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