Contact vs solvent‐separated ion pairs: a 7Li and 13C solid‐state NMR study of organolithium compounds
作者： Martin Kühnen , Harald Günther , Jean-Paul Amoureux , Christian Fernandéz
DOI: 10.1002/MRC.980
关键词:
摘要: 7Li and 13C solid-state magic angle spinning NMR spectra were measured for three benzyllithium systems, α-(phenylthio)benzyllithium, α-phenyl-α-lithiodithiane α-(trimethylsilyl)benzyllithium, stabilized by different ligands (THF, PMDTA, TMEDA, [12]crown-4). They analyzed with respect to the quadrupole parameters χ(7Li) η(7Li) chemical shifts δ(6,7Li) δ(13C), respectively. On basis of X-ray solution data from literature, it is shown that solvent-separated ion pairs (SIP) can be distinguished contact (CIP) magnitudes typical δ(13C). Systems 2 mol equiv. crown ether ligand [12]crown-4 exist exclusively as SIP structures show values 80 kHz. Copyright © 2001 John Wiley & Sons, Ltd.
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