[OH:1][C:2]1[CH:3]=[CH:4][C:5]([N+:10]([O-:12])=[O:11])=[C:6]([CH:9]=1)[CH2:7][OH:8].C(=O)([O-])[O-].[K+].[K+].[CH2:19](Br)[CH2:20][CH2:21][CH3:22]>CN(C)C(=O)C>[CH2:19]([O:1][C:2]1[CH:3]=[CH:4][C:5]([N+:10]([O-:12])=[O:11])=[C:6]([CH:9]=1)[CH2:7][OH:8])[CH2:20][CH2:21][CH3:22]5.1 g (30 mmol) of 5-hydroxy-2-nitrobenzyl alcohol were stirred with 2.5 g (18 mmol) of potassium carbonate and 25 ml of N,N-dimethylacetamide at 70°-80° C. for 30 minutes. After cooling to 20° C., 3.9 ml (36 mmol) of 1-butylbromide were added dropwise and the mixture was stirred at 90° C. for 2 hours. After cooling, the reaction mixture was concentrated in vacuo, the residue was treated with water and the pH was brought to 7 with 2N HCl. The oil obtained crystallizes after about 30 minutes; the product was filtered off with suction, washed with water and dried; 6 g, melting point 47°-49° C.
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