The reactions of various dihalogenogermanes with Mg and MgBr2 in tetrahydrofuran produce the corresponding cyclotrigermanes and cyclotetragermanes; the ring size of the products depends on the steric bulk of substituents on germanium.
W. Ando and T. Tsumuraya, J. Chem. Soc., Chem. Commun., 1987, 1514 DOI: 10.1039/C39870001514
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