Synthesis of diiodoperfluoro-C

1. A process comprising forming a stable mixture comprising I(CF 2 ) n I, wherein n is at least 3 and at least one of I(CF 2 ) n I, wherein n is 1 or 2, as a contaminant in said mixture and heating said mixture to a temperature of at least 220° C. to reduce the amount of said contaminant to be no greater than 1% when said contaminant is ICF 2 I and no greater than 0.1% when said contaminant is ICF 2 CF 2 I.

2. The process of claim 1 wherein said stable mixture is the reaction product of a chemical reaction in a reactor.

3. The process of claim 2 wherein said chemical reaction is without the need for catalyst being present.

4. The process of claim 1 wherein said stable mixture contains I(CF 2 ) 3 I as the predominant component.

5. The process of claim 4 wherein said chemical reaction is between iodine and hexafluoropropylene oxide.

6. The process of claim 5 wherein said I(CF 2 ) n I, wherein n is at least 3 is the homologue mixture of I(CF 2 ) n I wherein n is 3 to 7 and said I(CF 2 ) n I, wherein n is 3, comprises at least 70% of said homologue mixture.

7. The process of claim 6 wherein the yield of said homologue mixture is at least 70%.

8. The process of claim 7 wherein said chemical reaction between said iodine and said hexafluoropropylene oxide is carried out at a temperature of 150° C. to 210° C. prior to heating said mixture to a temperature of at least 220° C.

9. The process of claim 8 wherein the molar proportion of said hexafluoropropylene oxide to said iodine in said chemical reaction is at least 3.0.

10. The process of claim 8 wherein the molar proportion of said hexafluoropropylene oxide to said iodine in said chemical reaction is at least 3.3.