2-Chloro-5-trichloromethylpyridine of the formula (I):
is produced in high yield by reacting β-picoline of the formula (II):
with chlorine in a gaseous phase at 300 to 500°C, e.g. 330 to 470°C, in a residence time of 0,5 to 60 seconds, in the presence of an inert diluent of nitrogen, a halogenated methane, a halogenated ethane, a halogenated ethylene or a mixture thereof.
2-Chloro-5-trichlormonomethylpyridine is useful as an intermediate for medicines, agricultural chemicals, dyes, especially herbicides.
式(I)的 2-
氯-5-三
氯甲基吡啶:
式(II)的 β-
吡啶与
氯在 300 至 500°C(如 330 至 470°C)的气相中反应,以高产率制得:
在惰性稀释剂氮、卤代
甲烷、卤代
乙烷、卤代
乙烯或它们的混合物存在下,在 300 至 500°C,例如 330 至 470°C,停留时间 0.5 至 60 秒的条件下,在气相中与
氯反应。
2-Cloro-5-trichlormonomethylpyridine 可用作药物、农药、
染料,特别是
除草剂的中间体。