From the reaction of N3P3Cl6 with 1, 3-dihydroxypropane two isomeric N3P3Cl2[O(CH2)3O]2 derivatives were isolated, whose n.m.r. spectra suggest, and crystal structures prove, that they represent an example of dispiro/spiro–ansa isomerism, the first of its kind in phosphazene chemistry.
S. R. Contractor, M. B. Hursthouse, H. G. Parkes, L. S. Shaw (née Gözen), R. A. Shaw and H. Yilmaz, J. Chem. Soc., Chem. Commun., 1984, 675 DOI: 10.1039/C39840000675
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