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.
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