Solvates of Manganese Trichloride Revisited – Synthesis, Isolation, and Crystal Structure of MnCl 3 (THF) 3

The syntheses and crystal structures of [MnCl 3 (H 2 O)(THF) 2 ] · 2THF ( I ), [MnCl 4 (THF) 2 ][H(THF) 2 ] ( II ), and [MnCl 3 (THF) 3 ] ( III ) are reported. This study shows that former assumptions about the preparation of anhydrous MnCl 3 and its etherates, published in the 1960s and earlier, have to be questioned. Instead of the conventional manganese sources, MnF 3 was successfully utilized as starting material in THF to give water‐free MnCl 3 etherates. These findings are vital for further reactions where reactive but anhydrous MnCl 3 derivatives are needed.