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Carbon‐13 n.m.r. characterization of indenyllithium in solution
Author(s) -
Edlund Ulf
Publication year - 1977
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.1270091009
Subject(s) - protonation , solvent , ion , chemistry , chemical shift , carbon fibers , characterization (materials science) , solvent effects , electron density , computational chemistry , electron , chemical physics , organic chemistry , materials science , nanotechnology , physics , quantum mechanics , composite number , composite material
13 C N.m.r. chemical shifts obtained for indenyl‐ and cyclopentadienyllithium in several, mostly ethereal, solvents are presented. The chemical shift changes induced by varying the solvent are assumed to probe the actual π‐electron density distribution, thus providing an insight into the structure of the ion‐pair. The increase in the estimated π‐electron densities obtained for the protonated aromatic carbons of indenyllithium by increasing the coordinating ability of the solvent gives evidence of a change of the ion‐pair equilibrium towards solvent‐separated species. The average chemical shifts for indenyl‐ and cyclopentadienyllithium were independent of the choice of solvent, a fact which supports the ion‐pair model in all studied media.