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A solution of 6-nitro-benzoic acid in benzene was treated with thionyl chloride (2.5 eq) and stirred at reflux for 8 h. After evaporation, the residue was dissolved in chloroform and then treated with methanol. After stirring at reflux for 3 h, the mixture was evaporated to afford compound 3.

1. temperatureat reflux for 8 h
2. customAfter evaporation
3. dissolutionthe residue was dissolved in chloroform
4. additiontreated with methanol
5. stirringAfter stirring
6. temperatureat reflux for 3 h
7. customthe mixture was evaporated