Abstract
AbstractThe dioxovanadium(V) complexes [VO2(3,5‐Me2Hpz)3][BF4] (1) (pz=pyrazolyl), [VO2{SO3C(pz)3}] (2), [VO2{HB(3,5‐Me2pz)3}] (3) and [VO2{HC(pz)3}][BF4] (4), bearing pyrazole or scorpionate ligands, were obtained by reaction of triethyl vanadate [VO(OEt)3] with hydrotris(3,5‐dimethyl‐1‐pyrazolyl)methane [HC(3,5‐Me2pz)3] or 3,5‐dimethylpyrazole (3,5‐Me2Hpz; 1), lithium tris(1‐pyrazolyl)methanesulfonate {Li[SO3C(pz)3], 2}, potassium hydrotris(3,5‐dimethyl‐1‐pyrazolyl)borate {K[HB(3,5‐Me2pz)3], 3} and hydrotris(1‐pyrazolyl)methane [HC(pz)3, 4], respectively. Treatment of [VO(OEt)3] with potassium hydrotris(1‐pyrazolyl)borate {K[HB(pz)3]} led to the mixed η3‐tris(pyrazolyl)borate and η2‐bis(pyrazolyl)borate oxovanadium(IV) complex [VO{HB(pz)3}{H2B(pz)2}, 5]. The compounds were characterized by elemental analyses, IR, NMR and EPR spectroscopy, FAB and ESI mass spectrometry, cyclic voltammetry and, for 5, also by single crystal X‐ray diffraction analysis. All complexes exhibit catalytic activity in the single‐pot carboxylation [in trifluoroacetic acid/potassium peroxodisulfate (CF3COOH/K2S2O8)] of gaseous alkanes (methane and ethane) to carboxylic acids (yields up to 40%, TONs up to 157) and in the peroxidative oxidation [in water/acetonitrile (H2O/NCMe)] of liquid alkanes (cyclohexane and cyclopentane) to the corresponding alcohols and ketones (yields up to 24%, TONs up to 117), under mild conditions.
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