Bond Forming Reactions on Iridium Centers (Chemistry)

本研究在催化领域具有重要意义。这项工作的结果将有助于合成燃料领域的发展。建议用反式rir (CO)LL配合物，R =烷基或烷氧基，L =磷供体来研究成键反应。这些有16个电子的方形平面配合物很容易加入分子，使碳和氢、氧和氢、碳和碳、氧和碳键在铱上形成顺式键。在许多情况下，在还原消除反应中可以观察到键的形成。例如，在反式RIr(CO)L上加入二氢、HX或金属氢化物可以形成C-H和O-H键，在反式RIr(CO)LL上加入一些烷基卤化物和酸性氯化物可以形成C-C键（R=烷基），在反式ROIr(CO)LL上加入酸性氯化物和醛可以形成C-O键。该方案的独特之处在于能够从类似的配合物中研究不同的成键反应。这样一个系统的研究可以让我们更好地理解通过还原消除反应形成键的机制。

The research proposed has significance in the area of catalysis. The results of this work will aid in the development of the synthetic fuels area. It is proposed to use the complexes, trans-RIr(CO)LL,R = alkyl or alkoxy and L = phosphorus donor, to examine bond forming reactions. These sixteen-electron square planar complexes readily add molecules bringing carbon and hydrogen, oxygen and hydrogen, carbon and carbon, and oxygen and carbon bonds into cis positions on the iridium. In many cases the formation of bonds in a reductive elimination reaction is observed. For instance C-H and O-H bond formation occur by addition of dihydrogen, HX or metal hydrides to trans RIr(CO)L, C-C bond formation occurs by addition of some alkyl halides and acid chlorides to trans RIr(CO)LL (R=alkyl) and C-O bond formation occurs by addition of acid chlorides and aldehydes to trans ROIr(CO)LL. The unique feature of this proposal is the ability to study different bond forming reactions from analogous complexes. Such a systematic investigation may allow a greater understanding of the mechanisms of bond formation by reductive elimination reactions.