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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Oxygen extrusion from amidate ligands to generate terminal TaO units under reducing conditions. How to successfully use amidate ligands in dinitrogen coordination chemistry
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Oxygen extrusion from amidate ligands to generate terminal TaO units under reducing conditions. How to successfully use amidate ligands in dinitrogen coordination chemistry

机译:从酰胺化物配体中挤出氧气,以在还原条件下生成末端TaO单元。如何在二氮配位化学中成功使用酰胺化物配体

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A series of mixed Cp* amidate tantalum complexes Cp*Ta(RNC(O) R′)X _3 (where R = Me _2C _6H _3, ~iPr, R′ = tBu, Ph, X = Cl, Me) have been prepared via salt metathesis and their fundamental reactivities under reducing conditions have been explored. Reaction of the tantalum chloro precursors with potassium graphite under N _2 or Ar leads to the stereoselective formation of the terminal tantalum oxo species, Cp*TaO(η ~2-RNCR′)Cl. This represents the formal extrusion of oxygen from the amidate ligand to the reduced tantalum center and is accompanied by the formation of the iminoacyl fragment bound to Ta(v). Amidate dinitrogen complexes, [Cp*TaCl(RNC(O) ~tBu)] _2(μ-N _2) (where R = Me _2C _6H _3, ~iPr) were synthesized via salt metathesis from the known [Cp*TaCl _2] _2(μ-N _2) precursor, establishing that amidate ligands can support dinitrogen complexes, but not the reduction process often necessary for their synthesis.
机译:已经制备了一系列混合的Cp *酰胺酸钽配合物Cp * Ta(RNC(O)R')X _3(其中R = Me _2C _6H _3,〜iPr,R'= tBu,Ph,X = Cl,Me)通过盐复分解及其在还原条件下的基本反应性已被探索。在N _2或Ar下,钽的氯代前体与钾石墨的反应导致末端钽的oxo物种Cp * TaO(η〜2-RNCR')Cl的立体选择性形成。这表示氧从酰胺化物配体到还原的钽中心的形式上的正式挤出,并伴随着与Ta(v)结合的亚氨基酰基片段的形成。酰胺盐二氮配合物[Cp * TaCl(RNC(O)〜tBu)] _2(μ-N_2)(其中R = Me _2C _6H _3,〜iPr)通过已知的[Cp * TaCl _2]盐复分解合成。 _2(μ-N_2)的前体,表明酰胺化物配体可以支持二氮配合物,但不是合成通常所需的还原过程。

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