Improved and facile addition reactions of pentafluorosulfanyl bromide

A solution of SF5Br in CCl3F (0.5–1 M) was utilized to effect the addition of pentafluorosulfanyl bromide (SF5Br) to olefins. The reaction of the SF5Br solution in the presence of triethylborane (0.1 equiv) with an olefin over 20 min at 0 °C gave pentafluorosulfanylated compound 2(a–f) in high yield (Table 2). An efficient route for the preparation of synthetically useful SF5-containing esters is also described.