Novel transition-metal (M=Cr, Mo, W, Fe) carbonyl complexes with bis(guanidinato)silicon(II) ligands.
Novel transition-metal (M=Cr, Mo, W, Fe) carbonyl complexes with bis(guanidinato)silicon(II) ligands.
复制标题
新型过渡金属（M=Cr、Mo、W、Fe）羰基配合物与双（胍基）硅（II）配体。
作者：
Felix M. Mück;Dorit Kloß;Johannes A. Baus;C. Burschka;R. Tacke
供体稳定化的亚甲硅烷基2（第一双（胍基）硅（II）络合物）与过渡金属羰基络合物[M（CO）6 ]（M=Cr、Mo、W）反应以形成相应的亚甲硅烷基络合物7-10。在与[M（CO）6 ]（M=Cr，Mo，W）的反应中，双胍基硅（II）配合物2的行为与类似的双脒基硅（II）配合物1完全不同，后者与[M（CO）6 ]作为亲核试剂反应，仅取代六个羰基中的一个。与此相反，2的反应导致新的螺环化合物7-9，其含有四元SiN 2 C环和五元MSiN 2 C环，具有M Si和M N键（两个羰基的亲核取代）。化合物7-10通过元素分析（C、H、N）、晶体结构分析和固态和溶液中的NMR光谱研究来表征。
The donor-stabilized silylene 2 (the first bis(guanidinato)silicon(II) complex) reacts with the transition-metal carbonyl complexes [M(CO)6 ] (M=Cr, Mo, W) to form the respective silylene complexes 7-10. In the reactions with [M(CO)6 ] (M=Cr, Mo, W), the bis(guanidinato)silicon(II) complex 2 behaves totally different compared with the analogous bis(amidinato)silicon(II) complex 1, which reacts with [M(CO)6 ] as a nucleophile to replace only one of the six carbonyl groups. In contrast, the reaction of 2 leads to the novel spirocyclic compounds 7-9 that contain a four-membered SiN2 C ring and a five-membered MSiN2 C ring with a MSi and MN bond (nucleophilic substitution of two carbonyl groups). Compounds 7-10 were characterized by elemental analyses (C, H, N), crystal structure analyses, and NMR spectroscopic studies in the solid state and in solution.