Röntgenstrukturuntersuchung von α‐(Trimethylsilyl)benzyllithium·Tetramethylendiamin [C6H5CH(SiMe3)Li·TMEDA] und α‐(Phenylthio)‐benzyllithium·3 Tetrahydrofuran [C6H5CH(SPh)Li·(THF)3] – zwei zentral‐chirale Benzyllithium‐Verbindungen
作者： Wolfgang Zarges , Michael Marsch , Klaus Harms , Gernot Frenking , Gernot Boche
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摘要: Crystal Structure of α-(Trimethylsilyl)benzyllithium·Tetramethylethylendiamin [C6H5CH(SiMe3)Li·TMEDA] und α-(Phenylthio)-benzyllithium·3 Tetrahydrofuran [C6H5CH(SPh)Li – (THF)3] Two Benzyllithium Compounds with Central Chirality The crystal structure analyses (6) and [C6H5CH(SPh)Li·(THF)3] (7, in which the positions benzylic hydrogen atoms have been determined experimentally, reveal compounds pyramidal carbon atoms. In 6 lithium is λ2-bound to Cipso α substituted anion leads, together TMEDA molecule, a tetra-coordinated atom. 7 only one Li C bond formed, namely that Cα. Additional coordination three THF molecules results also tetracoordinated atom, The extent pyramidalization qualitatively agreement quantum-mechanical ab initio calculations [G86, MP2/6-311+ + G(d,p)].
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