r-np-tbu;]-2-(DI-1-NAPHTHAL;(R)-1-[(Sp)-2-(Di-1-naphtylphosphino)ferrocenyl]ethyldi-t-butylphosphine;(R)-1-[(S)-2-(Di-1-naphtylphosphino)ferrocenyl]-ethyl-di-tert-butylphosphine;(R)-1-{(SP)-2-[Di(1-naphthyl)phosphino]ferrocenyl}ethyldi-tert-butylphosphine;(r,r)-1-[1-(di-tert-butylphosphino)ethyl]-2-[di(1-naphthyl)phosphino]ferrocene (acc to cas);(2R)-1-[(1R)-1-[BIS(1,1-DIMETHYLETHYL)PHOSPHINO]ETHYL]-2-(DI-1-NAPHTHALENYLPHOSPHINO)FERROCENE;(2Sp)-1-[(1R)-1-[Bis(1,1-dimethylethyl)phosphino]ethyl]-2-(di-1-naphthalenylphosphino)ferrocene;(1R)-3-[bis(1-naphthyl)phosphanyl]-4-[(1R)-1-ditert-butylphosphanylethyl]cyclopenta-2,4-dien-1-yl]-cyclopenta-2,4-dien-1-yl-iron