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Carbonylchromium Derivatives of Bismuth: New Syntheses and Relevance to C-O Activation

机译:铋的羰基铬衍生物:新的合成及其与C-O活化的关系

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We have discovered a series of novel pentacarbonylchromium derivatives of bismuth from the reactions of NaBiO_3 with [Cr(CO)_6] in KOH/MeOH solutions. When the reaction was carried out at room temperature, the highly charged [Bi{Cr(CO)_5}+4]~(3-) (1) was obtained, whose structure was shown by X-ray analysis to possess a central bis-much atom tetrahedrally coordination to four [Cr(CO)_5] groups. As the reaction was heated at 80 deg C, the methyl-substituted complex [MeBi{Cr(CO)_5}_3]~(2-) (2) was obtained, presumably via the C-O activation of MeOH. Further reactions of 1 with CH_2Cl_2 or CH ident to CCH_2Br form the halo-substituted complexes [XBi{Cr(CO)_5}_3]~(2-) (X = Cl, 3; Br, 4), respectively. On the other hand, the reactions of 1 with RI (R = Me, Et) led to the formation of the alkyl-substituted compexes [RBi{Cr(CO)_5}_3]~(2-) (R = Me, 2; Et). The formation of complexes 1-4 is discussed, presumably via the intermediate bismuthinidene [Bi{Cr(CO)_5}_3]~- or the trianion [Bi{Cr(CO)_5}_3]~(3-).
机译:我们已经从NaBiO_3与[Cr(CO)_6]在KOH / MeOH溶液中的反应中发现了一系列新颖的铋的五羰基铬衍生物。在室温下进行反应时,获得高电荷的[Bi {Cr(CO)_5} +4]〜(3-)(1),通过X射线分析显示其结构具有中心双键。 -多原子四面体配位到四个[Cr(CO)_5]基团。当将反应物在80℃加热时,大概通过MeOH的C-O活化获得了甲基取代的配合物[MeBi {Cr(CO)_5} _3]〜(2-)(2)。 1与CH_2Cl_2或CH等同于CCH_2Br的进一步反应分别形成卤素取代的配合物[XBi {Cr(CO)_5} _3]〜(2-)(X = Cl,3; Br,4)。另一方面,1与RI的反应(R = Me,Et)导致形成烷基取代的化合物[RBi {Cr(CO)_5} _3]〜(2-)(R = Me,2 ;等)。讨论了配合物1-4的形成,大概是通过中间体双变亚叉基[Bi {Cr(CO)_5} _3]〜或三阴离子[Bi {Cr(CO)_5} _3]〜(3-)。

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