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2-Amino-5-bromothiazole (19.0 grams) and a saturated solution of phosgene in ethyl acetate (200 ml) were charged into a glass reaction vessel equipped with a mechanical stirrer, thermometer and reflux condenser. The reaction mixture was heated at reflux with stirring for a period of about 3 hours. After this time the reaction mixture was cooled and filtered to recover the desired product 5-bromothiazol-2-yl isocyanate dimer as a fine yellow powder.

1. customequipped with a mechanical stirrer
2. temperaturethermometer and reflux condenser
3. temperatureThe reaction mixture was heated
4. temperatureat reflux
5. temperatureAfter this time the reaction mixture was cooled
6. filtrationfiltered
7. customto recover the desired product 5-bromothiazol-2-yl isocyanate dimer as a fine yellow powder