Process for the preparation of 4,6-dichloropyrimidines

Details Process for the preparation of 4,6-dichloropyrimidines Process for the preparation of 4,6-dichloropyrimidines

C - Chemistry, Metallurgy

07

D

C07D 239/30 (2006.01)

Patent

CA 2183936

4,6-Dichloropyrimidines are obtained by the reaction of 4,6-dihdroxypyrimidines with excess phosphoryl chloride in a particularly advantageous manner when no base is added, during and/or after the reaction 0.75 to 1.5 mol of phosphorus trichloride and 0.7 to 13 mol of chlorine are added per equivalent of exchanged hydroxyl groups so that an excess of phosphorus trichloride with respect to chlorine is always present, and finally phosphorus trichloride and phosphoryl chloride are separated off. This process can be carried out in a particularly simple manner and also continuously.

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