Abstract
( R, R)-[(2,2-dimethyl-1,3-dioxolane-4,5-diyl)bis(methylene)]bis[diethylphosphine] (Etdiop) and ( R, R)-[(2,2-dimethyl-1,3-dioxolane-4,5-diyl)bis(methylene)]bis[dicyclohexylphosphine] (Cydiop) have been used as chiral ligand in the rhodium- and in the platinum-catalyzed hydroformylations of some olefinic substrates. These ligands bring about a loss of catalytic activity with respect to the corresponding diphenylphosphine homologue, particularly in the case of the platinum systems. The regioselectivity favours the straight-chain (or less branched) isomer in the case of terminal olefins with the exception of styrene; for this substrate the rhodium-catalyzed reaction with the Etdiop ligand is completely regioselective and gives only hydratropaldehyde. The enantioselectivity is very low in all cases examined.
Published Version
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