Lithium Phosphoranylidene Carbenoids Mes*-P(E)C(X)Li(THF)<sub>3</sub> (E = NMes*, C(SiMe<sub>3</sub>)<sub>2</sub>; X = Br, Cl, F): Synthesis and Structural Investigations in Solution and Solid State
作者:Thomas Baumgartner、Dietrich Gudat、Martin Nieger、Edgar Niecke、Thomas J. Schiffer
DOI:10.1021/ja990074e
日期:1999.6.1
Phosphoranylidene carbenoids Mes*-P(E)C(X)Li(THF)3} (E = C(SiMe3)2, NMes*; X = F, Cl, Br, 10−13, 15) were synthesized and their molecular structures characterized by low-temperature X-ray diffractometry and multinuclear NMR studies. The experiments confirm the presence of monomeric molecules with THF-solvated metal atoms in both solution and solid state. The solid carbenoids display elongated C−X
合成了亚磷酰类卡宾 Mes*-P(E)C(X)Li(THF)3}(E = C(SiMe3)2, NMes*; X = F, Cl, Br, 10−13, 15)并合成了它们的通过低温 X 射线衍射和多核 NMR 研究表征的分子结构。实验证实了在溶液和固态中都存在具有 THF 溶剂化金属原子的单体分子。固体类碳化合物显示出延长的 CX 键和碳键角的扭曲,这代表了类碳化合物的典型特征,并表明将键合情况解释为碳负离子和溶剂化金属阳离子之间的接触离子对。NMR 研究证实了这一点,该研究表明溶液中两种组分之间的动态交换可以在 2D 6Li,31P 位移相关性中直接监测。