η2 Complexes of Cyclic Polyolefins: Crystal Structure of 2-C8H8)(η-C5H5)>

Article abstract of DOI:10.1039/DT9810000051

Treatment of (thf = tetrahydrofuran) with cyclo-octatetraene produces 2-C8H8)(η-C5H5)>, whose structure was determined by X-ray-diffraction.Crystals are monoclinic, space group P2₁/c, with four molecules in a unit cell of dimensions a=10.813(7), b=6.606(4), c=17.164(9) Angstroem, β=94.68(5)deg.The structure was solved by conventional techniques and refined by least squares to R 0.034 for 2 787 independent diffracted intensities.The molecule contains an η²-cyclo-octatetraene ligand which possesses mirror symmetry and presents the convex face of a tub conformation towards the cyclopentadienyl ring.Nuclear magnetic resonance spectra show that the complex is non-fluxional below the temperature (ca.75 deg C) at which it decomposes to the dimanganese μ-cyclo-octatetraene complex <2(μ-C8H8)>.The η²-cyclo-octatetraene is readily displaced by phosphine ligands.Analogous η²-olefin complexes of manganese are obtained from cycloheptatriene and cyclo-octa-1,3,6-triene.

Full text of DOI:10.1039/DT9810000051

View Article Online / Journal Homepage / Table of Contents for this issue

View Article Online

View Article Online

View Article Online

View Article Online