What is "cyclodiphosphazane"

A cyclodiphosphazane is a type of chemical compound and a saturated four membered PN ring and one of the major classes of cyclic phosphazene compounds. Bis(chloro)cyclodiphosphazanes, cis-[ClP(μ-NR)] are important starting compounds for synthesizing a variety of cyclodiphosphazane derivatives by nucleophilic substitution reactions; are prepared by reaction of phosphorus trichloride (PCl) with a primary amine (RNH) or amine hydrochlorides (RNHCl).

Organic substituents on nitrogen play an important role in formation of cyclicphosphazane compounds. The cyclic tetramers (I) and trimer (II) are formed with organic substituents such as methyl and ethyl on nitrogen, whereas formation of cyclic dimers cis-[ClP(μ-NR)] have been observed exclusively with more sterically demanding primary amines such as ''t''-BuNH and PhNH.