[Cl:1][C:2]1[CH:10]=[CH:9][C:5]([C:6](O)=[O:7])=[CH:4][N:3]=1.O=S(Cl)[Cl:13]>>[ClH:1].[Cl:1][C:2]1[CH:10]=[CH:9][C:5]([C:6]([Cl:13])=[O:7])=[CH:4][N:3]=1A solution of 6-chloronicotinic acid (10.00 g, 63.5 mmol) in SOCl2 (37 mL) was heated to reflux for 2 h. The SOCl2 was evaporated to dryness, to afford 12.56 g of the desired product (yield: 93%).
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