环三离子的第一过渡金属络合物已通过31 P NMR光谱法明确鉴定。配体经由中心磷原子配位至铂(II),但是仅当至少一个外部磷原子具有非芳族取代基时才如此。取决于系统,形成反式(动力学反应产物)和/或顺式(热力学反应产物)配合物。的1个Ĵ之间的耦合常数195的Pt和CTI(P的中心磷原子甲)是小两个顺式和反式异构体,900和1300赫兹之间,而在这些配合其他膦从铂衍生(II)起始物料显示正常1 JPtP值。这些结果表明,在整个带正电的配体与铂(II)阳离子之间可能存在长的P–Pt键。包括预测的CTI及其Pt(II)配合物的31 P NMR位移在内的计算在很大程度上支持了我们的实验结果。
Alkyl and aryl dicationic derivatives of cyclic triphosphenium ions
作者:Keith B. Dillon、Andrés E. Goeta、Judith A. K. Howard、Philippa K. Monks、Helena J. Shepherd、Amber L. Thompson
DOI:10.1039/b716027e
日期:——
Direct alkylation of cyclictriphospheniumions by triflates to give di-ium dications is only possible for small organic substituents on the attacking reagent. The dicationic products are not intrinsically unstable, however, and in many instances they may be synthesised by an alternative route, pioneered by Schmidpeter and co-workers. These species may be readily identified in solution by (31)P NMR