abstract |
A perfluorolactone having the formula ##STR1## wherein n is an integer of 2 to 4, is produced by reacting a fluoro compound having the formula n n I(CF.sub.2).sub.n COX n n wherein n is an integer of 2 to 4 and X represents a halogen atom, --OR or --NR 1 R 2 , and R, R 1 and R 2 respectively represent hydrogen atom or a C 1 - C 10 alkyl group, with fuming sulfuric acid. |