Ruthenium-catalyzed transfer hydrogenation of aromatic ketones with aminophosphine or bis(phosphino)amine ligands derived from isopropyl substituted anilines

New iminophosphine–Ru(II) complexes and their application in hydrogenation and transfer hydrogenation

“…The highest conversion of 99% occurs for the transfer hydrogenation of o ‐methoxyacetophenone conducted using the catalyst 2a . As for ketones with an electron‐donating group such as methoxy and methyl, substitution at the para position tends to give lower conversions than the ortho position (Table , entry 1) . The conversion of acetophenones containing an electron‐withdrawing group is higher than that of methoxyacetophenones.…”

trans- and cis-Ru(II) aminophosphine complexes: Syntheses, X-ray structures and catalytic activity in transfer hydrogenation of acetophenone derivatives

“…The IR spectra were recorded on a Mattson 1000 ATI UNICAM FT-IR spectrometer as KBr pellets. 1 H (400.1 MHz), 13 C NMR (100.6 MHz) and 31 To a solution of [Ru(g 6 -p-cymene)(l-Cl)Cl] 2 (149 mg, 0.243 mmol) in 10 mL thf, a solution (thf, 30 mL) of (PPh 2 ) 2 -NCH 2 -C 4 H 3 S, 1 (469 mg, 0.972 mmol) was added. The resulting reaction mixture was allowed to proceed under stirring at room temperature for 1 h. After this time, the solution was filtered off and the solvent evaporated under vacuum, the solid residue thus obtained was washed with diethyl ether (3 Â 15 mL) and then dried under vacuum (Scheme 1).…”

“…The structures of both complexes were determined by single crystal X-ray diffraction analyses. As a part of our continuing interest in developing highly active efficient and stable catalysts [30][31][32][33], we report here the catalytic activity of trans-[Ru((PPh 2 ) 2 NCH 2 -C 4 H 3 S) 2 Cl 2 ], 2 complex in the transfer hydrogenation of acetophenone derivatives.…”

Organometallic ruthenium, rhodium and iridium complexes containing a P-bound thiophene-2-(N-diphenylphosphino)methylamine ligand: Synthesis, molecular structure and catalytic activity

“…Hence, these kinds of ligands are attractive and also widely used in ruthenium, rhodium and iridium complexes for catalytic hydrogenations reactions [38,39]. Recently, we have reported that the novel half-sandwich complexes, based on the ligands with PeN and PeO backbone, are active catalysts in the reduction of aromatic ketones [40,41].…”