A palladium-catalyzed 1,4-enyne synthesis was developed based the decarboxylative coupling of acetylides with allyl electrophiles. Stereochemical studies have implicated palladium-allyl-acetylides as intermediates. Thus, decarboxylative metalation was established as an environmentally benign alternative to transmetalation from alkynyl tin reagents.
REVESZ, LASZLO;MEIGEL, HARALD, HELV. CHIM. ACTA, 71,(1988) N 7, C. 1697-1703