Synthesis and characterisation of 2, 4, 6-tri-t-butylphenylphosphines; X-ray structure of [P(C6H2But3-2,4,6)S]3

Abstract

Whereas treatment of phosphorus(III) chloride with an equimolar portion of LiAr (Ar = C₆H₂Bu^t₃-2, 4, 6) affords PArCl₂, with 2LiAr there is obtained ArPPAr, which has Low-lying MO′s (photoelectron spectroscopy) and a LUMO (reversible electrochemical 1-electron reduction); other reactions of LiAr lead to PAr(Cl)X [X - CH(SiMe₃)₂(and a 1-phosphabenzocyclopentene therefrom), Ph, C₆H₂Me₃-2, 4, 6(interesting variable temperature n.m.r. spectra), or OC₆H₂Bu^t₃-2, 4, 6], or the puckered six-membered (PS)₃ cyclic title compound (ring torsion angles all 80° with the S atoms 1.0 A out of the P₃ plane ) which with PPh₃ yields ArPPAr.