申请人:IMPERIAL CHEMICAL INDUSTRIES PLC
公开号:EP0022606A1
公开(公告)日:1981-01-21
2,2-Dichloro-5-methyl-1,1,1-trifluorohex-4-ene, an intermediate in the synthesis of pyrethroid insecticides, is obtained by continuous distillation, preferably under sub- atmospheric pressure, of a mixture of 5-methyl-2,2,4-tri- chtoro-1,1,1 -triftuorohexane, dimethylformamide and lithium bromide, precipitating the chlorofluorocarbons from the distillate with water and separating the desired product from starting material by a further distillation.
2,2-二氯-5-甲基-1,1,1-三氟己-4-烯是合成拟除虫菊酯类杀虫剂的中间体,它是通过连续蒸馏(最好是在次大气压下)5-甲基-2,2,4-三氟-1,1,1-三氟己烷、二甲基甲酰胺和溴化锂的混合物而获得、4-三氟-1,1,1-三氟己烷、二甲基甲酰胺和溴化锂的混合物,用水沉淀馏出物中的氯氟化碳,并通过进一步蒸馏从起始原料中分离出所需产物。