1.1: ozone / dichloromethane / -70 °C / Inert atmosphere 1.2: -70 - 20 °C 2.1: 2-methyl-but-2-ene; sodium chlorite; sodium dihydrogenphosphate / water; tert-butyl alcohol; tetrahydrofuran / 4 h / 20 °C 3.1: methylamine / water; tetrahydrofuran / 5 - 23 °C View Scheme