Manganese-sigma-Borane Complexes from Dihaloboranes

The hydride complex K[(eta(5)-C5H5)Mn(CO)(2)H] reacted with a range of dihalo(organyl)boranes X2BR (X = Cl, Br; R = tBu, Mes, Ferrocenyl) to give the corresponding borane complexes [(eta(5)-C5H5)Mn(CO)(2)(HB(X)R)]. The presence of a hydride in bridging position between manganese and boron was deduced from B-11 decoupled H-1 NMR spectra. Additionally, the structure of the tert-butyl borane complex was confirmed by single-crystal X-ray diffraction.