申请人:Bayer Aktiengesellschaft
公开号:US04321408A1
公开(公告)日:1982-03-23
In the preparation of a 1,3-dibromo-2,2-dimethyl-propane-1,3-dicarboxylic acid derivative of the formula ##STR1## in which R.sup.1 and R.sup.2 each independently is chlorine or alkoxy, by reacting a 2,2-dimethyl-propane-1,3-dicarboxylic acid derivative of the formula ##STR2## in which R.sup.3 is hydroxy or alkoxy and R.sup.4 is hydroxy, or R.sup.3 and R.sup.4 together are an anhydride oxygen atom, with an acid halide, then reacting the product with bromine at a temperature between 0.degree. and 150.degree. C. to form a 1,3-dibromo-2,2-dimethyl-propane-1,3-dicarboxylic acid chloride and optionally reacting such acid chloride with an alkanol, the improvement which comprises employing an acid chloride as the acid halide, e.g. phosphorus pentachloride, phosphorus oxychloride, phosphorus trichloride, thionyl chloride or phosgene. Compounds of the formula ##STR3## are new. The products are intermediates for making insecticides.
通过反应式为##STR1##的1,3-二
溴-
2,2-二甲基丙烷-1,3-二
羧酸衍
生物的制备,其中R.sup.1和R.sup.2各自独立地为
氯或烷氧基,通过将反应式为##STR2##的
2,2-二甲基丙烷-1,3-二
羧酸衍
生物与酸卤反应,其中R.sup.3为羟基或烷氧基,R.sup.4为羟基,或R.sup.3和R.sup.4一起为酸酐氧原子,然后将产物与
溴在0℃至150℃的温度下反应,形成1,3-二
溴-
2,2-二甲基丙烷-1,3-二
羧酸氯化物,并可选择性地将此类酸
氯化物与烷基醇反应,改进的方法包括使用酸
氯化物作为酸卤,例如
五氯化磷、
氯氧化
磷、
三氯化磷、
氯化硫酰或
光气。式##STR3##的化合物是新的。该产品是制造
杀虫剂的中间体。