John D. Hunt

Thallium in organic synthesis XVIII. Synthesis and spectroscopic studies of ArTlX2 and Ar2TlX compounds

General procedures for the preparation of arylthallium dichlorides and difluorides via the readily available arylthallium bis(trifluoroacetates) are described. The latter compounds have been found to undergo symmetrisation to the corresponding diarylthallium trifluoroacetates in variable yields when heated with water or acetone. A much improved, general synthesis of diarylthallium trifluoroacetates has been discovered, however, consisting simply of treatment of arylthallium bis(trifluoroacetates) with trimethyl phosphite. NMR and IR data for ArTlX2 and Ar2TlX compounds are presented, and their application to structure determination discussed.