Efficient and affordable palladium precatalysts for Suzuki couplings: prospects for the industry Hammed O. Oloyede 1,2* , Joseph A. O. Woods 2 , Winfried Plass 3 , Abiodun. O. Eseola, 3,4 1 Department of Chemistry, Adeyemi Federal University of Education, Nigeria, 2 Inorganic Chemistry Unit, Department of Chemistry, University of Ibadan, Nigeria, 3 Institute for Inorganic and Analytical Chemistry, Friedrich-Schiller University-Jena, Germany, 4 Material Science group, Department of Chemical Sciences, Redeemer’s University, Nigeria Synthesis of new micro/macro organic molecules through palladium-catalyzed carbon-carbon couplings for real world applications has become inevitable in molecular sciences. However, the complexity and high cost of commercially available precatalysts has basically hindered their accessibility. In this report, some simple phosphine-free ligands of o -sulfonamide azo-benzene ligands, La – Lc were prepared and characterized. Room temperature reaction between the ligands and palladium(II) acetate in suitable solvents afforded the preformed complexes. The ligands and the preformed complexes were characterized by spectroscopic methods and single crystal X-ray measurement. The preformed complexes were examined as catalysts for carbon–carbon Suzuki couplings. Coupling catalysis results showed high catalytic performances for the complexes with yields greater than 90% within 5 minutes in green solvent (water). Correlation between ligand bulkiness and catalytic efficiencies of the complexes were observed. The result is significant because the catalysts are simple, stable and cost effective and therefore could serve as active catalysts for carbon–carbon couplings in the catalytic industry. References 1. H. Li, C.C. Johansson Seechurn, T.J. Colacot. 2012 . A CS Catal . 2, 1147–1164. 2. D. Sasidharan, C.V. Aji, P. Mathew. 2019 . Polyhedron 157, 335–34 3. X. Zhou, X. Guo, F. Jian, G. Wei. 2018 . ACS Sust. Chem. Eng . 3, 4418–4422 4. S. Shi, S.P. Nolan, M. Szostak. 2018 . Chem. Res. 51, 2589–2599 5. H.O. Oloyede, J.A.O. Woods, H. Görls, W. Plass, A.O. Eseola. 2019 . Polyhedron , 159, 182 - 91 6. E. Ocansey, J. Darkwa, B.C.E. Makhubela. 2018 . RSC Adv . 8, 13826–13834.
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