Chlorine → 2,6-Dichlorobenzoxazole

Participants

Reaction Steps

223.5 g (1 mole) of potassium 6-chloro-2-mercaptobenzoxazole are suspended in 500 ml of chlorobenzene and 180 g (2.5 moles) of chlorine gas are added in the course of 3 hours at a temperature of approx. 25° C. Stirring is continued for 12 hours at room temperature and excess chlorine is blown out of the mixture by means of nitrogen. The precipitated potassium chloride is filtered off and rinsed with approx. 200 ml of chlorobenzene. The filtrate is then distilled. When the sulfur dichloride and chlorobenzene have been distilled off, 171 g (91% of theory) of 2,6-dichlorobenzoxazole are obtained, having a melting point of 49°-51° C. and a boiling point of 124°-128.5° C. under approx. 25 mbars.

Provenance & Evidence