112019-12-2Relevant articles and documents
BINAP-ruthenium(II) dicarboxylate complexes: New, highly efficient catalysts for asymmetric hydrogenations
Ohta, Tetsuo,Takaya, Hidemasa,Noyori, Ryoji
, p. 566 - 569 (2008/10/08)
The BINAP-ruthenium(II) complexes Ru(OCOR)2[(R)- or (S)2,2′-bis(diarylphosphino)-1,1′-binaphthyl] [aryl = phenyl, p-tolyl; R = CH3, C(CH3)3] have been prepared. The crystal structure of Ru[OCOC(CH3)3] 2[(S)-2,2′-bis(diphenylphosphino)-1,1′-binaphthyl], determined by X-ray crystallography [diffraction data collected at -60°C, formula C54H50O4P2Ru, monoclinic, space group P21, Z = 2, a = 13.272 (2) A?, b = 16.224 (3) A?, c = 12.701 (2) A?, β = 124.34 (1)°, R = 0.037, Rw = 0.043], indicates that the monomeric ruthenium(II) complex has a distorted octahedron coordination geometry involving two phosphorus atoms of BINAP and four oxygen atoms of pivalate ligands. The complex has a Λ structure, while the BINAP-containing seven-membered chelate ring is fixed in a δ conformation. The molecular structure has been compared with that of Rh[(R)-BINAP](norbornadiene)ClO4. These BINAP-ruthenium complexes serve as highly efficient catalysts for asymmetric hydrogenations of various enamides, α-(acylamino)acrylic acids, α,β- and β,γ-unsaturated carboxylic acids, allylic and homoallylic alcohols, α-amino ketones, etc.