Abstract
Three types of catalytic system based on palladium complexes were studied in the synthesis of alkynylcarboxylic acid esters by oxidative carbonylation of monosubstituted alkynes. Three mechanisms were proposed for activation of the ≡CH bond in alkynes and the formation of RC≡C[Pd]X, a key intermediate: (i) electrophilic substitution of H + by Cu(I), (ii) electrophilic substitution of H + by I +, and (iii) oxidative addition of the CH bond in alkynes to palladium.
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