g, 8.1 mmol) and sodium azide (0.7 g, 11 mmol) were stirred in acetonelwater (95/5, v/v) at room temperature for 12 h. Solvent was removed and the resulting solid filtered, washed with water, and dried. Yield: 1.9 g of 2 (95.7%); mp 140 OC (evolution of nitrogen), 180-181 OC (decomp.)