“…[1] Such reactions include: i) cycloisomerization of enynes, [1,2] ii) hydrocarbonylation and hydrocarboxylation of alkynes, [3] iii) isomerization of alkynes to 1,3-dienes, [1][2a] iv) hydrocarbonylation of aryl halides. [4] In all these reactions, the catalytic cycle is considered to be induced by a hydridopalladium complex formed by reaction of the palladium(0) complex and the acidic derivative. [1,5] This hydridopalladium complex undergoes syn addition to an alkyne (hydropalladation) which generates a vinylpalladium(II) complex, a key intermediate for further reactions.…”