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首页> 外文期刊>Zeitschrift fur Anorganische und Allgemeine Chemie >Nickel Tetracarbonyl as Starting Material for the Synthesis of NHC-stabilized Nickel(II) Allyl Complexes
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Nickel Tetracarbonyl as Starting Material for the Synthesis of NHC-stabilized Nickel(II) Allyl Complexes

机译:镍四羰基作为合成NHC稳定的镍(II)烯丙基配合物的原料

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摘要

A novel, useful in situ synthesis for NHC nickel allyl halide complexes [Ni(NHC)(η~3-allyl)(X)] starting from [Ni(CO)_4], NHC and allyl halides is presented. The reaction of [Ni(CO)_4] with (i) one equivalent of the corresponding NHC and (ii) with an excess of the corresponding allyl chloride at room temperature leads with elimination of carbon monoxide to complexes of the type [Ni(NHC)(η~3-allyl)(X)]. This approach was used to synthesize the complexes [Ni(tBu_2Im)(η~3- H_2C-C(Me)-CH_2)(Cl)] (2), [Ni(iPr_2Im~(Me))(η~3-H_2C-C(Me)-CH_2)(Cl)] (3), [Ni(iPr_2Im)(η~3-H_2C-C(Me)-CH_2)(Cl)] (4), [Ni(iPr_2Im)(η~3- H_2C-C(H)-C(Me)_2)(Br)] (5), [Ni(Me_2Im~(Me))(η~3-H_2C-C(Me)-CH_2)(Cl)] (6), and [Ni(EtiPrIm~(Me))(η~3-H_2C-C(Me)-CH_2)(Cl)] (7). The complexes 1 to 7 were characterized using NMR and IR spectroscopy and elemental analysis, and the molecular structures are provided for 2 and 7. The allyl nickel complexes 1-7 are stereochemically non-rigid in solution due to (i) NHC rotation about the nickel-carbon bond, (ii) allyl rotation about the Ni-η~3-allyl axis and (iii) π-σ-π allyl isomerization processes. The allyl halide complexes can be methylated as was demonstrated by the methylation of a number of the complexes [Ni(NHC) (η~3-allyl)(X)] with methylmagnesium chloride or methyllithium, which led to isolation of the complexes [Ni(Me_2Im)(η~3-H_2C-C(Me)-CH_2) (Me)] (8), [Ni(tBu_2Im)(η~3-H_2C-C(Me)-CH_2)(Me)] (9), [Ni(iPr_2Im~(Me)) (η~3-H_2C-C(Me)-CH_2)(Me)] (10), [Ni(iPr_2Im)(η~3-H_2C-C(Me)-CH_2) (Me)] (11), [Ni(iPr_2Im)(η~3-H_2C-C(H)-C(Me)_2)(Me)] (12), and [Ni(EtiPrIm~(Me))(η~3-H_2C-C(Me)-CH_2)(Me)] (13). These complexes were fully characterized including X-ray molecular structures for 10 and 11.
机译:本文提出了一种新的、有用的原位合成NHC镍烯丙基卤化物配合物[Ni(NHC)(η~3-烯丙基)(X)]的方法,它是从[Ni(CO)_4]、NHC和烯丙基卤化物开始的。[Ni(CO)_4]与(i)一当量的相应NHC和(ii)在室温下与过量的相应烯丙基氯反应,导致一氧化碳消除,形成[Ni(NHC)(η~3-烯丙基)(X)]型络合物。这一方法被用来合成的配合物包括[Ni(Tbuu Tbuu(Tbuu)的合成方法是使用这一方法来合成[Ni(Tb的方法是使用这一方法来合成[Ni(tBu(Tbuu(Tbuu)的方法是使用这一方法来合成[Ni(TBuBuBuu2im)的方法是用于合成[Ni(T7(tBu)tBu(tBu)tBu(tBu)2UUUUU2-U2-U2-U2-U2-U2-U2-U2-U2-U2-U2-U2-U2-U2-U2-U2-U2-U2(TU2-U2(TU2(TU2)Mim)Lim(T8)Im(T留留留留留留留留留留留留留留留留留留留留留留留留留用(Me(Me3)Me~(Me))(η~3-H_2C-C(Me)-CH_2(Cl)](7)。通过核磁共振、红外光谱和元素分析对配合物1至7进行了表征,并给出了配合物2和7的分子结构。烯丙基镍配合物1-7在溶液中是立体化学非刚性的,这是由于(i)NHC围绕镍碳键旋转,(ii)烯丙基围绕Ni-η~3-烯丙基轴旋转和(iii)π-σ-π烯丙基异构化过程。烯丙基卤化物络合物可以甲基化,这可以通过许多络合物[Ni(NHC)(η~3-烯丙基)(X)]与甲基氯化镁或甲基锂的甲基化来证明,这导致络合物[Ni(Me_2Im)(η~3-H_2C-C(Me)-CH_2(Me)](8),[Ni(tBu 2Im)(η~3-H_2C-C(Me)-CH(Me)](9),[Ni(iPr_2Im))(η3-H_-C(Me)-CH)CH(Me)10)的分离来证明,[Ni(iPr_2Im)(η~3-H_2C-C(Me)-CH_2(Me)](11)、[Ni(iPr_2Im)(η~3-H_2C-C(H)-C(Me)2(Me)](12)和[Ni(EtiPrIm~(Me))(η~3-H_2C-C(Me)-CH_2(Me)](13)。对这些配合物进行了充分的表征,包括10和11年的X射线分子结构。

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