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A mixture of aluminium chloride 6.53 g, sodium azide 9.55 g and tetrahydrofuran 100 mL was stirred with heating under reflux for two hours. The reaction mixtures were cooled under ice-cooling and thereto were added 3-trifluoromethyl-2-methylbenzoic acid chloride and tetrahydrofuran 100 mL and the mixtures were stirred with heating under reflux for ten hours. After cooling the mixtures, to a mixture of sodium nitrite 14.7 g and water 200 mL was added the reaction mixtures with stirring. The mixtures were acidified with concentrated hydrochloric acid and were then extracted with ethyl acetate. The organic layers were dried over anhydrous sodium sulfate and the resulting mixtures were then concentrated under reduced pressure to give 1-(2-methyl-3-trifluoromethylphenyl)-1,4-dihydrotetrazole-5-one.

1. temperaturewith heating
2. temperatureunder reflux for two hours
3. customThe reaction mixtures
4. temperaturewere cooled under ice-
5. temperaturecooling
6. stirringthe mixtures were stirred
7. temperaturewith heating
8. temperatureunder reflux for ten hours
9. temperatureAfter cooling the mixtures
10. additionwas added
11. customthe reaction mixtures
12. stirringwith stirring
13. extractionwere then extracted with ethyl acetate
14. dry with materialThe organic layers were dried over anhydrous sodium sulfate
15. concentrationthe resulting mixtures were then concentrated under reduced pressure