Syntheses and spectroscopic investigations of 2-pyridyl(N/N)spirocyclotriphosphazenes

Abstract

The Cl substitution reaction of N₃P₃Cl₆ (1) with N-(2-pyridyl)-methyl-N'-methylpropane-1,3-diamine (2) afforded the partly substituted 2-pyridyl(N/N)spirocyclotriphosphazene (3) (with a yield of 57%) in dry THF. When the Cl replacement reactions of 2 carried out with excess pyrrolidine, morpholine and 1,4-dioxa-8-azaspiro[4,5]decane (DASD), the corresponding 2-pyridyl(N/N)spirotetrapyrrolidino (3a), tetramorpholino (3b) and tetra(1,4-dioxa-8-azaspiro[4,5]decano) (3c) cyclotriphosphazenes were prepared in moderate yields. The structures of four cyclotriphosphazene derivatives were elucidated by the elemental analyses, Fourier transform infrared (FTIR), heteronuclear mass spectrometry (ESI-MS), heteronuclear multiple-bond correlation (HMBC), single quantum coherence (HSQC), ¹H, ¹³C, and ³¹P NMR techniques.

Keywords

• 2-Pyridyl(N/N)spirocyclotriphosphazenes,Replacement reactions,Spectroscopy

References

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