Abstract: Chloroperoxytrifluoromethane, CF300C1, undergoes addition reactions with olefins to yield trifluoromethylperoxy derivatives in high yield. The reactions are unidirectional and proceed by an electrophilic mechanism, in which the positive chlorine of CF3OOC1 adds to the carbon with the greatest number of hydrogens or the fewest fluorines. Reactions with C2H4. C2F4, C2F3C1, CF2CC12, CF2CH2, and cis-CFHCFH occur ...