Derivate des Borols. XIII. (η5-Borol)eisen-Komplexe und (η5-Borol)-(η5-cyclopentadienyl)metallhydride von Eisen, Ruthenium und Osmium

Article abstract of DOI:10.1016/0022-328X(89)87245-6

The η⁵-borole complexes (C4H4BR)Fe(CO)3 (Ia: R=Ph; Ib: R=Me) yield a large variety of substitution products when irradiated in the presence of suitable ligands, thus affording the derivatives (C4H4BR)Fe(CO)2L (for R=Me: L=PMe3, for R=Ph: L=CNBu^t, NCMe, PMe3), (C4H4BR)Fe(CO)(PMe3)2 (R=Me, Ph), and (C4H4BPh)Fe(CO)L (L=butadiene, cyclopentadiene, 1,3-cyclohexadiene, 1,5-cyclooctadiene, trans-PhCH=CHCOMe).Exhaustive decarboxylation produces the basic (C4H4BPh)Fe(PMe3)3, the benzene complex (C4H4BPh)Fe(C6H6), and hydrides (C4H4BR)FeHCp (R=Me, Ph) which are both non-rigid at low temperature (-80 deg C), and show a novel intramolecular proton exchange between Fe-H and H(2/5) above room temperature. (C4H4BPh)FeHCp is readily deprotonated to give a borataferrocene anion which can be isolated as the (TMEDA)Li derivative and can form the triple-decked μ-(C4H4BPh)(FeCp).Homologous hydrides (C4H4BPh)MHCp (M=Ru, Os) can also be made photochemically from the tricarbonyls and cyclopentadiene.