Hj. Reich et al., LITHIUM METALLOID EXCHANGE - REACTIVITY STUDIES OF AN ALLENYLLITHIUM REAGENT USING AN ISOMERIC PAIR OF ALLENYL AND PROP-2-YNYL STANNANES, Journal of the Chemical Society, Chemical Communications, (19), 1993, pp. 1481-1483
The regioselectivity and reactivity of silylation of an allenyl-prop-2
-ynyllithium reagent is different when a sequential or in situ Li/Sn e
xchange is used to prepare it; the evidence points to a solvent-separa
ted ion pair as the transient species trapped during the in situ exper
iment.