精準之電子調控。由於金屬中心的鹼度將決定催化先驅物及產物的鍵結及離去；此外，在氧化加成及還原脫去步驟中，金屬活化中心一般會變化達到三種氧化態。因此，若有具氧化還原不無辜的配位基鍵結於金屬活化中心，將可獲得多種在催化上的好處：其一，金屬中心的路易士酸鹼度將可由具氧化還原不無辜的配位基透過電子流動來調控；其二，可藉由電子轉移來避免處於不穩定的金屬活化中心之高氧化態；另外，對於某些反應，具氧化還原不無辜的配位基可參與先驅物之活化，因此增加催化反應速度。在本篇內文中，我們將探討幾個常見具氧化還原不無辜的配位基，以及他們在催化反應中所扮演的角色。
並列摘要
Transition metals are typically coordinated by ligands to create a preferred situation for catalysis. This requires a precisely electronic control since basicity of the metal sites determines binding of substrates and libration of products. In addition, the number of oxidation state of the transition metal center usually varies by 2 when oxidative addition and reductive elimination steps occur. The presence of redox non-innocent ligands provides a great deal of advantages over the traditional redox inactive ones. Lewis acidity on the metal site can be modulated by electron delocalization in between. In addition, the unstable high oxidation state metal centers can be avoided by accepting electron density from the redox non-innocent ligands. In some cases the redox non-innocent ligands involve substrate activation. This cooperative participation enhances reactivity. In this short report, we will discuss some of common redox non-innocent ligands and importance of their roles in catalysis.
延伸閱讀
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