申请人:The Dow Chemical Company
公开号:US03976644A1
公开(公告)日:1976-08-24
A method for preparing 2,5-dihalopyrazines corresponding to the formula ##SPC1## Wherein X represents chloro, bromo or fluoro which comprises, reacting a 3,5,6-trihalo-2-hydrazinopyrazine of the formula ##SPC2## With an aqueous alkali metal hydroxide in the presence of a hydroxylic reaction medium.
制备2,5-二卤吡嗪的方法对应于公式##SPC1##,其中X代表氯、溴或氟,包括在含有羟基反应介质的情况下,将公式##SPC2##的3,5,6-三卤-2-肼基吡嗪与水溶性碱金属氢氧化物反应。