Abstract
Proton NMR linewidths have been measured for 7LiC 2H 5 and 6LiC 2H 5 in toluene solution in the temperature range +4 to −40°. The proton lines in samples prepared from 3Li are narrower than in the 7Li samples, indicating the existence of a scalar Li-CH coupling. The 7Li NMR linewidths have been measured as a function of temperature for LiC 2H 5, LiC 2D 5 and LiC(CH 3) 3 in toluene solution in the temperature range +23 to −42°. The results indicate a slow intermolecular exchange of alkyl groups in the entire temperature range. From the temperature dependences of the linewidths, quadrupolar coupling constants eqQ/h of 0.57 and 0.14 mc have been estimated for ethyllithium and tert-butyllithium respectively.
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