Synthese und Kristallstruktur von Li2[(Me3SiCH2)3Al-CH2-Al(CH2SiMe3)3] — ein Addukt des Dilithiomethans CH2Li2?

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Abstract
Synthesis and Crystal Structure of Li2[(Me3SiCH2)3AlCH2Al(CH2SiMe3)3]—a Dilithiomethane Derivative?Reaction of (trimethylsilyl)methyllithium with the methylene‐bridged aluminium tetrachloride Cl2AlCH2AlCl2 yields dilithium methylenebis[tris(trimethylsilylmethyl)aluminate] (2) as the only isolable product. All attempts for preparing the tetraalkyl analogue have been unsuccessful. The crystal structure of 2 exhibits a hexacoordinated central carbon atom with short LiC distances. Both lithium atoms and the methylene hydrogens of the AlCH2 Al unit are almost coplanar. The discussion of the structure and properties leads to the attractive description of 2 as an adduct of tris(trimethylsilylmethyl)‐aluminium to dilithiomethane CH2Li2.