Reactions of tris- and tetrakis-dimethylaminochlorotetraphosphonitriles with antimony trifluoride

Abstract

Three non-geminally substituted isomers of both P₄N₄F₄(NMe₂)₄ and P₄N₄F₃(NMe₂)₅ have been prepared by treating the corresponding chlorides with antimony trifluoride. The former have been separated and assigned structures (VI)–(VIII) on the basis of ¹H and ¹⁹F n.m.r. spectra and g.l.c. retention time data. The tetrafluorides react further with antimony trifluoride giving three isomeric pentafluorides (IX)–(XI) by substitution of an amino-group. A mechanism is postulated for the fluorination reaction which involves the formation of an SbF₃ adduct and the possibility of isomerization as chlorine substitution takes place.