1.1: ozone / methanol / 6 h / -40 - -30 °C / |Inert atmosphere; |Large scale 2.1: sodium hydroxide / ethanol; water / 8 - 9 °C / |Inert atmosphere 2.2: 1 h / 5 - 7 °C 2.3: 8.75 h / 1 - 9 °C View Scheme