1: 87 percent / 2,4,6-triisopropylbenzenesulfonyl chloride; 3-nitro-1,2,4-1H-triazole; pyridine / 1 h / 20 °C 2: Me3SiCl / acetonitrile / 6 h / 60 °C 3: 0.060 g / aq. NH3 / acetonitrile / 0.08 h / 20 °C 4: CD3CO2D; D2O / 23 °C View Scheme