Nucleophilic Aromatic Substitution at Benzene with Powerful Strontium Hydride and Alkyl Complexes |
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| Authors: | Bastian Rsch Thomas Xaver Gentner Holger Elsen Christian A Fischer Jens Langer Michael Wiesinger Sjoerd Harder |
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| Institution: | Bastian Rösch,Thomas Xaver Gentner,Holger Elsen,Christian A. Fischer,Jens Langer,Michael Wiesinger,Sjoerd Harder |
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| Abstract: | 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 ligand DIPePBDI (CHC(Me)N‐DIPeP]2, DIPeP=2,6‐diisopentylphenyl). Reaction of DIPePBDI‐H with SrN(SiMe3)2]2 gave (DIPePBDI)SrN(SiMe3)2, which was converted with PhSiH3 into (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]2 and C6D5H. Since H–D exchange with D2 is facile, the strontium hydride complex served as a catalyst for the deuteration of C6H6 by D2. Reaction of (DIPePBDI)SrH]2 with 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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| Keywords: | DFT-Rechnungen Erdalkalimetalle Strontium Strukturaufklä rung Substitutionen |
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