95029-83-7Relevant academic research and scientific papers
Chemistry of Di- and Tri-metal Complexes with Bridging Carbene or Carbyne Ligands. Part 32. Reactions of the Rhodium-Tungsten Complex with Alkynes; X-Ray Crystal Structure of
Green, Michael,Howard, Judith A. K.,Porter, Simon J.,Stone, F. Gordon A.,Tyler, David C.
, p. 2553 - 2560 (2007/10/02)
The bimetal compound (R= C6H4Me-4, C9H7= indenyl) reacts with the alkynes R1CCR2 (R1= R2= Ph or Me; R1=Ph, R2= H or Me) in toluene at ca. 50-80 deg C to give the bridged complexes .The molecular structure of the species obtained from PhCCPh was established by a single-crystal X-ray diffraction study.A Rh-W bond is bridged by a three-carbon chain .Whereas all the atoms of the chain are bound to the rhodium , only two end carbons are attached to the tungsten .The tungsten atom carries two essentially orthogonal terminal carbonyl groups, as well as the cyclopentadienyl ring.The indenyl group is asymmetrically attached to the rhodium atom, with three short Rh-C and two long Rh-C separations to the C5 ring, implying slippage towards an η3-bonding mode.Formation of from and PhCCPh requires forcing conditions (100 deg C, 5 d in toluene), and side-reactions occur to yield hexaphenylbenzene, , and the tetraphenylcyclopentadienone complex .The reaction between and CR)(CO)2(η-C5H5)> has also been investigated.With heptane as solvent, the products are the trimetal complex 3-CR)(μ-CO)(CO)2(η-C5H5)(η-C9H7)2>, the alkyne-bridged complex , and a compound formulated as .Spectroscopic data (i.r., 1H and 13C-(1H) n.m.r.) for the new compounds are reported and discussed.
