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Without being able to stop the reaction on the first or second stage, trisamino substituted cyclotri(λ 3  -phosphazanes) (2) can be shown to add always three mole equivalents of sulfur under very mild reaction conditions to give cyclotri(λ 5  -phosphazanes) (3). Suggesting the reaction to be stereospecific, 3 shows the same  31 P NMR pattern as the starting materials 2. From this result and from molecular models, 3a-c as well as 2a-c are assumed to have diequatorial axial-substitution, whereas the bicyclic 2d and 3d are likely to have their phosphorus substituents in a diaxial-equatorial position.

Die Oxidation von aminosubstituierten Cyclotri(λ 3 -phosphazanen) mit Schwefel / Sulfur Oxidation of Amino Substituted Cyclotri( λ 3 -phosphazanes)