[C:1]([O:9][C:10]1[CH:15]=[CH:14][C:13]([OH:16])=[CH:12][CH:11]=1)(=[O:8])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[N+:17]([O-])([OH:19])=[O:18]>C(O)(=O)C>[C:1]([O:9][C:10]1[CH:11]=[CH:12][C:13]([OH:16])=[C:14]([N+:17]([O-:19])=[O:18])[CH:15]=1)(=[O:8])[C:2]1[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=1To a stirred solution of 4-hydroxyphenyl benzoate (10 g, 47 mmol) in acetic acid (250 mL) was added, dropwise with external ice-bath cooling, nitric acid (d=1.42, 2.9 mL) (T=10° C.). The mixture was warmed to 20° C. and stirred for a further 56 h. The solution was evaporated in vacuo and water added to the residue. The resulting yellow solid was collected by filtration, washed with water and dried in vacuo to give the title compound (11.8 g, 97%).
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