申请人:Bayer Aktiengesellschaft
公开号:US04171442A1
公开(公告)日:1979-10-16
Process for the preparation of 2,4,5-trichloropyrimidine, characterized in that compounds of the formula ##STR1## wherein R a radical which can be split off under the reaction conditions and R' an optionally substituted lower alkyl radical, Are reacted at temperatures from 0.degree. to 50.degree. C. with less than 7.5 mols of chlorine, in particular 3.5 to 7.0 mols of chlorine, and the reaction products are then after-heated to temperatures of 100.degree.-150.degree. C., in particular 110.degree.-140.degree. C., in the absence of chlorine.
制备2,4,5-三氯嘧啶的过程,其特征在于化合物的公式为##STR1##其中R是在反应条件下可以分离的基团,R'是可选取代的较低烷基基团,以0℃至50℃的温度与少于7.5摩尔的氯反应,特别是3.5至7.0摩尔的氯,然后在无氯的情况下将反应产物加热至100℃至150℃,特别是110℃至140℃。