Abstract Alkylphenylacetylenes, C 6 H 5 C CCH 2 R, have been metallated at the propargylic positions with an excess of n-butyllithium in diethyl ether at 0 C. Mono-and di- silyl derivatives have been isolated by quenching the metallation mixtures with Me 3 SiCl at different times. Pseudo-first order rate constants have been calculated for the monometallation from the rate of formation of the silylated products. A Taft correlation ...
