Diverse Reactivity of ECp* (E = Al, Ga) toward Low-Coordinate Transition Metal Amides [TM(N(SiMe3)2)2] (TM = Fe, Co, Zn): Insertion, Cp* Transfer, and Orthometalation.

Diverse Reactivity of ECp* (E = Al, Ga) toward Low-Coordinate Transition Metal Amides [TM(N(SiMe3)2)2] (TM = Fe, Co, Zn): Insertion, Cp* Transfer, and Orthometalation.
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ECp* (E = Al, Ga) 对低配位过渡金属酰胺 [TM(N(SiMe3)2)2] (TM = Fe, Co, Zn) 的多种反应性:插入、Cp* 转移和邻位金属化

DOI:
10.1021/acs.inorgchem.6b03127
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发表时间:
2017
影响因子:
4.6
通讯作者:
R. A. Fischer
R. A. Fischer
中科院分区:
化学2区
文献类型:
--
作者:
J. Weßing;C. Göbel;B. Weber;C. Gemel;R. A. Fischer

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研究了类胡萝卜素第 13 族金属配体 ECp* (E = Al, Ga) 对低价过渡金属配合物 [TM(btsa)2](TM = Fe, Co, Zn;btsa = 双(三甲基硅基)酰胺)的反应性,揭示了 E = Al 和 Ga 完全不同的反应模式。用 AlCp* 处理 [Co(btsa)2] 产率[Cp*Co(μ-H)(Al(κ2-(CH2SiMe2)NSiMe3)(btsa))] (1) 具有不寻常的异金属双环结构,该结构是由于 AlCp* 插入 TM-N 键中并伴随配体重排(包括一个酰胺配体处的 C-H 激活)而产生的。对于 [Fe(btsa)2],完全配体交换得到 FeCp*2,无论反应物采用的化学计量比如何。相反,用 GaCp* 处理 [TM(btsa)2] (TM = Fe, Co) 分别形成 1:1 和 1:2 加合物 [(GaCp*)Co(btsa)2] (2) 和 [(GaCp*)2Fe(btsa)2] (3)。 AlCp* 进行 Cp* 转移到 TM 中心的趋势似乎取决于 TM 中心的性质:对于 [Zn(btsa)2],与 AlCp* 反应时没有观察到 Cp* 转移;相反,形成插入产物 [Zn(Al(η2-Cp*)(btsa))2] (4)。在 [Co(btsa)2] 与三价 [Cp*AlH2] 的反应中,观察到酰胺配体的转移,而没有进一步的配体重排,从而生成 [Co(μ-H)4(Al(η2-Cp*)(btsa))2] (5)。
The reactivity of the carbenoid group 13 metal ligands ECp* (E = Al, Ga) toward low valent transition metal complexes [TM(btsa)2] (TM = Fe, Co, Zn; btsa = bis(trimethylsilyl)amide) was investigated, revealing entirely different reaction patterns for E = Al and Ga. Treatment of [Co(btsa)2] with AlCp* yields [Cp*Co(μ-H)(Al(κ2-(CH2SiMe2)NSiMe3)(btsa))] (1) featuring an unusual heterometallic bicyclic structure that results from the insertion of AlCp* into the TM–N bond with concomitant ligand rearrangement including C−H activation at one amide ligand. For [Fe(btsa)2], complete ligand exchange gives FeCp*2, irrespective of the employed stoichiometric ratio of the reactants. In contrast, treatment of [TM(btsa)2] (TM = Fe, Co) with GaCp* forms the 1:1 and 1:2 adducts [(GaCp*)Co(btsa)2] (2) and [(GaCp*)2Fe(btsa)2] (3), respectively. The tendency of AlCp* to undergo Cp* transfer to the TM center appears to be dependent on the nature of the TM center: For [Zn(btsa)2], no Cp* transfer is observed on reaction with AlCp*; instead, the insertion product [Zn(Al(η2-Cp*)(btsa))2] (4) is formed. In the reaction of [Co(btsa)2] with the trivalent [Cp*AlH2], transfer of the amide ligands without further ligand rearrangement is observed, leading to [Co(μ-H)4(Al(η2-Cp*)(btsa))2] (5).
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