Non-arylic diorganothallium derivatives obtained by metallation. Synthesis and isolation of the first diketonylthallium(III) complexes

Abstract

Addition of trifluoroacetic or trifluoromethanesulfonic acid to solution of thallium(III) trifluoroacetate in acetone results in formation of the compounds [Tl{CH₂C(O)Me}₂X](X = CF₃CO₂1a or CF₃SO₃1b. Compound 1b reacts in a 1 : 1 ratio with LiCl or KBr giving the halogeno derivatives [Tl{CH₂C(O)Me}₂Y](Y = Cl 2a or Br 2b). Compound 2a reacts with [N(PPh₃)₂]Cl yielding the anionic complex [N(PPh₃)₂][Tl{CH₂C(O)Me}₂Cl₂]3. The reaction of 1b with 2,2′-bipyridine (bipy) gives [{Tl[CH₂C(O)Me]₂(µ-CF₃SO₃)(bipy)}₂]4 in which each thallium atom has a distorted six-co-ordination with the acetonyl ligands in trans positions and two cis positions occupied by two bridging triflate anions.