Journal
JOURNAL OF COORDINATION CHEMISTRY
Volume 68, Issue 3, Pages 432-448Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/00958972.2014.995100
Keywords
Bis(oxazoline); Palladium; Crystal structure; Suzuki-Miyaura; Mizoroki-Heck; Sonogashira
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Funding
- King Abdulaziz City for Science and Technology (KACST) through the Science & Technology Unit at King Fahd University of Petroleum & Minerals (KFUPM) [11-PET1665-04]
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New bis(oxazoline) ligands and their palladium complexes were synthesized and characterized. X-ray crystal structures of the two new complexes showed distorted square planar geometry with the palladium ion bonded to nitrogens of two bidentate heterocycles in addition to two bromides and two acetate ions for Pd-BOX-1 and Pd-BOX-2, respectively. The complexes adopt a chair structure with a rigid curvature inducing an inherent chirality. The complexes were effective catalysts for Suzuki-Miyaura, Mizoroki-Heck, and copper-free Sonogashira coupling reactions in aqueous dimethylformamide and under aerobic conditions. The reaction conditions were optimized for best solvent, base, and temperature. The substrate scope of the new catalytic system was evaluated for coupling reactions of a variety of aryl halides with aryl boronic acids, alkenes, and alkynes.
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