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NMR spectroscopy of organolithium compounds. XXVI—The aggregation behaviour of methyllithium in the presence of LiBr and LiI in diethyl ether and tetrahydrofuran

✍ Scribed by Thomas Fox; Heike Hausmann; Harald Günther

Publisher: John Wiley and Sons
Year: 2004
Tongue: English
Weight: 197 KB
Volume: 42
Category: Article
ISSN: 0749-1581
DOI: 10.1002/mrc.1443

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✦ Synopsis

Abstract

^1^H, ^6^Li and ^13^C NMR spectroscopy were used to determine the structure of aggregates formed in mixtures of methyllithium, H~3~CLi, and lithium bromide and iodide in diethyl ether and tetrahydrofuran. From the chemical shifts, the signal intensity distribution and the isotope shifts observed for partially deuterated systems, it was shown that generally tetrameric structures with different halogen contents dominate. For methyllithium–lithium bromide (1:1) in THF a considerable concentration of an H~3~CLiLiBr dimer was found. For the first time, deuterium‐induced ^6^Li isotope shifts over four bonds were observed. Copyright © 2004 John Wiley & Sons, Ltd.

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