Fusion of a 1,3-Diboraruthenocene to Form a Slipped mu-Hexahydro-tetraborahaphthalene Triple-Decker Complex with Two Axial C-H Bonds

摘要

Numerous complexes with three-center, two-electron C-H-M interactions have been investigated by X-ray and neutron diffraction, and by NMR spectroscopy.Long C-H bonds in complexes such as [{Ta(CHCMe3)(PMe3)Cl3}2], [{(MeO)3P}3Fe(eta~3-C8H_(13))]~+, and [(eta~3-6-endo-Me-C6H9)-Mn(CO)3] indicate agostic bonding.A different kind of 3c,2e bonding involving C-H bonds was found in cobalt 2,3-dihydro-l,3-diborole complexes in which the endo hydrogen atom at the pentacoordinate carbon of the MeC*-H group could be in a bridging(C*-H-B)or in an axial(Co-C*-H)position.