Abstract
Vinyllithium (ViLi; isotopically labeled with 6 Li) is an 8:1 tetramer/dimer equilibrium in tetrahydrofuran-d 8 (THF-d 8 ) at -90 o C (1.6 M solution). In the presence of equilmolar amounts of TMEDA (tetramethylethylenediamine), the tretramer:dimer ratio is 1:13 in THF-d 8 at -80 o C (1.9 M solution). Dynamic NMR phenomena are observed in the ViLi tetramer: at -90 o C in THF-d 8 , a static aggregate is found, whereas at -60 o C rapid intraaggravate exchange of the four lithium sites indicates a fluxional tetramer
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