The regioselectivity and reactivity of silylation of an allenyl–prop-2-ynyllithium reagent is different when a squential or in situ Li/Sn exchange is used to prepare it; the evidence points to a solvent-separated ion pair as the transient species trappe during the in situ expriment.
H. J. Reich, J. D. Mason and J. E. Holladay, J. Chem. Soc., Chem. Commun., 1993, 1481 DOI: 10.1039/C39930001481
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