申请人:DOW CHEMICAL COMPANY LIMITED
公开号:EP0044890A1
公开(公告)日:1982-02-03
A process for preparing a fluoropyridine compound by reacting a chlorinated pyridine compound with a molar excess of an alkali metal fluoride, especially potassium fluoride, in the presence of a catalytic amount of a catalyst selected from halides of organometals and halides of metals of the iron, nickel and copper groups, and which is preferably FeCl3, whereby at least one chlorine atom of the chlorinated pyridine compound is replaced by a fluorine atom. Of special interest is the preparation of 3,5-dichloro-2,4,6-trichloropyridine from pentachloropyridine.
The compounds prepared by such a process are useful for the preparation of agriculturally-useful fluoropyridines.
一种制备氟吡啶化合物的工艺,其方法是在一定催化量的催化剂存在下,使氯化吡啶化合物与摩尔过量的碱金属氟化物,特别是氟化钾反应,该催化剂选自有机金属的卤化物和铁、镍和铜族金属的卤化物,最好是FeCl3,从而使氯化吡啶化合物中至少一个氯原子被氟原子取代。特别有意思的是用五氯吡啶制备 3,5-二氯-2,4,6-三氯吡啶。
通过这种工艺制备的化合物可用于制备农业上有用的氟吡啶。