Abstract
AbstractIn a comparative study, half‐sandwich complexes of RuII (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 [{(η6‐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).
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