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In a round bottom flask equipped with a magnetic stirrer, nitrogen inlet, reflux condenser and drying tube were placed 5-methoxycarbonylbenzoxazolthione (5.2 g, 0.025 mole), phosphorus pentachloride (5.2 g, 0,025 mole), and phosphorus oxychloride (40 mL). The reaction mixture was heated by an oil bath at 95°-100° C. for 4 hours. The reaction mixture was allowed to cool to room temperature and filtered. The filtrate was distilled with a short path distillation apparatus and the product was collected at 160°-163° C. at 29 mm Hg. The product solidified on standing to give a pale yellow solid, m.p. 104°-106° C. Anal Calcd. for C9H6ClNO3: C, 51.1; H, 2.9; N, 6.6; Cl, 16.8. Found: C, 50.7; H, 2.9; N, 6.6; Cl, 16.3

1. customIn a round bottom flask equipped with a magnetic stirrer, nitrogen inlet
2. temperaturereflux condenser
3. customdrying tube
4. temperatureThe reaction mixture was heated by an oil bath at 95°-100° C. for 4 hours
5. filtrationfiltered
6. distillationThe filtrate was distilled with a short path distillation apparatus
7. customthe product was collected at 160°-163° C. at 29 mm Hg
8. customto give a pale yellow solid, m.p. 104°-106° C