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Solvent and temperature studies of some indenyl‐ and fluorenyllithiums using 13 C NMR spectroscopy
Author(s) -
Edlund Ulf
Publication year - 1979
Publication title -
organic magnetic resonance
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0030-4921
DOI - 10.1002/mrc.1270121203
Subject(s) - solvent , chemistry , solvation , ion , nuclear magnetic resonance spectroscopy , spectroscopy , nmr spectra database , solvent effects , spectral line , computational chemistry , analytical chemistry (journal) , organic chemistry , physics , quantum mechanics , astronomy
13 C NMR spectra of indenyl‐ and fluorenyllithium and some of their methyl substituted derivatives have been obtained. The shielding differentials induced by varying the temperature or coordinating ability of the solvent are discussed in terms of an equilibrium between discrete ion pairs or differences in external solvation. An increase of the coordinating ability of the solvent induces shift differentials of similar signs as those given by lowering the temperature. Methyl substituents close to the cation location are found to have only a minor effect on the observed ion pair ratio but seem to influence the preferred cation position in the tight ion pair structure.