1) Senegalese surname 
DIOP (2,3-O-isopropylidene-2,3-dihydroxy-1,4-bis(diphenylphosphino)butane) is an organophosphorus compound that is used as a chiral ligand in asymmetric catalysis. It is a white solid that is soluble in organic solvents. ==Synthesis== DIOP is prepared from the acetonide of d,l-tartaric acid, which is reduced prior to attachment of the PPh2 substit...