2-(1,2-dichloro-1,2,2-trifluoroethoxy)-1,1,1,2,3,3,3-heptafluoropropane synthesis

Yield:-

Reaction Conditions:

with fluorine at -80; for 4 h;

Steps:

8 EXAMPLE 8; Synthesis of (CF3)2-CF-O-CFCl-CF2Cl

Into the equipment of the Example 1, maintained at a temperature of -80° C., 16.8 g of CF3C(O)CF3 are loaded. 1.7 Nl/h of fluorine diluited with nitrogen (molar ratio fluorine/nitrogen 1/2.5) and 1.5 Nl/h di CFCl=CFCl are then fed. The reaction is continued for 4 hours and at the end the reactor is discharged.The reaction mixture is analyzed by gaschromatography. It is found that both the conversions of CFC 1112 and of CF3C(O)CF3 are 100%. The reaction mixture is distilled. 19.5 g of a compound having formula (CF3)2-CF-O-CFCl-CF2Cl (19F NMR) are recovered. Selectivity with respect to CF3C(O)CF3 is 57.0% and with respect to CFC 1112 is of 20.9%. It is found that together with the synthesis of the above compound, also the fluorination raction of CFC 1112 to give CFC 114 and of fluorodimerization to CF2Cl-CFCl-CFCl-,CF2Cl took place in the reactor. Selectivity calculated with respect to CFC 1112, for the product CFC 114 is 62.7% and for the CFC 1112 dimer is 1.6%. The molar balance is 99% for CFC 1112 and 90% for CF3C(O)CF3.

References:

US2004/30146,2004,A1 Location in patent:Page 4