Method of synthesizing o-dibromobenzene by diazotization in one step at high temperature
A technology of o-dibromobenzene and diazotization, which is applied in chemical instruments and methods, organic chemistry, preparation of halogenated hydrocarbons, etc., can solve the problems of low product yield, achieve high yield, reduce energy consumption and refrigeration equipment Investment, risk reduction effect
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[0013] Put 500g of hydrobromic acid with a mass fraction of 48%, 10g of cuprous oxide, and 172g of o-bromoaniline into a four-necked flask equipped with a stirrer, condenser, and thermometer, stir and raise the temperature to above 80°C, and drop 72g of A solution of sodium nitrite dissolved in 100g of water, after dripping, change the distillation device with water to distill the product, separate the oil layer, wash once with 100mL of 5% liquid alkali, and then wash once with 100mL water, separate the oil layer , product 194g was evaporated under reduced pressure, content 99.2%, yield 82%. from figure 1 with figure 2 It can be confirmed that the final product obtained in the examples is o-dibromobenzene.
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