Rhodium Complexes Based on Phosphorus Diamide Ligands: Catalyst Structure versus Activity and Selectivity in the Hydroformylation of Alkenes
作者:Saskia C. van der Slot、Paul C. J. Kamer、Piet W. N. M. van Leeuwen、Jan Fraanje、Kees Goubitz、Martin Lutz、Anthony L. Spek
DOI:10.1021/om9910120
日期:2000.6.1
that the monodentate ligands form mixtures of HRhL2(CO)2 and HRhL(CO)3. The ratio HRhL2(CO)2:HRhL(CO)3 depends on the ligand concentration and its bulkiness. The bidentate ligands form stable, well-defined catalysts with the structure HRhL∩L(CO)2 under hydroformylation conditions. Both monodentate and bidentate ligands have been tested in the hydroformylation reaction of 1-octene. The monodentate ligands
研究了1-辛烯与磷二酰胺配体的铑催化加氢甲酰化反应。已经合成了衍生自1,3,5-三取代的缩二脲结构的四个单齿二酰胺磷二酰胺配体和六个二齿磷二酰胺配体。这些类型的配体将空间体积与π酸结合在一起。在CO / H 2下形成的铑配合物已经通过高压光谱技术进行了表征。光谱实验表明,单齿配体形成HRhL 2(CO)2和HRhL(CO)3的混合物。比率HRhL 2(CO)2:HRhL(CO)3取决于配体浓度及其体积。在加氢甲酰化条件下,双齿配体形成稳定,结构明确的HRhL∩L(CO)2催化剂。在1-辛烯的加氢甲酰化反应中已经测试了单齿和双齿配体。单齿配体形成非常活泼的催化剂,但是产物的线性支化比很低。与单齿配体相比,双齿配体显示出改进的选择性,并且活性仅稍低。