METHOD OF PREPARATION OF 3,5-DICHLORO-2,4,6- TRIFLUOROPYRIDINE

摘要

The preparation of 3,5-dichloro-2,4,6-trifluoropyridine from pentachloropyridine and potassium fluoride was found to proceed in high yield and at a rapid rate with little tar formation when the reaction is conducted under essentially anhydrous conditions in N-methylpyrrolidone solvent at temperatures below 170.degree.C. High yields of this intermediate used in making herbicides are obtained. 35,525-F