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Reactions of triphenylphosphine and tributylphosphine with tetraethylthiuram disulfide and diethyldithiocarbamate complexes of tellurium(II) and tellurium(IV)
Gopalaswamiengar Aravamudan, M. Ramakrishna Udupa
Published in
Volume: 114
Issue: 1-4
Pages: 39 - 49
Triphenylphosphine reduces tetrakis(diethyldithiocarbamato)tellurium(IV), TeL4 [L = diethyldithiocarbamate, (C2H5)2NCS-2] to the tellurium(II) complex TeL2, on which PPh3 has no effect. The reaction of the tellurium(IV) complex, TeL2X2 (X = I, Br, Cl) with PPh3 in the molar ratio of 1:1 results in the formation of TeLX, CS2 and an aminophosphonium halide, (C2H5)2NP+Ph3X -. Another mole of PPh3 reduces TeLX further to elemental tellurium. The reactions of TeL3X (X = I, ClO4, PF6) systems with excess PPh3 lead interestingly to the formation of TeL2 and elemental tellurium, with the concomitant formation of CS2, (C2H5)2NEP+Ph3X - and (C2H5)2NC(S)P+Ph3X -. The reactions were performed in dichloromethane solutions and 31P NMR spectroscopy was widely used for the identification of various phosphorus containing species.
About the journal
JournalPhosphorus, Sulfur and Silicon and Related Elements
Open AccessNo