CH–NH Tautomerism in the Products of the Reactions of the Methanide [HC(PPh2NSiMe3)2]− with Pnictogen and Tellurium Iodides

The reactions of K[HC(PPh2NSiMe3)2] (K[1]) and MI3 (M = As, Sb) or TeI4 gave as the major products the complexes [{MI n }{C(PPh2NSiMe3)(PPh2NHSiMe3)}] (MI n = trans-AsI2, trans- or cis-SbI2, TeI3), which feature the ligand [C(PPh2NSiMe3)(PPh2NHSiMe3)]− (2). This anion, the NH tautomer of [HC(PPh2NSiMe3)2]−, is formally generated by a 1,3-hydrogen shift to give complexes in which the ligand is N,C-chelated to the main-group-metalloid center. The …