ETA(6)-HYDROQUINONE AND CATECHOL COMPLEXES OF MANGANESE TRICARBONYL -MOLECULAR-STRUCTURE OF [(ETA(6)-HYDROQUINONE) MN(CO)(3)]2SIF6

The reaction of (eta(6)-acenaphthene)Mn(CO)(3)(+) with hydroquinone an d catechol affords the stable pi-bonded complexes (eta(6)-hydroquinone )Mn(CO)(3)(+) (1) and (eta(6)-catechol)Mn(CO)(3)(+) (2). The X-ray str ucture of [1]2SiF6 shows an approximately planar arene ligand with the -OH substituents strongly hydrogen bonded to fluorine atoms in the Si F62- anion. Deprotonation of 1 and 2 by NEt(3) yields the correspondin g pi-bonded semiquinone complexes.