Dual Supermesityl Stabilization: A Room‐Temperature‐Stable 1,2,4‐Triphosphole Radical, Sigmatropic Hydrogen Rearrangements, and Tetraphospholide Anion
作者:Alex S. Ionkin、William J. Marshall、Brian M. Fish、Alexander A. Marchione、Laurie A. Howe、Fredric Davidson、Charles N. McEwen
DOI:10.1002/ejic.200800265
日期:2008.5
Cesium 3,5-bis(2,4,6-tri-tert-butylphenyl)-1,2,4-triphospholide (12) and cesium 5-(2,4,6-tri-tert-butylphenyl)tetraphospholide (13) were synthesized and isolated with flat five-membered rings, which are an indication of the aromaticity in these anions. Compound 13 is the first example of a stable tetraphospholide anion, which is structurally characterized. Kinetic stabilization of the 1,2,4-triphospholide
铯 3,5-双(2,4,6-三叔丁基苯基)-1,2,4-三磷酯 (12) 和 5-(2,4,6-三-叔丁基苯基)四磷酯 (13) ) 合成并分离出具有扁平五元环的化合物,这表明这些阴离子具有芳香性。化合物 13 是稳定的四磷酸阴离子的第一个例子,其结构特征。1,2,4-triphospholide 系统由两个超异位基团的动力学稳定导致检测到室温稳定的自由基 17 并在第一个稳定的 1H-1,2 中观察到一系列连续的 σ 氢位移,具有 P-H 键的 4-三磷酸 14。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)