Journal
JOURNAL OF COORDINATION CHEMISTRY
Volume 69, Issue 5, Pages 763-778Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/00958972.2016.1151876
Keywords
Amine palladacycle; phosphorus ylide; Suzuki reaction; catalysis
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Funding
- Isfahan University of Technology (IUT)
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Six secondary amine palladacycles bearing monodentate ligands (1a, 2a), 1,2-bis(diphenylphosphino) ethane (dppe) and 1,3-bis(diphenylphosphino) propane (dppp) containing bridging and bidentate ligands (1b, 2b-d), and four C, C-type phosphorus ylide complexes containing thiourea (tu) (3a), phenyl isothiocyanate (4a), and bridging and terminal azide groups (5 and 5a) have been synthesized. Resulting complexes have been characterized by elemental analyses, IR, H-1-, C-13{1H}-, and P-31{H-1}-NMR spectroscopy with single crystal X-ray structure determination of 1a and 2a. The Pd in 1a and 2a occupies the center of a slightly distorted square planar environment formed by C-aryl, N-amine, N-pyridine, and Cl. The catalytic efficiency of complexes showed that in most cases, amine palladacycles display better catalytic activities than the phosphorus ylide Pd(II) complexes. Comparison between bidentate and bridging dppe complexes showed that dppe-bridged dimer 2d has higher catalytic activity than dppe bidentate complex. [GRAPHICS] .
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