Phosphazenyl Phosphines: The Most Electron‐Rich Uncharged Phosphorus Brønsted and Lewis Bases
作者:Sebastian Ullrich、Borislav Kovačević、Xiulan Xie、Jörg Sundermeyer
DOI:10.1002/anie.201903342
日期:2019.7.22
It was discovered that phosphazenyl phosphines (PAPs) can be stronger P‐superbases than the corresponding Schwesinger type phosphazene N‐superbases. A simple synthetic access to this class of PR3 derivatives including their homologization is described. XRD structures, proton affinities (PA), and gas‐phase basicities (GB) as well as calculated and experimental pK values in THF are presented. In contrast
已发现,磷腈烯基膦(PAPs)可以比相应的Schwesinger型磷腈N-超强碱更强的P-超强碱。描述了对这类PR 3衍生物的简单合成途径,包括其同源性。给出了XRD结构,质子亲和力(PA)和气相碱度(GB)以及在THF中计算得出的pK和实验值p K的值。与它们的N碱对应物相比,PAP在过渡金属化学中也是特权配体。实际上,它们是目前已知最强的不带电P受体,超过了经典的和最近发现的配体,例如PtBu 3 和咪唑啉-2-亚胺基膦(IAP)的低Tolman电子参数(TEP)和大锥角。