Single‐Electron Oxidation of Tungsten Acetylide Complexes [(η5‐C5H5)(CO)(NO)W–C≡C–R]Li

The reaction of a tungsten acetylide complex [(η5-C5H5)(CO)(NO)W–C≡C–R]Li (1) [1a, R = C6H5; 1b, R = C(CH3)3; 1c, R = Si(CH3)3] with one equivalent of ferrocenium tetrafluoroborate [Cp2Fe][BF4], acting as a one-electron oxidant in THF at –50 °C, leads to the bimetallic tungsten–alkynyl complexes [(η5-C5H5)(NO)W–C≡C–R]2 (9) [9a, R = C6H5; 9b, R = C(CH3)3; 9c, R = Si(CH3)3] as pale-orange crystals. The crystal structure of complex 9a is reported. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)