cis-tetracarbonylbis(pyrazine)tungsten(0) | 897939-15-0

• 英文名称: cis-tetracarbonylbis(pyrazine)tungsten(0)
• CAS: 897939-15-0
• 化学式: C₁₂H₈N₄O₄W
• 分子量: 456.07
• InChiKey: WUZNCPLSQHGRFX-UHFFFAOYSA-N

反应信息

• 作为产物：
  描述：

  吡嗪 、 cis-(tungsten tetracarbonyl bipiperidine) 以 二氯甲烷 为溶剂， 生成 cis-tetracarbonylbis(pyrazine)tungsten(0)
  参考文献：
  名称：

  A stable carbonyl–pyrazine–metal(0) complex: Synthesis and characterization of cis-tetracarbonylpyrazinetrimethylphosphitetungsten(0)

  摘要：

  Pentacarbonylpyrazinetungsten(0), (CO)(5)W(pyz), is not stable in solution in polar solvents such as acetone or dichloromethane and undergoes conversion to a bimetallic complex, (CO)(5)W(pyz)W(CO)(5) plus free pyrazine. These three species exist at equilibrium. Using the quantitative H-1 NMR spectroscopy, the equilibrium constant could be determined to be K-eq = (5.9 +/- 0.8) x 10(-2) at 25 degrees C. Introducing a second pyrazine ligand into the molecule does not stabilize the complex, as CiS-W(CO)(4)(pyz)(2) was found to be less stable than W(CO)(5)(pyz) and, therefore, could not be isolated. However, introducing trimethylphosphite as a donor ligand into the complex leads to the stabilization of the carbonyl-pyrazine-metal(0) complexes, as shown by the synthesis Of CiS-W(CO)(4)[P(OCH3)(3)](pyz). This complex could be isolated from the reaction of the photogenerated W(CO)(4)[P(OCH3)(3)](tetrahydrofuran) with trimethylphosphite upon mixing for 2 h at 10 degrees C in tetrahydrofuran and characterized by elemental analysis, IR, MS, H-1, C-13 and P-31 NMR spectroscopy. (c) 2006 Elsevier B.V. All rights reserved.

  DOI：

  10.1016/j.jorganchem.2006.02.005