Reductive carbonylation of nitrobenzene to phenylurethane catalyzed by Ru(III)-schiff base complexes |
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| Institution: | 1. Department of Chemistry, DAV College, Sector 10, Chandigarh 160 011, India;2. Department of Chemistry, Panjab University, Chandigarh 160 014, India;1. Centre for Advanced Studies in Chemistry, North-Eastern Hill University, Shillong 793022, India;2. Department of Chemistry, Pondicherry University, Puducherry 605014, India;3. Department of Chemistry, University of Washington, Seattle, WA 98195, USA;1. Chemistry Department, College of Science, Taibah University, P.O. Box 344, Madinah, Saudi Arabia;2. Department of Chemistry, Faculty of Science, Sohag University, Sohag 82534, Egypt;3. Department of Chemistry, College of Science, King Saud University, Riyadh 11451, Saudi Arabia;4. Department of Chemistry, College of Science, Imam Mohammad Ibn Saud Islamic University (IMSIU), Riyadh 11623, Saudi Arabia;5. Department of Biochemistry, Animal Health Research Institute, Sohag Branch, Agriculture Research Center, Egypt |
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| Abstract: | Ruthenium complexes containing Schiff bases with N2O2, N4 and N5 donor groups with the general formula RuIII(X)Cl1 or 2], where X = Schiff base such as bis(salicylaldehyde)-o-phenylenediimine (saloph), bis(salicylaldehyde)ethylenediimine (salen), bis(picolaldehyde)ethylenediimine (picen), bis(picolaldehyde)-o-phenylenediimine (pic-opd), bis(picolaldehyde)diethylenetriimine (pic-dien), were tested for their catalytic activity towards the reductive carbonylation of nitrobenzene in ethanol to give phenylurethane. The five Ru(III) complexes tested towards reductive carbonylation showed different catalytic activities in the range 160 – 200 °C and CO partial pressure of 15 atm.Among the complexes tested, Ru(saloph)Cl2] showed the highest catalytic activity with a turnover rate greater than 80 mol product per mol catalyst per hour at 160 °C and 15 atm CO. Ru(pic-en)Cl2]Cl and Ru(picopd)Cl2]Cl complexes with N4 donor systems were found to be less active towards carbonylation of nitrobenzene, as indicated by their turnover rates of 20 and 15 mol product per mol catalyst per hour, respectively, at 200 °C and 15 atm CO. The complex Ru(pic-dien)Cl]Cl2N5 donor system was completely inactive even at 200 °C and 15 atm CO, and no conversion of nitrobenzene was seen even after 12 h contact time. |
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