Hexa(2-formylphenoxy)cyclotriphosphazene (o-CHO-C 6 H 4 O) 6 N 3 P 3 (2) was obtained from the reaction of hexachlorocyclotriphosphazene (1) with salicylaldehyde in the presence of K 2 CO 3 in THF solvent. A series of Schiff bases containing cyclotriphosphazenes such as [

The asymmetric unit of the title compound contains two crystallographically independent mol­ecules with the similar conformation, the piperidine rings in both mol­ecules adopt a similar distorted chair conformation and have pseudo mirror planes passing through the N—O bond.