Abstract
AbstractThe synthesis of germanium(II) 2‐tert‐butyl‐4‐methyl‐6‐(oxidomethyl)phenolate (1) starting from Ge[N(SiMe3)2]2 and the corresponding salicyl alcohol is reported. Compound 1 undergoes an intramolecular oxidative insertion reaction of germanium into a C–O bond to result in a cyclic germanium(IV) tetraoxidogermocane (2). Addition of 3‐tert‐butyl‐2‐hydroxy‐5‐methylbenzyl alcohol to either compound 1 or 2 gave a spirocyclic monoorgano dioxagermine (3). The results of 1H NMR spectroscopic studies and DFT‐D calculations are in agreement with the proposed reaction cascade in which the novel germylene 1 is first converted into the germocane 2 followed by reaction with 3‐tert‐butyl‐2‐hydroxy‐5‐methylbenzyl alcohol to finally provide compound 3. Addition of 4‐(dimethylamino)pyridine to a solution of germylene 1 resulted in the formation of an air‐stable monomeric 1:1 complex (4). The characterization of compounds 1–4 by single‐crystal X‐ray diffraction analysis, thermal analysis, and 1H NMR, 13C{1H} NMR, and ATR‐FTIR spectroscopy is presented.
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