Quaternary 4-Amino-1,2,4-triazolium Salts: Crystal Structures of Ionic Liquids and N-Heterocyclic Carbene (NHC) Complexes
2009; De Gruyter; Volume: 64; Issue: 6 Linguagem: Inglês
10.1515/znb-2009-0604
ISSN1865-7117
AutoresA. Schwarzler, Gerhard Laus, Volker Kahlenberg, Klaus Wurst, Thomas Gelbrich, Christoph Kreutz, Holger Kopacka, Günther K. Bonn, Herwig Schottenberger,
Tópico(s)Asymmetric Hydrogenation and Catalysis
ResumoQuaternary salts were prepared by reaction of 4-amino-1,2,4-triazole and 4-amino-3,5-dialkyl- 1,2,4-triazoles (alkyl = Me, Et) with dimethyl and diethyl sulfate at ambient temperature. Subsequent ion metathesis gave hexafluorophosphates and bis(trifluoromethylsulfonyl)imides as crystalline derivatives or ionic liquids.Methylation at 100 ◦ C gave the 4-(dimethylamino)-1-methyl-1,2,4- triazolium salt, a precursor for a new carbene ligand which was incorporated into Ag and Rh complexes. The synthesis of 5-bromo-4-(dimethylamino)-1-methyl-1,2,4-triazolium hexafluorophosphate is also reported. Crystal structures of fourteen compounds have been determined by X-ray diffraction
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