Cyclic inorganic compounds. Part XIII. The non-geminal bromofluoro-and chlorofluoro-cyclotriphosphazenes

Abstract

Cyclotriphosphazenes substituted non-geminally by fluorine and either chlorine or bromine have been prepared. The compounds, with general formula P₃N₃F_nX_{6 –n} where X = Cl or Br and n= 2–4, result from reactions under pressure between either hydrogen chloride or bromide and dimethylaminofluorocyclotriphosphazenes. The more volatile chlorofluoro-compounds can be prepared at atmospheric pressure by passing hydrogen chloride through a refluxing solution of the aminofluoride in nitrobenzene. In all cases, pairs of cis–trans-isomers are obtained. Structures have been assigned to the products on the basis of ¹⁹F n.m.r. Spectra.