[Pd(μ-Br)Br(1-butyl-3-methylimidazol-2-ylidene)]2 | 263370-05-4

• 英文名称: [Pd(μ-Br)Br(1-butyl-3-methylimidazol-2-ylidene)]2
• 英文别名: [PdBr(μ-Br)(1-butyl-3-methylimidazol-2-ylidene)]2；[Pd(μ-Br)Br(1-butyl-3-methylimidazol-2-ylidene)]₂
• CAS: 263370-05-4
• 化学式: C₁₆H₂₈Br₄N₄Pd₂
• 分子量: 808.881
• InChiKey: MMEATMFKLRWPSC-UHFFFAOYSA-J

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：

  palladium diacetate 、 1-丁基-3-甲基咪唑溴盐 以 neat (no solvent) 为溶剂， 反应 1.5h， 以45%的产率得到[Pd(μ-Br)Br(1-butyl-3-methylimidazol-2-ylidene)]2
  参考文献：
  名称：

  Recyclable Pd(0)-Pd(II) composites formed from Pd(II) dimers with NHC ligands under Suzuki–Miyaura conditions

  摘要：

  Dimeric complexes of the type [Pd(mu-X)X(NHC)](2) were employed in the Suzuki-Miyaura cross-coupling leading to 2-methylbiphenyl. The excellent activity of the studied dimers is perfectly illustrated by a TOF of up to 10(6) h(-1). Mechanistic investigations with the application of TEM, XPS, and mercury poisoning tests provided an insight into the nature of the catalytic process. Accordingly, the reduction of the dimeric palladium complex [Pd(mu-X)X(NHC)](2) resulted in the formation of a composite containing Pd(0) nanoparticles protected by a layer of a Pd(II) species such as anions [PdBr4](2-) or [PdBr3(NHC)](-). The in situ formation of Pd(0)-Pd(II) composites resulted in the high stability of the catalytic system, which was active in ten subsequent recycles without any additional protection. (C) 2015 Elsevier BY. All rights reserved.

  DOI：

  10.1016/j.jorganchem.2015.03.009

文献信息

• Heck Reaction in Ionic Liquids and the in Situ Identification of <i>N-</i>Heterocyclic Carbene Complexes of Palladium
  作者：Lijin Xu、Weiping Chen、Jianliang Xiao

  DOI：10.1021/om990956m

  日期：2000.3.1

  The Heck reaction was found to proceed markedly more efficiently in the ionic liquid 1-butyl-3-methylimidazolium bromide ([bmim][Br]) than in the analogous tetrafluoroborate salt ([bmim][BF4]). In relation to this observation, 1-butyl-3-methylimidazol-2-ylidene (bmiy) complexes of palladium [PdBr(mu-Br)(bmiy)](2) (1) and [PdBr2(bmiy)(2)] (2) have been isolated in [bmim][Br] but not in [bmim][BF4] under conditions similar to those employed for the Heck reaction. In both the ionic liquid [bmim][Br] and molecular solvents, complex 2 was formed via the intermediate 1. 2 has been shown to be active in the Heck reaction in [bmim][Br] but much less so in [bmim][BF4] due to transformation by the latter into less active species.