申请人:Ciba-Geigy Corporation
公开号:US04469896A1
公开(公告)日:1984-09-04
Chloropyridines of the formula ##STR1## wherein either R is chlorine and R' is methyl or trifluoromethyl, or R is methyl, trichloromethyl or trifluoromethyl and R' is chlorine, or R and R' are methyl, can be obtained by a novel, simple process by the addition of trichloroacetaldehyde to methacrylonitrile or .alpha.-trifluoromethacrylonitrile, 2,2-dichloropropionaldehyde, pentachloropropionaldehyde or 2,2-dichloro-3,3,3-trifluoropropionaldehyde to acrylonitrile, or 2,2-dichloropropionaldehyde to methacrylonitrile, in the presence of a catalyst, in particular copper powder or copper(I) chloride, and cyclizing the open-chain intermediate obtained. The chloropyridines of the formula (I) are known per se and are suitable for the production of different compounds, in particular of insecticides and herbicides.
公式为##STR1##的
氯吡啶,其中R为
氯且R'为甲基或三
氟甲基,或R为甲基、三
氯甲基或三
氟甲基且R'为
氯,或R和R'为甲基,可通过一种新颖简单的方法获得,即将
三氯乙醛加入
甲基丙烯腈或α-三
氟甲基丙烯腈、
2,2-二氯丙醛、五
氯丙醛或2,2-二
氯-
3,3,3-三氟丙醛加入
丙烯腈,或将
2,2-二氯丙醛加入
甲基丙烯腈,在催化剂的存在下,特别是在
铜粉或
氯化
铜(I)的存在下,并使得得到的开链中间体环化。公式(I)的
氯吡啶本身是已知的,并适用于生产不同化合物,特别是
杀虫剂和
除草剂的生产。