Abstract

The activation studies for catalytic reduction of nitrobenzene to aniline by iridium(I) complexes, [Ir(COD)(amine) 2]PF 6 (COD = 1,5-cyclooctadiene, amine = 4-picoline, 3-picoline, 2-picoline, or pyridine) heterogenized on poly(4-vinylpyridine) in aqueous 2-ethoxyethanol are described. The aniline formation (mmol, based on CO 2 formed after 9 h) followed the order: 4-picoline (0.068) > 2-picoline (0.052) > 3-picoline (0.046) ? pyridine (0.042) for 1.0×10 -4 mol Ir/0.5 g of polymer, 0.26 mL of nitrobenzene, 10 mL of 2-ethoxyethanol/water, 8/2, v/v, P(CO) = 0.9 atm, at 100°C. © Akadémiai Kiadó, All rights reserved.