S)-BINAPHOS; Ar = 3,5-(CF3)2C6H3) to the more stable SP-4-3 isomer (8b) is faster than CO insertion into either 8a or 8b, the CO insertion being reversible. (2) For the PdII−L1-catalyzed copolymerization of propene and CO, there exist at least two major resting states, most probably acylpalladium, (SP-4-3)-[Pd(COR)(L2)(L1)][BAr4] (3; L2 = CH3CN, CO), and alkylpalladium, [PdCH2CH(CH3)C(O)R}(L1)][BAr4]
当采用高压NMR技术时,揭示了以下两个事实。(1)(
SP -4-4)-[Pt(CH 3)(CO)(L 1)] [BAr 4 ](8a ; L 1 =(R,S)-BINAPHOS; Ar = 3,5-(CF 3)2 C 6 H 3)到更稳定的
SP -4-3异构体(8b)比CO插入8a或8b的速度快,CO插入是可逆的。(2)对于Pd II -L 1
丙烯和CO的催化共聚反应,至少存在两个主要的静止状态,最可能是酰基铝((
SP -4-3)-[Pd(COR)(L 2)(L 1)] [BAr 4 ](3 ; L 2= CH 3 CN,CO)和烷基
钯,[Pd CH 2 CH(CH 3)C(O)R}(L 1)] [BAr 4 ](5a)。