Abstract (C 2 F 5) 2 PNEt 2 represents an excellent starting material for the selective synthesis of bis (pentafluoroethyl) phosphane derivatives. The moderately air-sensitive aminophosphane is accessible on a multi-gram scale by treating Cl 2 PNEt 2 with C 2 F 5 Li. Treatment with gaseous HCl or HBr yielded the corresponding phosphane halides (C 2 F 5) 2 PCl and the so far unknown (C 2 F 5) 2 PBr in good yields. The hitherto unknown (C 2 F ...