1. As a result of the reaction between perfluorovinylmagnesium iodide and PCl3, AsCl3, and SbCl3, the corresponding tris-(trifluorovinyl)-phosphine, tris-(trifluorovinyl)-arsine, and tris-(trifluorovinyl)-stibine were obtained. 2. Amides of the type ClP(NR2)2 reacted smoothly with R'MgX (where R' is alkyl or perfluoroalkenyl) to form substituted amides of the alkyl or perfluoroalkenyl phosphinic acids. 3. Cleavage of amides of the type R'P(NR2)2 with dry hydrogen chloride led to the formation of primary and secondary chlorophosphines; in this way (C2H5)2PCl2, CF2=CFPCl2, (CF2=CF)2PCl were obtained. By exchange of chlorine with fluorine in the last two substances we obtained CF2=CFPF2 and (CF2=CF)2PF. 4. The reaction of perfluorovinylmagnesium iodide with 10-chloro-5, 10-dihydrophenarsine gave 10-perfluorovinyl-5, 10-dihydrophenarsine, which was converted into perfluorovinyldichloroarsine in the quantitative yield by liquid hydrogen chloride.