Nonaflate
Chemical compound
Nonaflate, CF
₃CF
₂CF
₂CF
₂SO⁻
₃, is the common name given to nonafluorobutanesulfonates, the salts or esters of perfluorobutanesulfonic acid. Its uses are similar to those of triflate.
It is a good leaving group. It is a substitute for more toxic... Wikipedia