RhCi(PPh3)3<>RhCI(PPh3h2+ PPh3(25 C K=2.3×10-7 T7 2RhCI(PPh3)3<>Rh2(u-CD2(PPh3)4 给体( donor)的π酸性强度 π酸性小,反馈键弱,活性大 PPh3比CO和PC的π酸性小,活性大 RhCi(PPh3)3 +C2H4<> RhCI(C2H4(PPh3h2+ PPh3 (解离) RhC(PEt3)3+C2H4<>RhCl(C2H4)(PEt)(加成)RhCl(PPh3 )3  RhCl(PPh3 )2 + PPh3 (25 °C) K=2.3×10–7 T↗ 2RhCl(PPh3 )3  Rh2 (–Cl)2 (PPh3 )4 • 给体 (donor)的酸性强度 酸性小, 反馈键弱, 活性大 PPh3比CO和PCl3的酸性小, 活性大 RhCl(PPh3 )3 +C2H4  RhCl (C2H4 )(PPh3 )2 + PPh3 (解离) RhCl(PEt3 )3 +C2H4  RhCl (C2H4 )(PEt3 )3 (加成)