An Anionic Dinuclear BINAP−Ruthenium(II) Complex:  Crystal Structure of [NH2Et2][{RuCl((R)-p-MeO-BINAP)}2(μ-Cl)3] and Its Use in Asymmetric Hydrogenation

Treatment of [RuCl 2 (COD)] n with ( R )- p -MeO-BINAP ( p -MeO-BINAP = 2,2‘-bis(bis( p -methoxyphenyl)phosphino)-1,1‘-binaphthyl) in toluene in the presence of triethylamine afforded the anionic dinuclear complex [NH 2 Et 2 ][ { RuCl(( R )- p -MeO-BINAP) } 2 (μ-Cl) 3 ] (( R )- 2 ), whose structure has been determined by an X-ray crystallographic study. Complex 2 is an efficient catalyst for asymmetric hydrogenation of functionalized olefins and ketones.