The Cl atoms in polydi(chloro) and cyclo phosphazenes prepd. by polymn. of a cyclic trimer (NPCl2)(3) at 240 degrees C/18-22 hm, were substituted with org. groups in 24 hrs/20 degrees C reactions with Et 4-hydroxy (or 4-amino) benzoate or aniline trimer. These groups were hydrolyzed in THF contg. t-BuOK to form catalyst supports. The supports were used as themselves or were doped with CoCl2 or Ni(NO3)(2). When tested in oxidn. of trans-stilbene with atm. O-2 at 60 degrees C/1 bar, each support was feebly active, max. poly(dibenzoxy)phosphazene (I). Each catalyst was active, esp. the Ni, in epo)ddation yielding 2,3-diphenyloxirane. The I-supported catalyst, 20 mg in MeCN + 10 mmols 2-methylpropanal to reduce the catalytic center, gave 1000% conversion, selectivity similar to 70%. With Co, the reaction time, 2 hrs., was shorter than with Ni, 5 hm On the 2nd use of the catalyst, the reaction time was longer, but the conversion remained unaffected.