Proton resonance spectra are reported for mixtures of methyl- and ethyl-zinc iodide with the corresponding bisalkylzincs in tetrahydrofuran solution. At low temperatures, alkyl exchange is slow on a proton resonance timescale. For the Schlenk equilibria R2Zn + Znl2⇌ 2RZnl K is ![[gt-or-equal]](https://www.rsc.org/images/entities/char_2a7e.gif)
500 at –70 °C, in agreement with previous results.
D. F. Evans and G. V. Fazakerley, J. Chem. Soc. A, 1971, 182 DOI: 10.1039/J19710000182
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