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A mixture of 2.9 g of 3-(2-chlorophenyl)-1,2,4-thiadiazole-5-sulfonamide in 11 ml of trimethyl orthoisobutyrate was warmed to about 85° with an oil bath. After 2.5 hours the solution was cooled to room temperature, whereupon a precipitate formed. Hexane (25 ml) was added to insure complete precipitation. The solid was filtered, washed with hexane and vacuum dried (P2O5) to give 3.08 g of solid, m.p. 75°-76°.

1. temperaturewas warmed to about 85° with an oil bath
2. customformed
3. customprecipitation
4. filtrationThe solid was filtered
5. washwashed with hexane and vacuum
6. dry with materialdried (P2O5)