| abstract |
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: nI obtaining fluoroformate of formula CF 3 OCOF ; nII reacting said fluoroformate with elemental fluorine and with olefinic compounds having formula : n n CAF=CA'F (IV) n nfor obtaining the fluorohalogenether of formula n n CF 3 OCF 2 OCFACF 2 A' (V) n nwherein 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 nbetween -120°C and -20°C ; nIII removing the substituents A and A' from the fluorohalogenether (V); nwherein 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. |