Synthesis, characterization, and reactivity of ruthenium(II) complexes containing ? 6-arene-? 1-pyrazole ligands

New ruthenium(II) complexes containing ? 6-arene- ? 1-pyrazole ligands were synthesized and characterized by elemental analysis and spectroscopic methods. In addition, the molecular structure of dichloro-3,5-dimethyl-1-(pentamethylbenzyl)-pyrazole-ruthenium(II), [Ru]L 3b, was determined by X-ray diffraction studies. These complexes were applied in the transfer hydrogenation of acetophenone by isopropanol in the presence of potassium hydroxide. The activities of the catalysts were monitored by NMR. © 2012 Elsevier Ltd.Ege Üniversitesi: 2011-FEN-091, 2010-FEN-046Financial support from Ege University (Project 2010-FEN-046 ; 2011-FEN-091 ) and The Turkish Academy of Sciences (TUBA) is gratefully acknowledged. The authors are grateful to Anadolu University and the Medicinal Plants and Medicine Research Centre of Anadolu University, Eskişehir, Turkey, for the use of X-ray Diffractometer. -