Cyclic phosphines and arsines. IV. Perfluoroalkyl-substituted cyclic phosphines

Abstract

Diiodopentafluoroethylphosphine and iodobispentafluoroethylphosphine have been prepared. Reaction of these compounds with silver chloride and silver cyanide leads to replacement of the iodide to give chloro and cyano phosphines.

Reaction of RPI₂ (R = CBF₅, C₃F₇) with mercury gives the cyclic phosphine (PR)_4,5. Conversion of (PC₂F₅)₅ into(PC₂F₅)₄ occurs irreversibly a t room temperature on standing for several days and can be followed by n.m.r. No analogous rearrange- ment was found for (PC₃F₇)₅. Both ³¹P and ¹⁹F n.m.r. spectra for the cyclic phosphine are discussed and compared with those for (PCF₃)_4,5.