has been synthesized and characterized by a thorough 1 H NMR analysis. Reaction of HL with K 2 [PtCl 4 ] in acetic acid gives [Pt(L)Cl] ( 1 ), where L acts as a tridentate N–C–N pincer ligand. The analogous palladium(II) derivatives [Pd(L)Cl] ( 2 ), and [Pd(L)(OAc)] ( 3 ), were first prepared through a transmetalation reaction between Pd(OAc) 2 and the organomercury compound [Hg(L)Cl] ( 4 ). The structures
Chiral Pt(II)/Pd(II) pincer complexes that show C–H⋯Cl hydrogen bonding: Synthesis and applications to catalytic asymmetric aldol and silylcyanation reactions
作者:Myeong Sik Yoon、Rengan Ramesh、Jeongryul Kim、Dowook Ryu、Kyo Han Ahn
DOI:10.1016/j.jorganchem.2006.09.055
日期:2006.12
indicate the existence of intramolecular C–H⋯Cl hydrogen bonding both in solution and in solid states. Chloride abstraction from 5a by treatment with silver triflate resulted in the corresponding triflate complex 6a, which generates the corresponding cationic aqua complex 7a in the presence of water molecules. The Pt(II) complex 6a/7a was used as asymmetriccatalyst in the aldol reaction between methyl isocyanoacetate