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

Abstract

A series of aminocyclodiphosph(III)azanes (R1R2N)[graphic ommitted]But(R1= H, alkyl, or SiMe3; R2= alkyl) have been prepared by the reactions of [graphic ommitted]But 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.