Enforced η<sup>1</sup>-Fluorenyl and Indenyl Coordination to Zirconium: Geometrically Constrained and Sterically Expanded Complexes Derived from the Bifunctional (FluPPh<sub>2</sub>NAr)<sup>−</sup> and (IndPPh<sub>2</sub>NAr)<sup>−</sup> Ligands
作者:Pascal Oulié、Christelle Freund、Nathalie Saffon、Blanca Martin-Vaca、Laurent Maron、Didier Bourissou
DOI:10.1021/om700974g
日期:2007.12.1
The (FluPPh2NAr) and (IndPPh2NAr) ligands 2a–c and 4a–c (a, Ar = Ph; b, R = DIPP; c, = Mes) were readily prepared by Staudinger reactions between aryl azides and Flu/Ind diphenylphosphines, and they were coordinated to zirconium via toluene elimination. The propensity of the pendent phosphazene group to enforce low hapticity of the Flu and Ind rings in the ensuing complexes has been demonstrated experimentally
(FluPPh 2 NAr)和(IndPPh 2 NAr)配体2a – c和4a – c(a,Ar = Ph; b,R = DIPP; c,= Mes)很容易通过芳基叠氮化物和Flu /之间的Staudinger反应制备茚二苯基膦,并通过甲苯消除将它们与锆配位。实验性和理论上证明了侧基磷腈基团在随后的络合物中增强Flu和Ind环的低触觉的倾向。特别令人感兴趣的是,两种配合物在光谱和结构上都证明了几何约束和空间扩展的结构[(FluPPh2 NPh)ZrBn 3 ] 5a和[(IndPPh 2 NPh)ZrBn 3 ] 7a。此外,在氮的芳基取代基的能力来调制工业环的哈普托数(从η 1,至η 2,η 3)已被证实,和分子内CH-活化反应,导致双重环金属络合物6C和8C当R = Mes时,已经观察到。