Dimethylformamide → 5-Chloro-2,3-dimethoxybenzaldehyde

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A mixture of 5-Chloro-2-hydroxy-3-methoxybenzaldehyde (275 g, 1.47 mol) and DMF were stirred as potassium carbonate (411 g, 2.97 mol) was added over 5 minutes. The mixture temperature rose from 22 to 29° C. over 10 minutes. Dimethylsulfate (283 g, 2.24 mol) was added over 15 minutes causing a temperature rise from 28 to 47° C. The mixture was then heated with a heating mantle to 61° C. over 15 minutes and stirred at 61° C. for 1.5 hours; the reaction was complete by TLC. The reaction mixture was cooled to 22° C., transferred to a 22-L flask and diluted with water (8.2 L) over 5 minutes; the temperature rose to 38° C. The light yellow mixture was filtered and the flask and filter cake rinsed with 1.5 L water. The solid was dried under vacuum for 15 hour at 50° C. The material contained inorganic salts and was suspended in water (3 L) for 1.5 hours. After filtration and a 500 mL water rinse, the filter cake was dried under by suction and overnight at 65° C. under vacuum. Yield: 305 g (100% yield, 99.1% purity).

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