Role of ring strain and steric hindrance in a new method for the synthesis of macrocyclic and high-polymeric phosphazenes

La polymerisation a 250 o C du tetrakis-trifluoroethoxy ferrocenylcyclotriphosphazene en presence d'une quantite catalytique d'hexachlorocyclotriphosphazene donne un poly(ferrocenylphosphazene) alors que la reaction du tetraphenoxy ferrocenylcyclotriphosphazene donne l'hexamere cyclique