| 摘要 |
An improved process for selectively chlorinating 4,5-dihydro-1-phenyl-1H-1,2,4-triazole-5-ones, including 4,5-dihydro-3-alkyl-1-phenyl-1H-1,2,4-triazole-5-ones and4-haloalkyl-4, 5-dihydro-3-alkyl-1-phenyl-1H-1,2,4-triazole-5-ones in the 4-position of the phenyl ring by dissolving the compounds in a synergistic ratio of polar aprotic solvents, preferably acetonitrile and N,N-dimethylformamide in a 7:3 ratio and reacting the solution with chlorine gas. |
