ChemicalBook CAS DataBase List 2-CHLORO-1,1-DIFLUOROETHYLENE

2-CHLORO-1,1-DIFLUOROETHYLENE synthesis

10synthesis methods

Product Name:2-CHLORO-1,1-DIFLUOROETHYLENE
CAS Number:359-10-4
Molecular formula:C2HClF2
Molecular Weight:98.48

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Yield: 97.1%

Reaction Conditions:

with tetramethlyammonium chloride;potassium hydroxide at 80; for 6 h;Temperature;Reagent/catalyst;

Steps:

1.1; 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 0031-0032; 0037-0038; 0041-0042; 0045-0046; 0049