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Ruthenium Catalyzed Dehydrogenation of Alcohols and Mechanistic Study
journal contribution
posted on 2019-10-18, 14:34 authored by Mahendra
K. Awasthi, Sanjay K. SinghWe
synthesized pyridylamine ligated arene-Ru(II) complexes and
employed these complexes for the catalytic acceptorless dehydrogenation
of primary alcohols to carboxylic acids. All the synthesized complexes [Ru]-1–[Ru]-10 are characterized using
several spectro-analytical techniques, and the structures of complexes [Ru]-1, [Ru]-2, and [Ru]-5 are determined
using single crystal X-ray crystallography. Efficient catalytic conversion
of primary alcohols to potassium carboxylates or carboxylic acids
is achieved in toluene with the quantitative release of hydrogen gas.
The studied protocol for carboxylic acid synthesis with hydrogen generation
is also employed for a wide range of substrates, including aliphatic
alcohols, aromatic alcohols, and heteroaromatic alcohols, to obtain
respective carboxylic acids in good yields (up to 86%). The studied
arene-Ru catalysts also exhibit superior catalytic activity for the
bulk reaction to achieve a turnover number of 1378. Moreover, extensive
mass investigations are also performed to elucidate the mechanistic
pathway by identifying the crucial catalytic intermediates, including
aldehyde and diol coordinated Ru species under the catalytic and controlled
reaction conditions.