Materials and apparatus: 1-butyl-3-methylimidazolium chloride was supplied by Merck KGaA. Cyclohexanol, cyclobutanol, 1-phenyl-2-propanol, 3-methylcyclohexanol, 4-tertbutylcyclohexanol, TEMPO, TMP*HBr and Oxone ® were supplied by Acros Organics. [bmim]HSO 4 , [bpyr]Br and [empy]Br were obtained from Sigma-Aldrich. [N 4444 ][HSO 5 ] was synthesised according to the literature procedure. 1 The structure and purity of all synthesised substances were confirmed by NMR analysis. 1 H NMR spectra were

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... ecorded at 300 MHz and 13 C NMR at 75 MHz in CDCl 3 (Varian Unity Inova plus, internal TMS). GC analyses were performed using a Perkin Elmer Clarus 500 chromatograph equipped with a SUPELCOWAX TM 10 column (30 m×0.2 mm×0.2 μm) and n-decane as an internal standard. Electrospray ionisation mass spectroscopy (ESI-MS) experiments were performed using a Waters Xevo G2 QTOF with an injection system (cone voltage 50 V; source 120 °C). Thermogravimetric analysis was performed with a Mettler