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process for the production of 1.3 - 2.2 - dibrom of propane - 1.3 - dicarbonsaeure derivatives
process for the production of 1.3 - 2.2 - dibrom of propane - 1.3 - dicarbonsaeure derivatives
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机译:生成1.3-2.2-丙烷二溴-1.3-二碳脲衍生物的方法
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摘要
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 andPPR.sup.4 is hydroxy, orPPR.sup.3 and R.sup.4 together are an anhydride oxygen atom,PPwith an acid halide, then reacting the product with bromine at a temperature between 0° and 150° 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.
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