1.1: tetrahydrofuran / 4 h / 20 - 45 °C / |Large scale 2.1: sodium hydroxide; dihydrogen peroxide / 1 h / 25 °C / |Large scale 3.1: sodium hydride; 15-crown-5 / tetrahydrofuran; mineral oil / 6 h / 0 °C / |Large scale 4.1: cerium(III) chloride / tetrahydrofuran / 0.5 h / -15 °C 4.2: 0.5 h / -15 °C 5.1: cerium(III) chloride / tetrahydrofuran / 0.5 h / -15 °C / |Large scale 5.2: 0.5 h / -15 °C / |Large scale 6.1: N-bromosuccinmide; 2,2'-azo-bisisobutyronitrile / n-heptane / 0.25 h / 78 °C 7.1: 2,4,6-trimethyl-pyridine / toluene / 2.5 h / 110 °C / |Large scale 8.1: tetrabutyl ammonium fluoride / tetrahydrofuran / 9 h / 66 °C 9.1: tetrahydrofuran / 7 h / 10 °C / |Irradiation 10.1: tetrahydrofuran / 85 h / 25 °C View Scheme