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Highly active Pd(II) catalysts with trans-bidentate pyridine ligands for the Heck reaction
Tomikazu Kawano1, Tatsuji Shinomaru, Ikuo Ueda
1The Institute of Scientific and Industrial Research, Osaka University, Mihogaoka, Ibaraki, Osaka 567-0047, Japan. kawano@sanken.osaka-u.ac.jp
Organic Letters
|July 19, 2002
Abstract:
[reaction: see text] The air-, water-, and heat-stable palladium(II) complexes 2a and 2b are prepared by the reaction of palladium(II) salts with the new trans-bidentate nitrogen ligands, 1,2-bis(2-pyridylethynyl)benzenes. The structure of complex 2a has been confirmed by X-ray structure analysis. The complexes efficiently catalyze the Heck olefination of aryl iodides and provide a good yield under phosphine-free conditions. The reaction is very sensitive to the nature of the chelating ligand.