1.1: acetic anhydride / acetic acid / 2 h / Reflux; Large scale reaction 2.1: triethylamine / acetone / 3 h / 20 °C / Large scale reaction 2.2: 1 h / Reflux; Large scale reaction 3.1: sulfuric acid / 6 h / 60 °C / Large scale reaction 4.1: 15 - 30 °C 5.1: 16 h / 30 °C / 3345.86 Torr View Scheme

1.1: acetic anhydride / acetic acid / 2 h / Reflux; Large scale reaction 2.1: triethylamine / acetone / 3 h / 20 °C / Large scale reaction 2.2: 1 h / Reflux; Large scale reaction 3.1: sulfuric acid / 6 h / 60 °C / Large scale reaction 4.1: 15 - 30 °C 5.1: 16 h / 30 °C / 3345.86 Torr 7.1: oxalyl dichloride; dimethyl sulfoxide; triethylamine / dichloromethane / -78 °C View Scheme

1.1: acetic anhydride / acetic acid / 2 h / Reflux; Large scale reaction 2.1: triethylamine / acetone / 3 h / 20 °C / Large scale reaction 2.2: 1 h / Reflux; Large scale reaction 3.1: sulfuric acid / 6 h / 60 °C / Large scale reaction 4.1: 15 - 30 °C 5.1: 16 h / 30 °C / 3345.86 Torr View Scheme

hydrogenchloride in water T=95°C;