摘要:
A transition metal Lewis acid with metal-centered chirality is obtained by η6 :η1 :η1 coordination of a 1,3-disubstituted arene with a phosphane and a pyrazole tether (PArN) to ruthenium. The three-legged piano-stool complex [{η6 :η1 :η1 -(PArN)}Ru(H2 O)]2+ (structure depicted) displays remarkable configurational stability. Its planar chiral, neutral precursor [{η6 :η1 -(PArN)}RuCl2 ] can be resolved by preparative HPLC.