Abstract
The synthesis and characterization of new stable divalent germanium, tin, and lead homoleptic species (ArO)2M: (Ar = 2,4,6-[(CH3)2NCH2]3C6H2; M = Ge (2), Sn (3), Pb (4)) are described. 2−4 were obtained in good yields by alcoholysis of the M−N bonds of the divalent precursors [(Me3Si)2N]2M by ArOH. However, the direct reaction of 2 equiv of [2,4,6-tris((dimethylamino)methyl)phenoxy]lithium trimer (1) with the divalent species MCl2 resulted in the formation of 2−4 in lower yields along with the cluster Li5(ArO)2Cl3. The coordination behavior of the (dimethylamino)methyl side chains toward the metal atom was studied by variable-temperature NMR spectroscopy; on the NMR time scale 2 in solution exhibits a temperature-dependent N···M···N coordination mode. The chemistry of 2−4 is illustrated through their reactions with diphenylethanedione, 1,2- and 1,4-benzoquinones, and triazolinedione.
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