Experimental Basicities of Superbasic Phosphonium Ylides and Phosphazenes
作者:Jaan Saame、Toomas Rodima、Sofja Tshepelevitsh、Agnes Kütt、Ivari Kaljurand、Tõiv Haljasorg、Ilmar A. Koppel、Ivo Leito
DOI:10.1021/acs.joc.6b00872
日期:2016.9.2
spanning more than 30 pKa units, has been compiled. Basicities of 47 compounds (around half of which are newly synthesized) are included. The solution basicity of the well-known t-Bu-N═P4(dma)9 phosphazene superbase is now rigorously linked to the scale. The compiled scale is a useful tool for further basicity studies in THF as well as in other solvents, in particular, in acetonitrile. A good correlation
的一些曾经测量(鏻叶立德)最强的超强碱的实验碱度被报告,并通过采用这些化合物,在THF超强碱的实验自洽碱度规模,达到AP ķ α(对的估计ķ一个的35)和跨过超过30 p K a单位,已被编译。包括47种化合物的碱性(其中大约一半是新合成的)。公知的溶液碱度吨-Bu-N = P 4(DMA)9磷腈超强碱现已与规模紧密相关。编制的量表是在THF以及其他溶剂(尤其是乙腈)中进一步进行碱度研究的有用工具。THF和乙腈中的碱度之间的良好相关性跨越了25个数量级,从而可以得到实验支持的乙腈中非常高的碱度(p K a > 40),而无法直接测量。提出了结构-基本趋势的分析。
Phosphazenyl Phosphines: The Most Electron‐Rich Uncharged Phosphorus Brønsted and Lewis Bases
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, protonaffinities (PA), and gas‐phase basicities (GB) as well as calculated and experimental pK values in THF are presented. In contrast
[EN] PHOSPHAZENYL PHOSPHINES, METAL COMPLEXES OF PHOSPHAZENYL PHOSPHINES AND THEIR MANUFACTURING AND USAGE<br/>[FR] PHOSPHINES DE PHOSPHAZÉNYLE, COMPLEXES MÉTALLIQUES DE PHOSPHINES DE PHOSPHAZÉNYLE ET LEUR FABRICATION ET UTILISATION
申请人:PHILIPPS UNIV MARBURG
公开号:WO2020221834A1
公开(公告)日:2020-11-05
The invention comprises Metal complexes or semi-metal complexes of Phosphazenylphosphines, their manufacturing and their usage for catalyzing chemical reactions.
Guanidinophosphazenes: Design, Synthesis, and Basicity in THF and in the Gas Phase
作者:Alexander A. Kolomeitsev、Ilmar A. Koppel、Toomas Rodima、Jan Barten、Enno Lork、Gerd-Volker Röschenthaler、Ivari Kaljurand、Agnes Kütt、Ivar Koppel、Vahur Mäemets、Ivo Leito
DOI:10.1021/ja053543n
日期:2005.12.1
dimethylamino (or tetramethylguanidino) fragments are replaced by methylated triguanide fragments, (tmg)2C=N-. The gas-phase basicity (around 300-310 kcal/mol) of the resulting base, [(tmg)2C=N-]3P=NH, having only one phosphorus atom, is predicted to exceed the basicity of (dma)3P=NH by more than 40 powers of 10 and to surpass also the basicity of the widely used commercial [(dma)3P=N]3P=N-t-Bu (t-BuP4)