An unusual regioselectivity in the Pd-catalyzed cross coupling of alkynes. A correction

Palladium catalyzed additions of terminal alkynes to alkynoates can lead from preferential to exclusive CC bond formation at the α-carbon and, in the case of ethyl 3-dimethylphenylsilylpropiolate, complete selectivity for α-attack, an unprecedented regioselectivity that requires revision of the earlier assignment of regioselectivity.