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Theoretical insights into C–C bond formation through isonitrile insertion into a Cp*Ti complex

机译:通过将异腈插入Cp * Ti络合物中形成C–C键的理论见解

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The migratory insertion of isonitriles into the metal–C bond is important for constructing C–C bonds in organic and pharmaceutical syntheses. We examine the reaction of Cp*(Cl)Ti(diene) with isonitriles using density functional theory calculations. At room temperature, the bis-insertion reaction occurs easily for N-tert-butyl (tBu), methyl (Me), ethyl (Et), 2,6-dimethylphenyl (Ar), and N-1-adamantyl (1-Ad)-substituted isonitriles. The elementary reactions include the isomerisation of Cp*(Cl)Ti(diene), migratory insertion of the first isonitrile into a Ti–C bond, C–C reductive elimination, β-H elimination, migratory insertion of the second isonitrile into a Ti–H bond, and C–C reductive coupling. Two reliable fragmentation mechanisms are suggested for the bis-insertion products. For the bulkier tBuNC, ArNC, and 1-AdNC, the β-H elimination reaction pathway is dominant. For the smaller MeNC and EtNC, the γ-H elimination reaction pathway competes with the β-H elimination. For ArNC, the isomerisation reaction pathway to a newly predicted “σ complex” is kinetically favourable.
机译:异腈向金属-C键的迁移插入对于在有机和药物合成中构建CC键很重要。我们使用密度泛函理论计算研究了Cp *(Cl)Ti(diene)与异腈的反应。在室温下, N-叔-丁基( t Bu),甲基(Me),乙基(Et),2,6-容易发生双插入反应二甲基苯基(Ar)和 N -1-金刚烷基(1-Ad)取代的异腈。基本反应包括Cp *(Cl)Ti(二烯)的异构化,第一个异腈迁移插入Ti-C键,CC还原消除,β-H消除,第二个异氰酸迁移迁移到Ti -H键和CC还原耦合。对于双插入产品,提出了两种可靠的碎裂机制。对于体积较大的 t BuNC,ArNC和1-AdNC,β-H消除反应途径占主导地位。对于较小的MeNC和EtNC,γ-H消除反应途径与β-H消除竞争。对于ArNC,从动力学上讲,异构化反应途径是新预测的“σ配合物”。

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