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Half‐sandwich Ru (II) complexes containing (N, O) Schiff base ligands: Catalysts for base‐free transfer hydrogenation of ketones
Author(s) -
Satheesh C.E.,
Sathish Kumar Pushpanathan N.,
Kumara P. Raghavendra,
Karvembu Ramasamy,
Hosamani Amar,
Nethaji M.
Publication year - 2019
Publication title -
applied organometallic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 71
eISSN - 1099-0739
pISSN - 0268-2605
DOI - 10.1002/aoc.5111
Subject(s) - chemistry , transfer hydrogenation , schiff base , catalysis , denticity , monobasic acid , yield (engineering) , base (topology) , medicinal chemistry , crystal structure , polymer chemistry , crystallography , ruthenium , organic chemistry , mathematical analysis , materials science , mathematics , metallurgy
Two new half‐sandwich Ru (II)( p ‐cymene) complexes ( 1 and 2 ) containing dopamine‐based (N, O) Schiff base ligands ( L 1 H and L 2 H ) were synthesized and characterized by FT‐IR, UV–Visible and 1 H & 13 C NMR spectral techniques, and elemental analyses. The spectroscopic and analytical data revealed monobasic bidentate coordination of the ligands with Ru ion. The molecular structures of L 1 H , L 2 H and 2 were further confirmed by single crystal X‐ray diffraction study. Complexes 1 and 2 have been employed as catalysts in the transfer hydrogenation of ketones using 2‐propanol as a hydrogen source at 85 °C under base‐free condition. Good to the excellent yield of secondary alcohols, gram scale synthesis, and high TON and TOF made this catalytic system interesting.