Pseudorotation in pentacoordinated phosphorus compounds. The influence of the conformational transmission effect on the barriers to pseudorotation in cyclic alkoxyphosphoranes
作者:A. E. H. De Keijzer、L. H. Koole、Hendrick M. Buck
DOI:10.1021/ja00226a012
日期:1988.8
oxyphosphoranes I (R1 = H, Me; R2 = Me, Ph; R3 = Me, OEt; R4 = Me, cyclopentylmethyl, etc.) is used to examine the influence of the conformational transmission effect on the barriers to pseudorotation in pentacoordinated P compds. The pseudorotation rates of monocyclic oxyphosphoranes exhibiting the conformational transmission effect is 2-4 times faster as compared to their counterparts in which the effect is
一个可变温度。13C NMR 研究一系列单环氧正膦 I (R1 = H, Me; R2 = Me, Ph; R3 = Me, OEt; R4 = Me, 环戊基甲基等) 用于检查构象传递效应对五配位 P 化合物中伪旋转的障碍。与不存在该效应的对应物相比,表现出构象传递效应的单环氧正膦的假旋转速率快 2-4 倍。由于构象传输效应,中间方形平面结构的基础配体的构象变化导致激活势垒降低 2-3 kJ mol-1。