4.5 Article

α-Hydroxyimine palladium complexes: Synthesis, molecular structure, and their activities towards the Suzuki-Miyaura cross-coupling reaction

Journal

JOURNAL OF ORGANOMETALLIC CHEMISTRY
Volume 729, Issue -, Pages 95-102

Publisher

ELSEVIER SCIENCE SA
DOI: 10.1016/j.jorganchem.2013.01.018

Keywords

alpha-Hydroxyimine palladium complex; Suzuki-Miyaura reaction; Aryl bromide; Arylboronic acid

Funding

  1. National Natural Science Foundation of China [21004014]
  2. Foundation for Distinguished Young Talents in Higher Education of Guangdong, China [LYM10091]
  3. Key Laboratory of Designed Synthesis and Application of Polymer Material

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An activity-promoting strategy for phosphine-free catalytic systems is presented in this study. The strategy is based on a series of non-conjugated N,O ligands with bulky substituents, [Ar-N=C(R)-(R)C(CH3)OH] (L1, R = Acenaphthyl, Ar = 2,6-diisopropylphenyl; L2, R = Ph, Ar = 2,6-dimethylphenyl; L3, R = Ph, Ar = 2,6-diisopropylphenyl). The reaction of PdCl2 with 1 equiv of the ligand L1-3 in methanol affords the four-coordinate palladium complex with the general formula LPdCl2 (1-3). The molecular structures of L3, as well as the palladium complexes 1 and 3, were established by single-crystal X-ray diffraction studies. The application of these palladium complexes as precatalysts was examined for the Suzuki-Miyaura cross-coupling of a range of aryl bromides with arylboronic acids. 3, which incorporates bulky substituents, was shown to be effective in the cross-coupling reactions at 0.01 mol% palladium loading, affording the corresponding biaryls in high yields. (C) 2013 Elsevier B.V. All rights reserved.

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