Journal of Molecular Catalysis A-Chemical, Vol.174, No.1-2, 119-126, 2001
Asymmetric hydroformylation and hydrogenation catalyzed by chiral rhodium and ruthenium complexes of phosphorylated 2,2'-bis(diphenyl-phosphino)-1,1'-binaphthyls
In situ-generated rhodium complexes of mono- and bisphosphorylated enantiopure BINAP ligands have been used for the asymmetric hydroformylation of styrene and vinylacetate. Corresponding Ru-complexes have been investigated in the homogeneous and biphasic asymmetric hydrogenation of dimethyl itaconate. An increase in the enantioselectivity of about 6-9% compared to BINAP was observed in the vinylacetate hydroformylation. For the aqueous biphasic hydroformylation of styrene the most enantio selective rhodium diphosphine catalyst (27% e.e.) up to now has been found.
Keywords:asymmetric hydroformylation;asymmetric hydrogenation;rhodium;ruthenium;aqueous biphasic catalysis