TMEDA Adducts of CpMnCl and Manganocene

The base‐stabilized manganese(II) half‐sandwich complex 1, the first unsubstituted cyclopentadienylmanganese(II) halide, was synthesized via the route depicted below. 1 could find wide application as a CpMn transfer agent, e.g. for the synthesis of unsymmetrical sandwich compounds, especially “mixed” manganocenes, which should enable a detailed study of the high‐spin—low‐spin equilibrium. The thermolysis of 1 leads to Cp2Mn(TMEDA), the first Mn11 compound known to contain a η5‐ and a η1‐ligand (TMEDA Me2NCH2CH2NMe2, Cp  C5H5). equation image