Bulky Phosphinines: From a Molecular Design to an Application in Homogeneous Catalysis
作者:Jarno J. M. Weemers、Willem N. P. van der Graaff、Evgeny A. Pidko、Martin Lutz、Christian Müller
DOI:10.1002/chem.201300557
日期:2013.7.1
same time, axial chirality and a sufficiently high energy barrier for internal rotation to prevent enantiomerization. Both enantiomers of 5 were isolated by means of chiral analytical HPLC, and their absolute configurations could be assigned by combining experimental data and DFT calculations. Despite its substitution pattern, 5 can still coordinate to transition‐metal centers through the lone pair of
通过在硬磷-杂环骨架的特定位置引入空间上需要的取代基,可以实现不对称取代的大体积次膦的设计和制备。化合物5同时显示出轴向手性和足够高的能垒,以用于内部旋转以防止对映异构化。通过手性分析HPLC分离了5个对映体,可以通过结合实验数据和DFT计算来确定它们的绝对构型。尽管有其取代模式,但5仍可通过磷原子上孤对的电子配位至过渡金属中心。快速C通过使用[Cp * IrCl 2 } 2 ](Cp * = 1,2,3,4,5-五甲基甲基环戊二烯基)作为金属前体,可在磷杂环2位附近的相邻芳基取代基上实现H活化。5的外消旋混合物被用作反式-2-辛烯的Rh催化加氢甲酰化反应中的π受体低配位磷配体,这显然表明其倾向于形成2-甲基辛醛。