[(μ-η5-C5H4PPh2)Cr(CO)2]2 | 205054-50-8

• 英文名称: [(μ-η5-C5H4PPh2)Cr(CO)2]2
• CAS: 205054-50-8
• 化学式: C₃₈H₂₈Cr₂O₄P₂
• 分子量: 714.577
• InChiKey: KXWQQVGEUCQCTC-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
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• 重原子数：
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• 可旋转键数：
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• 环数：
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• sp3杂化的碳原子比例：
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• 拓扑面积：
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• 氢给体数：
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• 氢受体数：
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反应信息

• 作为产物：
  描述：

  [(μ-η5-C5H4PPh2)Cr(CO)3Ag]2 以 甲苯 为溶剂， 生成 [(μ-η5-C5H4PPh2)Cr(CO)2]2
  参考文献：
  名称：

  官能化的环戊二烯基配体的过渡金属衍生物。十六。的合成桥配合物[（μ-η 5 -C 5 H ^ 4 PPH 2）M（CO）2 ] 2（M =铬，钼，W）。的二氢化衍生物的X射线晶体结构[（μ-η 5 -C 5 H ^ 4 PPH 2）W（CO）2 H] 2

  摘要：

  Four synthetical methods, implying basically the oxidation of the anionic species [(eta(5)-C5H4PPh2)M(CO)(3)](-) [M = Cr, (2a(-)), Mo (2b(-)), W (2c(-))] to produce the new homobimetallic derivatives [(mu,eta(5)-C5H4PPh2)M(CO)(2)](2) (M-M), [M = Cr (1a), Mo (1b), W (1c)] of the heterodifunctional diphenylphosphinocyclopentadienyl bridging ligand, have been investigated. The first approach proceeds in two steps: thus the electrochemical oxidation of the complexes 2a(-) and 2b(-) leads to the metal-metal bonded dimetallic complexes [(eta(5)-C5H4PPh2)M(CO)(3)](2) (M-M), [M = Cr (5a), Mo (5b)]; the irradiation of these complexes 5a and 5b with a high-pressure Hg lamp affords the corresponding decarbonylated bridged complexes 1a and 1b. The second method, using silver tetrafluoroborate as the oxidant of the anions 2a(-) to 2c(-), leads to the formation of tetrametallic cyclic complexes of silver and Group 6 transition metals [(mu-eta(5)-C5H4PPh2[M(CO)(3)Ag](2), [M = Cr (6a), Mo (6b), W (6c)] but the splitting of these compounds into bimetallic complexes 1a-c and metallic silver appears neither easy nor selective. As a third procedure, the hydride complexes (eta(5)-C5H4PPh2)M(CO)(3)H [M = Cr (3a), Mo (3b), W (3c)] are irradiated with a high-pressure Hg lamp. This procedure is useful to prepare Ib but is non-selective in the two other cases, affording mainly bimetallic dihydrido-bridged complexes [(mu-eta(5)-C5H4PPh2)M(CO)(2)H](2) [M = Mo (7b), W (7c)] and 1a or 1b, as a result of the expected competition between the dehydrogenation and the decarbonylation processes. The X-ray molecular structure of 7c points out the transoid disposition of the hydride ligands, which could well be a factor of its inertness in a spontaneous dehydrogenation process towards 1c. Finally, the most efficient method requires the preliminary preparation of the iodo complexes (eta(5)-C5H4PPh2)M(CO)(3)I [M = Cr (4a), Mo (4b), W (4c)], which are reacted in toluene with their anionic parents 2(-). This last method is particularly useful for preparing 1a and 1c.

  DOI：

  10.1039/a706746a