Synthesis of Manganese and Rhenium Half-Sandwich Complexes with Cp-Phosphaferrocene Ligands

The phosphaferrocene-substituted Cp anion
1 has been used to prepare the tricarbonyl half-sandwich
complexes 1·M(CO)3 (2, M = Mn; 3, M = Re), which
release one CO ligand upon irradiation and transform
to the respective dicarbonyl complexes 4 and 5 with the
phosphaferrocene donor group coordinated in an intramolecular chelating manner. Due to the chirality of
the phosphaferrocene moiety, subsequent photolytic substitution of a further CO ligand in the manganese
complex 4 by a PPh3 leads to a 11:1 mixture of
diastereomers of the monocarbonyl complex 6.