Chelate Complexes of Functionalized Cycloheptatrienyl Ligands: Molybdenum Complexes with Linked Cycloheptatrienyl‐Phosphane Ligands and Their Use in Catalytic Carbon−Carbon Bond Formation
The synthesis of P-functionalized molybdenum chelate complexes incorporating the linked cycloheptatrienyl-phosphane ligand [2-(diisopropylphosphanyl)phenyl]cycloheptatrienyl (o-iPr2P−C6H4−C7H6) is described. From the ligand precursor [2-(cyclohepta-2,4,6-trienyl)phenyl]diisopropylphosphane (1) the paramagnetic 17-electron dibromide [(o-iPr2PC6H4-η7-C7H6)MoBr2(P−Mo)] (2) can readily be obtained. This
Synthesis and structural characterization of molybdenum complexes with linked cycloheptatrienyl–phosphane ligands
作者:Matthias Tamm、Bernd Dreßel、Kim Baum、Thomas Lügger、Tania Pape
DOI:10.1016/s0022-328x(03)00318-8
日期:2003.7
eight-electron ligand to afford the cycloheptatriene–phosphane chelate complex [(o-iPr2PC6H4η6-C7H7)Mo(CO)2(PMo)] (3b) as a single, chiral regioisomer, which undergoes clean hydride abstraction on treatment with (Ph3C)BF4. The resulting cationic complex 4b reacts with sodium bromide to yield the ‘chiral-at-metal’ complex [(o-iPr2PC6H4η7-C7H6)Mo(CO)Br(PMo)] (5b). This 18-electron complex can be oxidized