P-perhalogenated cyclotri(λ 3 -phosphazanes) 3 a, b are obtained from the reaction of 1 or 2 with excess PX 3 (X = Cl, Br). Under mild reaction conditions 4-7 are found to be intermediates. The existence of a six-membered ring trimer is proven by NMR and mass spectroscopy. No dimer (XPNMe) 2 could be detected.
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Zeiß et al. (1979) studied this question.