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Formation, Structure and Reactivity of Boryloxycarbyne Complexes of Group 6 Metals

机译:6族金属硼氧碳炔配合物的形成,结构和反应活性

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Reaction of the diborane(4) B_2(NMe_2)_2I_2 with two equivalents of K[(eta~5-C_5L_5)M(CO)_3] (M=Cr, Mo, W) yielded the dinuclear boryloxycarbyne complexes [{eta~5-C_5H_5)(OC)_2M ident to CO}_2-B_2(NMe_2)_2] (4a, M=Mo; b, M=W; c, M=Cr), which were fully characterised in solution by multinuclear NMR methods. The Mo and W complexes 4a, b proved to be kinetically favoured products of this reaction and underwent quantitative rearrangement in solution to afford the complexes [{eta~5-C_5H_5)-(OC)_2M ident to CO}B(NMe_2)B(nmE_2)-{M(CO)_3(eta-C_5H_5)}] (5a, M=Mo; b, M=W); 5a was characterised by X-ray crystalography in the xolid state. Corre-sponding reactions of B_2(NMe_2)_2I_2 with only one equivalent of K[(eta~5-C_5H_5)-M(CO)_3] (M=Mo, W) initially afforded 1:1 mixtures of the boryloxycarbyne complexe 4a,b and unconsumed B_2(NMe_2)_2I_2. This mixute, however, yielded finally the diborane(4)yl complexes [(eta~5-C_5H_5)(OC)_3M{B(NM_e)_2-B(NMe_2)_I}] (6a, M=Mo; b, M=W) by [(eta~5-C_5H_5)(OC)_3M] transfer and rearrangement. Density functional caluculations were carried out for 4c and 5a, b.
机译:乙硼烷(4)B_2(NMe_2)_2I_2与两当量的K [(eta〜5-C_5L_5)M(CO)_3](M = Cr,Mo,W)反应生成双核硼氧碳炔复合物[{eta〜5与CO} _2-B_2(NMe_2)_2]相同的-C_5H_5)(OC)_2M(4a,M = Mo; b,M = W; c,M = Cr)在溶液中通过多核NMR方法充分表征。 Mo和W配合物4a,b被证明是该反应的动力学首选产物,并在溶液中进行了定量重排,从而提供了与CO} B(NMe_2)B([eta〜5-C_5H_5)-(OC)_2M相同的配合物nmE_2)-{M(CO)_3(eta-C_5H_5)}](5a,M = Mo; b,M = W);图5a的特征在于在Xolid状态下的X射线晶体学。 B_2(NMe_2)_2I_2与仅一当量的K [(eta〜5-C_5H_5)-M(CO)_3](M = Mo,W)的相应反应最初提供了1:1的硼氧碳炔化合物4a混合物, b和未食用的B_2(NMe_2)_2I_2。然而,该混合物最终产生了乙硼烷(4)基络合物[(eta〜5-C_5H_5)(OC)_3M {B(NM_e)_2-B(NMe_2)_I}]](6a,M = Mo; b,M =(W)通过[(eta〜5-C_5H_5)(OC)_3M]传输和重新排列。对4c和5a,b进行密度函数计算。

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