Abstract
AbstractCarbon dioxide was found as a selective agent to promote the palladium‐catalyzed cyclotrimerization of alkynes in water. Both aryl and alkylacetylenes afforded the corresponding cyclotrimerization products regioselectively in high yields using PdCl2, CuCl2, and CO2 as the catalytic system. However, tert‐butylacetylene bearing a bulky group gave a dimerization product. Mechanism of this reaction was also discussed.
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