Sulfuric Acid → 1,3,4,5-Tetrahydro-2H-1-benzazepin-2-one

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Reaction Steps

To a stirred suspension of 13.4 g (207 mmol) of sodium azide and 25.0 ml (188 mmol) of α-tetralone in 150 mL of chloroform, was added 50.0 mL of concentrated sulfuric acid, dropwise over 1 h. After 30 min., the chloroform phase was decanted and the acidic phase poured into 1 L of water. The precipitated solid was collected on a filter, washed with water, and recrystallized from 1 L of boiling water. The product was collected and dried under vacuum to yield 14.3 g (47%) of tan needles. 1H NMR (300 MHz, CDCl3) d 8.63 (1H, bs), 7.24 (2H, m), 7.13 (1H, m), 7.03 (1H, d, J=8 Hz), 2.82 (2H, t, J=6 Hz), 2.38 (2H, t, J=6 Hz), 2.24 (2H, m).

Provenance & Evidence