the observation of large negative values of ΔS‡. Rates of the reactions are significantly dependent on nature of the phosphine ligand L with the trend being PMePh2 > PPh3 > P(OPh)3. The kinetic isotope effect (KIE) values, kH/kD, were obtained in the present study and are found to be close to the normal value of 1 in the corresponding reactions, showing that nature of the ancillary ligands containing
CH 3 I或CD 3 I与环
铂(II)配合物[PtMe(CˆN)L],1a-1e的氧化加成反应,其中CˆN =
2-苯基吡啶酸酯(ppy)或苯并[h]
喹啉酸酯(bhq),并且L = PPh 3,PMePh 2或P(OPh)3,在CH 2 Cl 2溶剂中得到有机
铂(IV)产物[PtMe 2 I(CˆN)L]。NMR光谱(1 H和31 P),和X射线晶体学(通过DFT计算支持)清楚地表明,在每种情况下的热力学异构体的产品2A-2E,与I
配体的反式至CN的是C而不是相关的动能异构体,其中
配体我是反式对我来说,获得。利用紫外可见光谱研究了反应的动力学,并基于其干净的二级动力学,自由基陷阱未能抑制反应和观察到的现象,认为反应是通过常见的S N 2机理发生的。ΔS ‡的大负值。反应的速率显着取决于
膦配体L的性质,趋势是PMePh 2 > PPh 3 > P(OPh)3。动力学同位素效应(KIE)值k