“…The synthesis of perfluorobutanesulfonamide 1a and perfluorooctanesulfonamide 1c were described previously [15]. 2F, (CF 3 CF 2 (CF 2 ) 4 )), À122.37 (m, 2F, (CF 3 CF 2 CF 2 (CF 2 ) 3 )), À121.45 (m, 2F, (CF 3 (CF 2 ) 2 CF 2 (CF 2 ) 2 )), À119.79 (m, 2F, (CF 3 (CF 2 ) 3 CF 2 CF 2 )), À113.79 (m, 2F, (CF 3 (CF 2 ) 4 CF 2 )), À80.77 (m, 3F, (CF 3 (CF 2 ) 5 )); MS (FAB À , NBA): [M À H þ ] ¼ 398; HRMS calcd for C 6 …”