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

1,2-DICHLORO-1,2-DIFLUOROETHYLENE synthesis

11synthesis methods

Product Name:1,2-DICHLORO-1,2-DIFLUOROETHYLENE
CAS Number:598-88-9
Molecular formula:C2Cl2F2
Molecular Weight:132.92

76-12-0
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Yield: 92%

Reaction Conditions:

zinc in isopropyl alcohol at 75 - 80; for 1 h;Product distribution / selectivity;

Steps:

6
60.0 g of zinc in powder, activated by washing with a HCl solution 3N, 500 ml of isopropanol, are introduced in inert nitrogen atmosphere in a 1 litre three-necked reactor, equipped with magnetic stirrer, dropping funnel, thermometer, connected by a vigreaux column and a water condenser to a cold trap maintained at the temperature of -75°C. The inner temperature is brought to 75°C. Then 114 g of FCCl₂CCl₂F obtained as described in the Example 5 and then purified by fractional distilllation up to a purity of 99%, are dropwise added. When the addition is over, the mixture is left under stirring for one hour at 80°C. 67.9 g of CFC 1112 are collected in the cold trap. The yield in CFC 1112 is equal to 92%.

References:

Solvay Solexis S.p.A. EP1801090, 2007, A2 Location in patent:Page/Page column 10