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Transfer Hydrogenation of Aryl Ketones with Half‐Sandwich Ru II Complexes That Contain Chelating Diamines
Author(s) -
Türkmen Hayati,
Kani İbrahim,
Çetinkaya Bekir
Publication year - 2012
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201200638
Subject(s) - chemistry , acetophenone , transfer hydrogenation , cationic polymerization , chelation , catalysis , pyridine , diamine , dimer , amine gas treating , amide , medicinal chemistry , ruthenium , bipyridine , polymer chemistry , stereochemistry , organic chemistry , crystal structure
In a comparative study, half‐sandwich complexes of Ru II ( 1 ) with pyridine‐based chelating diamine [NN = 2‐aminomethylpiperidine (ampi), a ; 2‐aminomethylpyridine (ampy), b ; 8‐aminoquaniline (aquan), c ; 4,4′‐dimethyl‐2,2′‐bipyridine (dbipy), d ; 2,2′‐bipyridine (bipy), e ] or amine amide (Ts‐ampi, 2a ) were synthesized by cleavage of [{(η 6 ‐ p ‐cymene)Ru(μ‐Cl)Cl} 2 ] dimer and the resulting complexes were screened for their efficiency in the transfer hydrogenation (TH) of acetophenone in 2‐propanol (IPA) at 82 °C or in water in HCOONa. Among the complexes, cationic 1a , neutral 2a , and 1b , which bear ampi and ampy, were the most effective in terms of catalyst performance (turnover frequency values: 198, 6000, 23 h –1 , respectively).