NMR studies have shown that the hexenyllithium compound 4 exists at –80 °C in THF solution as two distinct species: the ‘normal’ THF solvated alkyllithium compound 4a and the internally π-complexed species 4b in a ratio of 5.5:1.
T. Rölle and R. W. Hoffmann, J. Chem. Soc., Perkin Trans. 2, 1995, 1953 DOI: 10.1039/P29950001953
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