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Was prepared by stirring a mixture of 5-(4-nitrophenyl)-2-furoic acid (1.0 g, 4.3 mmol) and thionyl chloride (10 ml) at reflux for 2 hours. The mixture was evaporated and co-evaporated with anhydrous toluene. The acid chloride was used without further purification.

1. customWas prepared
2. temperatureat reflux for 2 hours
3. customThe mixture was evaporated
4. customThe acid chloride was used without further purification