1.1: acetyl chloride; isopentyl nitrite / isopropyl alcohol / 1.5 h / 5 - 40 °C / |Inert atmosphere 2.1: trichlorophosphate / toluene; N,N-dimethyl-formamide / 7 h / 15 - 70 °C / |Inert atmosphere 3.1: potassium fluoride / dimethyl sulfoxide / 4 h / 90 °C 4.1: sodium hydrogencarbonate; water / 4 h / 100 °C 4.2: 1.17 h / 20 °C 5.1: water; sodium hydroxide / toluene / 0.5 h / 20 °C 5.2: 0.5 h / 15 - 25 °C View Scheme