For a series of substituted styrenes lgk2 is the linear function of Hammett σp values with a slope ca.–1. For a series of ring-substituted complexes (1) lgk2 correlates with the pKa of the parent benzylamines with a slope of 0.98. The results are interpreted in terms of a mechanism involving intermediate protonation of (1), π-co-ordination of alkene, and subsequent rate-determining intramolecular insertion
的
乙烯化的动力学邻-palladated NN由-dialkylbenzylamines(1A-G)CH 2 CHC 6 H ^ 4 - [R 3 - p(R 3 = H,
氯,
溴,Me和M
EO)从相应的2- dialkylaminomethylstilbenes( 2)主要在30°C的
乙酸溶剂中进行研究。该反应遵循二级动力学:d [(2)] / d t = k 2 [(1)] [
苯乙烯]。在碱
金属
高氯酸盐(MClO 4)和低浓度
高氯酸k 2的存在下,速率常数k 2显着增加与[HClO 4 ]成正比。结果表明,盐的作用源于溶剂分解反应MClO 4 + HOAc⇌MOAc + HClO 4。将二聚体(1a)转化成相应的单体(3)使反应停止,但是后一种很容易与
苯乙烯形成π-络合物。确定了1:1π复合物的稳定常数,并建立了它们的哈米特相关性(具有–1.87的斜率)。对于一系列的取代
苯乙烯LG ķ 2是哈米特σ的线性函数p值与斜率约