New strategies for the synthesis of lactones using peroxymonosulphate salts, ionic liquids and microwave or ultrasound irradiation

Karolina Matuszek, Przemysław Zawadzki, Wojciech Czardybon, Anna Chrobok
2014 New Journal of Chemistry  
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
more » ... 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
doi:10.1039/c3nj01170d fatcat:t7ydawgz2rgmnoyidp2bhhv2wm