1‐Sila‐3‐alumina‐4‐aluminatacyclopentan mit Al–Al‐Bindung und C2Al2Si‐Heterocyclus

Werner Uhl, Uwe Schütz, Annegret Vester, Hans H. Karsch

Publikation: Beitrag in FachzeitschriftArtikelBegutachtung

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1‐Sila‐3‐alumina‐4‐aluminatacyclopentane with an Al–Al Bond and a C2Al2Si Heterocycle Tetrakis[bis(trimethylsilyl)methyl]dialuminium(4) (1) with an aluminium–aluminium bond reacts in the presence of tetramethylethylenediamine (TMEDA) with the sterically highly shielded bases bis(trimethylsilyl)methyllithium or bis(dimethylphosphanyl)methyllithium to yield under deprotonation of a methyl group a carbanionic species, which is stabilized by an interaction with one of the coordinatively unsaturated Al atoms. The five‐membered heterocycle 5 is formed containing two Al, one Si and two C atoms. The Al–Al bond remains uncleaved. Interestingly, 5 crystallizes in different crystals with and without crystal ether, which were both characterized by crystal‐structure determinations. The Al–Al bond length in 5 [264.1(2) and 266.5(3) pm, respectively] is only slightly changed in comparison to the neutral starting compound 1 (266.0 pm). Under similar conditions the sterically less demanding ethyllithium leads to a β‐elimination and addition of the thereby formed LiH to one of the two Al atoms to give the recently published hydridodialuminate(5) Li(TMEDA)2+ [R2Al–AlHR2] (2).

Seiten (von - bis)2637-2641
FachzeitschriftChemische Berichte
PublikationsstatusVeröffentlicht - Dez. 1993


  • Aluminium, three‐ and fourfold coordinated
  • Aluminium–aluminium bond
  • CAlSi heterocycle

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