Ethyl-Zinc(II)-Cation Equivalents: Synthesis and Hydroamination Catalysis.
Ion-like ethylzinc(II) compounds with weakly coordinating aluminates [Al(OR(F))4](-) and [(R(F)O)3Al-F-Al(OR(F))3](-) (R(F)=C(CF3)3) were synthesized in a one-pot reaction and fully characterized by single-crystal X-ray diffraction, NMR and vibrational spectroscopy, and by quantum chemical calculations. The catalytic activity of ion-like Et-Zn[Al(OR(F))4] in intermolecular hydroamination and in the unusual double hydroamination of anilines and alkynes was investigated. Favorable performance was also found in comparison to the Et2Zn/[PhNMe2H](+)[B(C6F5)4](-) system generated in situ at lower catalyst loadings of 2.5 mol %.
Institut für Anorganische und Analytische Chemie and Freiburger Materialforschungszentrum (FMF), Albert-Ludwigs-Universität Freiburg, Albertstr. 21, 79104 Freiburg (Germany).
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Petersen
Karlsruher Institut für Technologie (KIT), Institut für Anorganische Chemie, Engesserstr. 15, Geb. 30.45, 76131 Karlsruhe (Germany).
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Tausch
Institut für Anorganische und Analytische Chemie and Freiburger Materialforschungszentrum (FMF), Albert-Ludwigs-Universität Freiburg, Albertstr. 21, 79104 Freiburg (Germany).
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Schaefer
Institut für Anorganische und Analytische Chemie and Freiburger Materialforschungszentrum (FMF), Albert-Ludwigs-Universität Freiburg, Albertstr. 21, 79104 Freiburg (Germany).
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Scherer
Karlsruher Institut für Technologie (KIT), Institut für Anorganische Chemie, Engesserstr. 15, Geb. 30.45, 76131 Karlsruhe (Germany). roesky@kit.edu.
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Roesky
Institut für Anorganische und Analytische Chemie and Freiburger Materialforschungszentrum (FMF), Albert-Ludwigs-Universität Freiburg, Albertstr. 21, 79104 Freiburg (Germany). krossing@uni-freiburg.de.
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Krossing
alkynes; aluminum; hydroamination; reactive cations; weakly coordinating anions; zinc