The reaction of Ph2P(NSiMe3)2Te(Cl)NR (R = PPh2NSiMe3) with ButNHLi in toluene at –78 °C produces the tellurium diimide dimer (ButNTeNR)2, which is shown by X-ray crystallography to consists of a planar four-membered Te2N2 ring with short exocyclic tellurium–nitrogen bonds.
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Chivers et al. (1994) studied this question.