Abstract
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 enantioselective rhodium diphosphine catalyst (27% e.e.) up to now has been found.
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