Processes for manufacturing monomer of formula CF3OCF2OCF=CF2

摘要

The invention pertains to a process for manufacturing a monomer of formula: CF 3 OCF 2 OCF=CF 2 , said process comprising the following steps:
I obtaining fluoroformate of formula CF 3 OCOF ;
II reacting said fluoroformate with elemental fluorine and with olefinic compounds having formula :
€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ CAF=CA'F€ƒ€ƒ€ƒ€ƒ€ƒ(IV)
for obtaining the fluorohalogenether of formula
€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ CF 3 OCF 2 OCFACF 2 A'€ƒ€ƒ€ƒ€ƒ€ƒ(V)
wherein A and A', equal to or different the one from the other, are H, Cl or Br, with the proviso that both are not H ; the temperature being
between -120°C and -20°C ;
III removing the substituents A and A' from the fluorohalogenether (V);
wherein in step I the fluoroformate CF 3 OCOF is prepared by reaction of CF 3 OF with CO at temperatures between 80°C and 250°C.