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In greater detail, coumarin (10 g, 68 mmol) was nitrated as described in the literature with an excess of fuming nitric acid overnight at room temperature to give 6-nitrocoumarin as the only major product. The 6-nitrocoumarin exhibited the following characteristics: Yield 85%. 1H NMR (DMSO-d6): 8.74 (d, J=3 Hz, 1H), 8.42 (dd, J=3, 9 Hz, 1H), 8.24 (d, J=10 Hz, 1H), 7.63 (d, J=9 Hz, 1H), 6.70 (d, J=10 Hz, 1H).

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