Dope it with germanium: selective access to functionalized Si 5 Ge heterocycles.

The Cl diadduct [BuN][A·2Cl] of the mixed cyclohexatetrelane (SiCl)(GeMe), A, is accessible from MeGeCl, 6 eq. SiCl, and 2 eq. [BuN]Cl in one step (96%). Free, tenfold functionalized A can be released from the primary product by decomplexation with AlCl (78%). Insight into the assembly mechanism of [BuN][A·2Cl] and the reactivity of A is provided.