synthesis and difluorination of hypervalent tetraaryltellurium(iv)
ICHAC-XI, International Conference on Heteroatom Chemistry Caen (France), 14-19 June 2015 SYNTHESIS AND DIFLUORINATION OF HYPERVALENT TETRAARYLTELLURIUM(IV) BEARING DIMETHYLAMINOPHENYL LIGANDS Number (to be inserted by us) Kotona HAYAKAWA, Sho KOBAYASHI, Mao MINOURA* Department of Chemistry, College of Science, Rikkyo University, 3-34-1 Nishiikebukuro, Toshima-ku, Tokyo 171-8501, Japan e-mail: [email protected] Hypervalent group 16 element compounds bearing all carbon ligands are less explored due to their instability. Tetraorganotellurium(IV) having electron-donating ligands have also been known as unstable compound compared with the electron-withdrawing ligands. In this paper, we report the synthesis and characterization of tetraaryltellurium, [Ar4Te, Ar = (H3C)2N-C6H4-] and oxidative difluorination with XeF2. The synthesis of Ar4Te(IV) was achieved by the reaction of TeCl4 and ArLi which was prepared as yellow solid. The Ar4Te was isolated as pale yellow crystals and easily reacted with moisture to give the corresponding telluronium salt. The oxidative difluorination of Ar4Te(IV) was proceeded by the reaction Ar4Te with XeF2 at -40 °C. The systematic structural comparison of Ar4Te [Ar = R-C6H4, R = F3C, H, H3C, (H3C)2N] and 125Te-19F coupling constants of Ar4TeF2 will be discussed. NMe2 NMe2 Li TeCl4 NMe2 Et2O Me2N Te XeF2 / MeCN Me2N Te THF Me2N F F Me2N NMe2 NMe2
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