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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Direct hydrosilylation by a zirconacycle with β-hydrogen
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Direct hydrosilylation by a zirconacycle with β-hydrogen

机译:锆碳环与β-氢的直接氢化硅烷化

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Azasilazirconacycle Cp_2Zr{κ~2-N(SiHMe_2)SiHMeCH_2} (1) and formaldehyde react through an uncatalyzed addition reaction (hydrosilylation) to form an exocyclic methoxysilyl-substituted zirconacycle. Although 1 contains 2-center-2-electron SiH groups, this transformation parallels the reactions of non-classical [Cp_2ZrN(SiHMe_2)_2]~+ ([2]~+) with carbonyls. Reactions of 1 with a series of nucleophilic and electrophilic agents were explored, as well as reactions of related β-SiH-containing silazidozirconium compounds, to develop a rationale for the unexpected hydrosilylation. For example, carbon monoxide and 1 react at the Zr-C bond to form Cp_2Zr{κ~2-OC(vCH_2)SiHMeN(SiHMe_2)} (7). The Lewis acid B(C_6F_5)_3 also reacts at the Zr-C bond to give Cp_2Zr{N(SiHMe_2)SiHMeCH_2B(C_6F_5)_3} (8). OPEt3 and N,N-dimethylaminopyridine (DMAP) do not appear to interact with 1. In contrast, OPEt3 and DMAP react with non-classical compounds [2]~+ and zwitterionic 8.
机译:氮杂硅氮杂碳环Cp_2Zr {κ〜2-N(SiHMe_2)SiHMeCH_2}(1)与甲醛通过未催化的加成反应(氢硅烷化)反应形成环外的甲氧基甲硅烷基取代的氧化锆环。尽管1包含2个中心2电子的SiH基团,但这种转化与非经典[Cp_2ZrN(SiHMe_2)_2]〜+([2]〜+)与羰基的反应平行。探索了1与一系列亲核试剂和亲电子试剂的反应,以及相关的含β-SiH的硅氮杂锆化合物的反应,从而为意外的氢化硅烷化开发了原理。例如,一氧化碳和1在Zr-C键上反应形成Cp_2Zr {κ〜2-OC(vCH_2)SiHMeN(SiHMe_2)}(7)。路易斯酸B(C_6F_5)_3也在Zr-C键上反应生成Cp_2Zr {N(SiHMe_2)SiHMeCH_2B(C_6F_5)_3}(8)。 OPEt3和N,N-二甲基氨基吡啶(DMAP)似乎不与1相互作用。相反,OPEt3和DMAP与非经典化合物[2]〜+和两性离子8反应。

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