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Röntgenstrukturuntersuchung von α‐(Trimethylsilyl)benzyllithium·Tetramethylendiamin [C 6 H 5 CH(SiMe 3 )Li·TMEDA] und α‐(Phenylthio)‐benzyllithium·3 Tetrahydrofuran [C 6 H 5 CH(SPh)Li·(THF) 3 ] – zwei zentral‐chirale Benzyllithium‐Verbindungen
Author(s) -
Zarges Wolfgang,
Marsch Michael,
Harms Klaus,
Frenking Gernot,
Boche Gernot,
Koch Wolfram
Publication year - 1991
Publication title -
chemische berichte
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 0009-2940
DOI - 10.1002/cber.19911240321
Subject(s) - chemistry , tetrahydrofuran , trimethylsilyl , lithium (medication) , crystal structure , molecule , ab initio , stereochemistry , crystallography , chirality (physics) , ab initio quantum chemistry methods , medicinal chemistry , organic chemistry , medicine , chiral symmetry breaking , physics , quantum mechanics , solvent , quark , nambu–jona lasinio model , endocrinology
Crystal Structure of α‐(Trimethylsilyl)benzyllithium·Tetramethylethylendiamin [C 6 H 5 CH(SiMe 3 )Li·TMEDA] und α‐(Phenylthio)‐benzyllithium·3 Tetrahydrofuran [C 6 H 5 CH(SPh)Li – (THF) 3 ] – Two Benzyllithium Compounds with Central Chirality The crystal structure analyses of [C 6 H 5 CH(SiMe 3 )Li·TMEDA] ( 6 ) and of [C 6 H 5 CH(SPh)Li·(THF) 3 ] ( 7 , in which the positions of the benzylic hydrogen atoms have been determined experimentally, reveal compounds with pyramidal benzylic carbon atoms. In 6 lithium is λ 2 ‐bound to C ipso and α of the substituted benzylic anion which leads, together with the TMEDA molecule, to a tetra‐coordinated lithium atom. In 7 only one Li – C bond is formed, namely that to C α . Additional coordination with three THF molecules results also in a tetracoordinated lithium atom, The extent of the pyramidalization in 6 and 7 is qualitatively in agreement with quantum‐mechanical ab initio calculations [G86, MP2/6‐311+ + G(d,p)].