Synthesis, Characterization, and Crystal Structures of Three cis/trans Pyridine–Cyclopalladated Ferrocenylimine Complexes, and Their Catalysis in Suzuki Reactions

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Contents Vol 60(3)

doi:10.1071/CH07014

Synthesis, Characterization, and Crystal Structures of Three cis/trans Pyridine–Cyclopalladated Ferrocenylimine Complexes, and Their Catalysis in Suzuki Reactions

Chen Xu ^A, Jun-Fang Gong ^A ^B, Yan-Hui Zhang ^A, Yu Zhu ^A, Yang-Jie Wu ^A ^B

^A Department of Chemistry, Henan Key Laboratory of Chemical Biology and Organic Chemistry, Key Laboratory of Applied Chemistry of Henan Universities, Zhengzhou University, Zhengzhou 450052, China.
^B Corresponding authors. Email: wyj@zzu.edu.cn; gongjf@zzu.edu.cn





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Australian Journal of Chemistry 60(3) 190–195 http://dx.doi.org/10.1071/CH07014
Submitted: 19 January 2007 Accepted: 22 February 2007 Published online: 2 April 2007

Abstract

Three new pyridine–cyclopalladated ferrocenylimine complexes 2a–c have been easily prepared and characterized by elemental analysis, ESI-MS, ¹H NMR, and IR spectra. Their detailed structures are determined by single-crystal X-ray analysis. Palladacycle 2a is found to be a cis complex in the solid state, while 2b and 2c are trans complexes. These complexes were found to be efficient for the Suzuki reaction of aryl bromides with phenylboronic acid. Typically, using 0.2 mol% of 2c in the presence of 1.5 equivalents of K₂CO₃ as base in toluene at 100°C provided the coupled products in good to excellent yields.