Dichloromethane → 1-Methoxy-1,3,3-trimethylurea

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A mixture of dimethylhydroxylamine hydrochloride (150.0 g, 1.54 mol), 4-dimethylaminopyridine (9.4 g, 0.076 mol), and dichloromethane (1.35 L) was chilled to −20° C., under argon. Dimethylcarbamyl chloride (135 ml, 1.46 mol) and pyridine (315 ml) were added consecutively over 25 minutes. The reaction was slowly warmed to room temperature over 2 hours, and agitated for about 16 hours. The reaction mixture was filtered to remove pyridine hydrochloride, and concentrated by rotary evaporator. The mixture was diluted with t-butyl methyl ether (500 ml), and the solids were removed by filtration. The filtrate was concentrated by rotary evaporation. Vacuum distillation provided the desired product (135.10 g, 69%) as a colorless oil.

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