Phosphorus–nitrogen compounds. Part XXXIV. The reactions of hexachlorocyclotriphosphazatriene with ethylamine: comparisons with isopropylamine and t-butylamine

Abstract

Hexachlorocyclotriphosphazatriene, N₃P₃Cl₆, reacts with ethylamine in boiling ether, benzene, or chloroform, to give the ethylamino-derivatives, N₃P₃Cl_{6 –n}(NHEt)_n(n= 1, 2, 2, 3, 4, 6), a hydrochloride, N₃P₃(NHEt)₆,HCl, and an ethoxy-derivative, N₃P₃Cl₂(NHEt)₃(OEt). Dimethylaminoethylamino-derivatives, N₃P₃(NMe₂)_{6 –n}(NHEt)_n[n= 1, 2 (2 isomers), 3 (2 isomers), 4 (3 isomers), 5] and N₃P₃(NMe₂)₂(NHEt)₃(OEt) are prepared from the chloroethylamino- and/or chlorodimethylamino-derivatives. The structures of the products are deduced from their ¹H n.m.r. spectra and their pk′_a values. The replacement patterns of chlorine in N₃P₃Cl₆ by ethyl-, isopropyl-, and t-butyl-amines are compared and a hypothesis is put forward to rationalise the differences.