Palladium‐Catalyzed Alkynylcarbonylation of Aryl Iodides with the Use of Mo(CO)₆ in the Presence of tBu₃P Ligand

Palladium‐catalyzed alkynylcarbonylation of aryl iodides was accomplished by using Mo(CO) 6 as a CO source. The reaction was conducted at room temperature with the use of t Bu 3 P as a ligand, which was found to be essential for smooth carbonylation. One‐pot construction of pyrazoles by using aryl iodides with electron‐withdrawing groups was also accomplished under these reaction conditions in the presence of methylhydrazine. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)