for the following products
(R)-(-)-1-[(S)-2-(Diphenylphosphino)ferrocenyl]ethyldi(3,5-dimethylphenyl)phosphine | 1-[(1R)-1-[bis-(3,5-Dimethylphenyl)phosphino]ethyl]-2-(diphenylphosphino)-ferrocene(2R)- and (R)-1-[(Sp)-2-(diphenylphosphino)ferrocenyl]ethyldi(3,5-xylyl)phosphine
