Chloro-cyclophosphazenes

Fig. 8. Mechanistic pathways involved in the chlorine replacement reaction of chloro-cyclophosphazenes (A) = S 2 (non-polar) (B) = S 2 (concerted) (C) = S l (D) = SnI(CB).

The 19F NMR spectroscopic data for trifluoroethoxy derivatives, N3P3R6 n(OCH2CF3)n (R = alkylamino, dialkylamino, alkoxy) can be used as an indirect method of establishing the structures of the chloro-cyclophosphazene precursors, N3P3R6 C1 (63, 139), but this technique has received very little attention. 

Chloro and bromo cyclophosphazenes are generally prepared by the reaction of chloro or bromophosphoranes with ammonium halides [15] (Eq. 2 and Scheme 1). Special methods are also available for the synthesis of chlorocyclophos-phazenes (Scheme 1). In these reactions cyclic oligomers and linear products are formed, and the former compounds are easily separated from the mixture because of their greater solubility in petroleum solvents. Maximization of cyclic... 

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