UEBER POLYGERMANE. XV. DARSTELLUNG VON PHENYLIERTEN TRIGERMANEN IN HMPT

Article abstract of DOI:10.1016/S0022-328X(00)99705-5

The optimum conditions for the synthesis of the trigermanes Ge3Ph8 and Ge3Me2Ph6 according to R2GeCl2 + 2 Ph3GeAk (Ak = Li, K) in HMPT have been determined.The main difficulty is to repress a nucleophilic attack of Ph3Ge^- at newly formed Ge-Ge bonds.The mass spectrum of Ge3Me2Ph6 shows rearrangements of the GePh3 and Ph/Me groups.The 13C NMR phenyl signals of di-, tri- and tetra-germanes are nearly identical.Ge3Ph8 and Ge4Ph10 transform to the plastically-crystalline state before melting (ΔH 45.3 and 54.9 kJ mol^-1).The crystal structure of Ge3Me2Ph6 has been determined.The molecule has C₂ symmetry (Ge-Ge 242.9(1) pm, Ge-Ge-Ge 120.3(1) deg).