Bromopentafluorobenzene

Bromopentafluorobenzene is an organofluorine compound with the formula C6F5Br. It is a colorless liquid that is used to prepare pentafluophenyl compounds. These syntheses typically proceed via the intermediacy of C6F5Li or the Grignard reagent. Illustrative is preparation of tris(pentafluorophenyl)borane:
 * 3 C6F5MgBr +  BCl3   →  (C6F5)3B  +  3 MgBrCl

Other derivatives include LiB(C6F5)4, [CuC6F5]4, and Ni(C6F5)2(dioxane)2.