Nucleophilic Aromatic Substitution at Benzene with Powerful Strontium Hydride and Alkyl Complexes.

Nucleophilic Aromatic Substitution at Benzene with Powerful Strontium Hydride and Alkyl Complexes.
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用强效氢化锶和烷基配合物对苯进行亲核芳香取代

DOI:
10.1002/ange.201901548
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发表时间:
2019
期刊:
影响因子:
--
通讯作者:
S. Harder
S. Harder
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文献类型:
--
作者:
B. Rösch;T. X. Gentner;H. Elsen;C. A. Fischer;J. Langer;M. Wiesinger;S. Harder

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分离第一烷基锶络合物的关键是合成对配体交换反应稳定的氢化锶络合物。该目标通过使用超大体积的β-二酮亚胺配体DIPePBDI(CH[C(Me)N-DIPeP]2,DIPeP= 2,6-二异戊基苯基)来实现。DIPePBDI-H与Sr[N(SiMe 3)2] 2反应得到(DIPePBDI)SrN(SiMe 3)2,其用PhSiH 3转化为[(DIPePBDI)SrH]2。溶解在C6 D 6中,氢化锶络合物在高达70 °C下是稳定的。在60 °C下,H-D同位素交换完全转化为[(DIPePBDI)SrD] 2和C6 D5 H。由于D2与H-D的交换很容易,氢化锶配合物可作为D2氘代C6 H6的催化剂。[(DIPePBDI)SrH] 2与乙烯反应得到[(DIPePBDI)SrEt]2。这种烷基锶络合物的高反应性通过容易的乙烯聚合和C6 D 6的亲核芳族取代来证明,得到烷基化芳族产物和[(DIPePBDI)SrD]2。
Key to the isolation of the first alkyl strontium complex was the synthesis of a strontium hydride complex that is stable towards ligand exchange reactions. This goal was achieved by using the super bulky β‐diketiminate ligandDIPePBDI (CH[C(Me)N‐DIPeP]2, DIPeP=2,6‐diisopentylphenyl). Reaction ofDIPePBDI‐H with Sr[N(SiMe3)2]2gave (DIPePBDI)SrN(SiMe3)2, which was converted with PhSiH3into [(DIPePBDI)SrH]2. Dissolved in C6D6, the strontium hydride complex is stable up to 70 °C. At 60 °C, H–D isotope exchange gave full conversion into [(DIPePBDI)SrD]2and C6D5H. Since H–D exchange with D2is facile, the strontium hydride complex served as a catalyst for the deuteration of C6H6by D2. Reaction of [(DIPePBDI)SrH]2with ethylene gave [(DIPePBDI)SrEt]2. The high reactivity of this alkyl strontium complex is demonstrated by facile ethylene polymerization and nucleophilic aromatic substitution with C6D6, giving alkylated aromatic products and [(DIPePBDI)SrD]2.
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