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In the reaction of C 5 H 5 Fe(CO) 2 l and C 5 H 5 Fe(CO) 2 CH 3 , respectively, with S-(+)-(C 6 H 5 ) 2 PN(CH 3 )CH(CH 3 )(C 6 H 5 ) (abbreviated P∅ 2 R*) the complexes C 5 H 5 Fe(CO)(P∅ 2 R*)I (1), C 5 H 5 Fe(CO)(P∅ 2 R*)COCH 3  (2), and C 5 H 5 Fe(CO)(P∅ 2 R*)CH3 (3) are formed as pairs of diastereoisomers the components of which differ only in the configu­ration at the iron atom. CsH 5 Fe(CO)(P∅ 2 R*)CH 3  (3) can be obtained in higher yield by photochemical decarbonylation of C 5 H 5 Fe(CO)(P∅ 2 R*)COCH 3  (2). The (+)365- and (-)365-diastereoisomers of each pair exhibit different chemical shifts in the  1 H NMR spectra. Diastereoisomer separation can be achieved by fractional crystallization.

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Optisch aktive Übergangsmetall-Komplexe, LVII [1] (+)- und (-)-C 5 H 5 M(CO)(P∅ 2 R*)X mit M = Fe,  57 Fe und X = I, COCH 3 , CH 3  / Optically Active Transition Metal Complexes, L   VII [1] (+)- and (-)-C 5 H 5 M(CO)(P∅ 2 R*)X with M = Fe,  57 Fe, and X = I, COCH 3 , CH 3