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ChemicalBook CAS DataBase List 1,2-DIBROMO-1,1-DIFLUOROETHANE
75-82-1

1,2-DIBROMO-1,1-DIFLUOROETHANE synthesis

5synthesis methods
-

Yield: 97.6%

Reaction Conditions:

with bromine at -5;Temperature;

Steps:

1.2; 2-9; 1-2
Put a 250m1 three-necked flask in an oil bath, A cold trap is installed on the three-necked flask to reflux unreacted raw materials. Add 100g of 20% KOH and 2g of tetramethylammonium chloride to a three-necked flask, Increase the temperature of the oil bath to 80, and add 30g dropwise to the three-necked flask while stirring Raw material CF2Cl-CH2Cl, reaction for 6h, the conversion rate of raw material R132b is 97.6%, The product CF2=CHCl, the selectivity is 97.1%, the reaction product is collected and purified by distillation. Add 100g of liquid bromine into a three-necked flask, the reaction temperature is -5°C, Pass CF2=CHCl into liquid bromine at 100ml/min to 250ml, Until the liquid bromine reaction is complete, the reaction product is washed with deionized water, After distillation, the intermediate product CF2Br-CHClBr was obtained with a yield of 97.6%.

References:

CN112979465, 2021, A Location in patent:Paragraph 0031; 0033; 0037-0038; 0041-0042; 0045-0046; 0049

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