Chiral Copper(0) Nanoparticles: Direct Synthesis and Interfacial Chiral Induction via Phase Transfer of Copper Nanoparticles

No clear-cut example has been hitherto known for the phase transfer involving the ligand exchange of copper nanoparticles (NPs) from an aqueous phase into an organic phase, and chiral copper NPs. We present the first isolation of chiral copper(0) NPs prepared by either the reduction of copper ions with hydrazine in the presence of a new chiral binaphthyl carboxylic acid 1 as a protective ligand in an organic solvent or the two-phase transfer involving the chiral ligand exchange of the polyvinyl pyrrolidone-protected copper NPs from the water phase to organic phase in the presence of the chiral protective ligand 1. This is the first example for the asymmetric (chiral) induction on the surface of the copper NPs by two-phase transfer of the achiral copper NPs.