Phosphorus–nitrogen compounds. Part XXXII. The reaction of hexachlorocyclotriphosphazatriene with diphenylmagnesium in 1,4-dioxan

Abstract

Hexachlorocyclotriphosphazatriene, N₃P₃Cl₆, reacts with diphenylmagnesium in 1,4-dioxan to yield both cyclic (magnesium free) and acyclic phosphazenylmagnesium products. The former are represented by four compounds: hexaphenylcyclotriphosphazatriene, N₃P₃Ph₆; 2,2,4,4,6-pentachloro-6-(2′,2′,2′-triphenylphosphazen-1′-yl)-cyclotriphosphazatriene, N₃P₃Cl₅(NPPh₃); bi(2,2,4,4-tetrachloro-6-phenylcyclotriphosphazatrien-6-yl), (N₃P₃-PhCl₄)₂, and 2,2,4,4,6-pentachloro-6-[2′-phenyl-2′,2′-bis-(2″,2″,2″-triphenylphosphazen-1″-yl)phosphazen-1′-yl]cyclotriphosphazatriene, N₃P₃Cl₅[(NPPh₃)₂]. The latter are represented by a mixture of oligomeric materials so far not separated. The influence of the reactant stoicheiometry on the distribution of products is discussed, evidence is presented for the structure of the two new cyclic phosphazenes isolated, and a mechanistic scheme is tentatively put forward to account for these observations.