反应详情

12.4 g (0.10 mol) of 4-hydroxy-6-ethylpyrimidine, prepared according to EP 326 389, are introduced into 25 ml of phosphorus oxychloride, the temperature rising spontaneously to 70° C. A clear solution is formed, which is kept at 70° C. for a further 2 hours and, after cooling, is stirred into ice-water. Extraction with ether yields 12.0 g of liquid crude product which is distilled in a bulb tube at 105° C. under a pressure of 26 mbar to give 11.0 g of pure substance. Analysis: C6H7ClN2 (M=142.59).

1. customrising spontaneously to 70° C
2. customA clear solution is formed
3. temperatureafter cooling
4. extractionExtraction with ether