(S)-1-{(SP)-2-[2-(Diphenylphosphino)phenyl]ferrocenyl}ethyldicyclohexylphosphine;(S)-1-{(SP)-2-[2-(Diphenylphosphino)phenyl]ferrocenyl}ethyldicyclohexylphosphine >=97%;(s,s)-1-[1-(dicyclohexylphosphino)ethyl]-2-[2-(diphenylphosphino)phenyl]ferrocene (acc to cas)