Abstract Arylmethylacetylenes, XC 6 H 4 C CCH 3, have been metallated with an excess of n-butyllithium in diethyl ether at 0 C. By quenching the metallation mixtures with trimethylchlorosilane at different times, mono-, di-and tri-silyl derivatives have been isolated. Pseudo-first order rate constants for the monometallation were calculated from the rate of formation of the silylated products. A Hammett plot gave ϱ= 1.3, indicating moderate ...
