New aminocyclodiphosph(III)azanes and the influence of geometrical isomerism on their properties

Abstract

A series of aminocyclodiphosph(III)azanes (R¹R²N)[graphic ommitted]Bu^t(R¹= H, alkyl, or SiMe₃; R²= alkyl) have been prepared by the reactions of [graphic ommitted]Bu^t with primary or secondary amines, or with NMe(SiMe₃)₂. In some cases geometrical isomers have been separated by fractional crystallisation and thermal methods. Other cyclodiphosph(III)azanes, (Me₂N) [graphic ommitted]R (R = Me or Et), have been synthesised by heating diphosphinoamines (Me₂N)₂P–NR–P(NMe₂)₂(R = Me or Et)in vacuo. Selected physical (¹H, ¹³C, ³¹P n.m.r., i.r., dipole-moment, and mass-spectral) properties of these derivatives are reported and discussed.