A cooled solution of sodium azide (4.10 g, 63.0 mmol) in water (13 mt) at 8°C BusSnCI (17 1 ml) is added dropwise while stirring the solution. After 2h of stirring at 8°C, dichloromethane (38 mi) is added, stirred for another 5 minutes, and phases separated. The water phase is washed with dichloromethane (13 ml). Combined organic phases are washed with 10% NaCI (13 ml) and distilled water (13 ml). The organic phase is dried with sodium sulfate (6.34 g), and the solvent is removed under reduced pressure to give the oily product Tributyltin azide (19.2 g, 91.8%).