cas 27258-70-4, tetrakis(phenylethynyl)germane

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Facile synthesis of an unsaturated spiro germane by hydroalumination and intramolecular 1,1-carbalumination
Treatment of the tetraethynylgermanium compound Ge(C≡CC 6H5)4 4 with 2 equiv of H-Al[CH(SiMe 3)2]2 yielded the addition product Ge(C≡CC6H5)2[C{AlR2}=C(H) C6H5]2 (5, R = CH(SiMe3) 2) by reduction of two of its C≡C triple bonds. Heating of 5 to 260 °C for 10 min gave a unique rearrangement reaction which via intramolecular 1,1-carbalumination afforded the spiro germane 6 (a 3,7-bis[1-phenylmeth-(Z)-ylidene]-4-germaspiro[3,3]hepta-1,5-diene derivative). The molecular structure of 6 comprises two unsaturated 1-germacyclobut-2-ene heterocycles with a joint germanium atom and two exocyclic C=C double bonds.
Uhl, Werner,Rohling, Martina,Wuerthwein, Ernst-Ulrich,Ghavtadze, Nugzar,Bergander, Klaus
p. 5236 - 5240
(2010)
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Synthesis of tri-and tetraalkynylgermanes
A straightforward synthesis of tetra-and trialkynylgermanes by reactions of compounds containing Ge-N or Ge-Cl bonds with alk-1-ynes was proposed. Reactions of appropriate amino-or halogermanes with alk-1-ynes were effective only in the presence of an equivalent amount of zinc dihalide.
Andreev,Konshin,Vinokurov,Komarov
p. 1430 - 1432
(2007/10/03)