Thermal Stability, Decomposition Paths, and Ph/Ph Exchange Reactions of [(Ph<sub>3</sub>P)<sub>2</sub>Pd(Ph)X] (X = I, Br, Cl, F, and HF<sub>2</sub>)
作者:Vladimir V. Grushin
DOI:10.1021/om0001265
日期:2000.5.1
[(Ph3P)2Pd(Ph)X], where X = I (1), Br (2), Cl (3), F (4), and HF2 (5), possess different thermal stability and reactivity toward the Pd−Ph/P−Ph exchange reactions. While 1 decomposed (16 h) in toluene at 110 °C to [Ph4P]I, Pd metal, and Ph3P, complexes 2 and 3 exhibited no sign of decomposition under these conditions. Kinetic studies of the aryl−aryl exchange reactions of [(Ph3P)2Pd(C6D5)X] in benzene-d6
[[Ph 3 P)2 Pd(Ph)X]类型的络合物,其中X = I(1),Br(2),Cl(3),F(4)和HF 2(5),具有不同的对Pd-Ph / P-Ph交换反应的热稳定性和反应性。尽管1在110°C的甲苯中分解(16小时)为[Ph 4 P] I,Pd金属和Ph 3 P,但配合物2和3在这些条件下均未显示分解迹象。[[Ph 3 P)2 Pd(C 6 D 5)的芳基-芳基交换反应的动力学研究)-x]在苯-d 6中证明交换速率以1 > 2 > 3的顺序降低,在75°C的苯中观察到的速率常数比k I:k Br:k Cl为约。100:4:1为1 - d 5,2 - d 5,和3 - d 5。络合物,极性介质和路易斯酸(例如Et 2 O·BF 3)浓度的降低促进了交换。与[Bu 4N] PF 6加快了2 - d 5的交换反应,[Bu 4 N] Br由于形成了阴离子四配位[[Ph 3 P] Pd(C