STEREOSELECTIVE ADDITION OF CYANIDE ION TO CHIRAL RHENIUM ?-ALDEHYDE COMPLEXES OF THE FORMULAE 5-C5H5)Re(NO)(PPh3)(η2-O=CHR)>+ BF4-; A NEW SYNTHESYS OF OPTICALLY ACTIVE CYANOHYDRIN DERIVATIVES

Article abstract of DOI:10.1016/S0040-4039(00)99287-6

Reaction of optically active aldehyde complexes (+)-(RS)-<(η⁵-C5H5)Re(NO)(PPh3)(η²-O=CHR)>⁺ BF4^- and (CH3CH2)4N⁺ CN^- gives cyanohydrin alkoxide complexes (+)-(η⁵-C5H5)Re(NO)(PPh3)(OCH(CN)R) (78-95percent) of 89-53percent de.The alkoxide ligands are then converted to optically active MTPA esters (96-85percent) of 90-56percent de.