(R)1[(1S)2(di-C-hexylphosphino)ferrocen. ]et-diphenylphosphin; (R)-1-[(1S)-2-(Dicyclohexylphosphino)ferrocenyl]ethyldi-phenylphosphine; 1,2,3,4,5-cyclopentanepentayl, compd. with 1-(dicyclohexylphosphino)-2-[(1R)-1-(diphenylphosphino)ethyl]-1,2,3,4,5-cyclopentanepentayl, iron salt (1:1:1)