1.1: dihydrogen peroxide; pyridine / dichloromethane / 20 °C / |Cooling with ice 2.1: copper(l) iodide / tetrahydrofuran / 0.5 h / -78 °C 2.2: 2 h / -78 - -50 °C 3.1: boron trifluoride diethyl etherate / acetic anhydride / 20 °C / |Cooling with ice 4.1: sodium hydride; methanol / mineral oil / 0.5 h / 20 °C 5.1: potassium tert-butylate / tetrahydrofuran / 0.17 h / 0 °C 5.2: 1 h / |Reflux 6.1: potassium hydroxide / propan-1-ol / 1 h / 20 °C / |Reflux 7.1: ethyl acetate; diethyl ether / 0.08 h / 0 °C 8.1: lithium diisopropyl amide / tetrahydrofuran / -78 °C 8.2: 0.5 h / -78 °C 9.1: sodium hydrogencarbonate / para-xylene / 12 h / |Reflux 10.1: lithium aluminium tetrahydride / tetrahydrofuran / 0.5 h / 0 °C 11.1: triethylamine; 4-(N,N-dimethlyamino)pyridine / dichloromethane / 17 h / |Reflux 12.1: sodium tetrahydroborate / N,N-dimethyl-formamide / 12 h / 80 °C / |Cooling with ice 13.1: thiophenol; potassium carbonate / 1-methyl-pyrrolidin-2-one / 13 h / 220 °C View Scheme