1: 98 percent / aq. NaOH / methanol / 24 h / Ambient temperature 2: 99.8 percent / N,N'-dicyclohexylcarbodiimide, 4-(dimethylamino)pyridine / tetrahydrofuran / 22 h / Ambient temperature 3: 85 percent / aq. CF3COOH / tetrahydrofuran / 1 h / Ambient temperature 4: 23 percent / mercuric trifluoroacetate / acetonitrile / 0.6 h / Ambient temperature; other reagents, solvents and time View Scheme

acetyl chloride in methanol T=20°C; 0.05 h;

sodium hydroxide in methanol 24 h; Ambient temperature;