Phosphorus‐Nitrogen Compounds: Novel Spirocyclic Phosphazene Derivatives. Structure of 3,3″‐Propane‐1,3‐diylbis[4′,4′,6′,6′‐tetrachloro‐3,4‐dihydrospiro[1,3,2‐benzoxazaphosphorine‐2,2′λ5‐[4λ5,6λ5][1,3,5,2,4,6]triazatriphosphorine]]

Abstract The reactions of N2O2‐donor‐type aminopodands1–3with trimer N3P3Cl6led to the novel spirocyclic phosphazene derivatives4–10(Scheme). Compounds4–7and8–10are the first examples of the substituted spiro‐ansa‐spiro and spiro‐bino‐spiro phosphazene derivatives, respectively. The pyrrolidinyl‐substituted phosphazene derivatives7and10were synthesized from5and9, respectively, with an excess of pyrrolidine. The reaction of aminopodand3(R(CH2)4) with N3P3Cl6in dry THF afforded only spiro‐ansa‐spiro phosphazene6. The molecular structure of compound9was determined by X‐ray diffraction: it shows the novel spiro‐bino‐spiro phosphazene architecture.