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In the reaction of [C 5 H 5 Mn(NO)(CO)PN*]PF 6  (1) with LiC 6 H 5  5-exo-C 6 H 5 C 5 H 5 Mn(NO)-(CO)PN* (2) and C 5 H 5 Mn(NO)(COC 6 H 5 )PN* (3) are formed. If the reaction is carried out with optically active starting material 1 the optically active ring addition and benzoyl compounds 2 and 8 resp., are obtained. Whereas the ring addition product 2 is configurationally stable, the benzoyl complex 3 in solution epimerizes according to 1 st  order kinetics. The change of configuration at the Mn atom occurs by PN* dissociation with formation of a chiral intermediate. This is demonstrated by the fact that exchange of PN* in (-) 578 -C 5 H 5 Mn(NO)(COC 6 H 5 )PN* (1a) with P(OC 2 H 5 ) 3  gives (+) 578 -C 5 H 5 Mn(NO)-(COC 6 H 5 )P(OC 2 H 5 ) 3  (4a), a reaction proceeding with retention of configuration at the metal atom

zeitschrift für naturforschung b

Optisch aktive Übergangsmetall-Komplexe, XLIII. (—) 578 -C 5 H 5 Mn(NO)(COC 6 H 5 )PN. Darstellung, Epimerisierung und Stereochemie des Ligandenaustauschs.: Optically Active Transition Metal Complexes, XLIII. (—) 578 -C 5 H 5 Mn(NO)(COC 6 H 5 )PN. Preparation, Epimerization and Stereochemistry of Ligand Exchange