Journal
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
Volume 116, Issue -, Pages 501-508Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.saa.2013.07.114
Keywords
Quinoline based ligand; Ruthenium(II) carbonyl complexes; Aldehydes to amides conversion; o-Allylation of phenols
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Six new octahedral ruthenium(II) carbonyl complexes having the general molecular formula [RuCl(-CO)(B)L1-2] (B = PPh3, AsPh3 or py; L1-2 = quinoline based NNO ligand) were synthesized. The quinoline based ligands behave as monoanionic tridentate donor and coordinated to ruthenium via ketoenolate oxygen, azomethine nitrogen and quinoline nitrogen. The composition of the complexes has been established by elemental analysis and spectral methods (FT-IR, electronic, H-1 NMR, C-13 NMR, P-31 NMR and ESI-Mass). The complexes were used as efficient catalysts for one-pot conversion of various aldehydes to their corresponding primary amides in presence of NH2OH center dot HCl and NaHCO3. The effect of catalyst loading and reaction temperature on catalytic activity of the ruthenium(II) carbonyl complexes were also investigated. The synthesized complexes also possess good catalytic activity for the o-allylation of phenols in the presence of K2CO3 under mild conditions. The complexes afforded branched allyl aryl ethers according to a regioselective reaction. (C) 2013 Elsevier B.V. All rights reserved.
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