Synthesis and Characterization of Side Group–Modified Cyclotetraphosphazene Derivatives

Abstract

Two novel cyclotetraphosphazene derivatives were synthesized by the reaction of octachlorocyclotetraphosphazene with the potassium salt of 4-hydroxybenzaldehyde, and subsequent reduction of aldehyde groups to alcohol groups using sodium borohydride. The bromination reaction was carried out using PBr₃ to give N₄P₄(OC₆H₄-p-CH₂Br)₈ (4). This compound was employed in reaction with imidazole or morpholine to produce eight-armed, star-branched title compounds. The target compounds were characterized by ¹H, ³¹P, and ¹³C NMR as well as IR and ESI-MS. The Cu complex of 5a was effective in oxidative cleavage reactions.

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GRAPHICAL ABSTRACT

Keywords:

• Cyclotetraphosphazene
• imidazole
• morpholine
• synthesis

Acknowledgements

The authors would like to thank the Natural Science Foundation of China (Nos. 20972143, 20602032, 20732004, 20972130) for financial support.