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Issue 37, 2012
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Aerobic oxidation of primary alcohols catalyzed by copper complexes of 1,10-phenanthroline-derived ligands

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Abstract

Five copper complexes [(L1)2Cu(H2O)](ClO4)2 (1), [(L1)Cu(H2O)3](ClO4)2 (1a), [(L3)2Cu(H2O)](ClO4)2 (2), [(L5)2Cu(H2O)](ClO4)2 (3) and [(L6)2Cu](ClO4) (4) (where L1 = 1,10-phenanthroline, L3 = 1,10-phenanthroline-5,6-dione, L5 = 1,10-phenanthrolinefuroxan and L6 = 2,9-dimethyl-1,10-phenanthrolinefuroxan), and in situ prepared copper complexes of 2,9-dimethyl-1,10-phenanthroline (L2) or 2,9-dimethyl-1,10-phenanthrolinedione (L4) were used for aerial oxidation of primary alcohols to the corresponding aldehydes under ambient conditions. The copper catalysts have been found to catalyze a series of primary alcohols including one secondary alcohol with moderate turnover numbers and selectivity towards primary alcohols. Copper(II) complexes 1 (or 1a) and 2 were found to be the better catalysts among all other systems explored in this study. A copper(II)-superoxo species is implicated to initiate the oxidation reaction. Structural and electronic factors of 1,10-phenanthroline-based ligands affecting the catalytic results for aerial oxidation of alcohols are discussed.

Graphical abstract: Aerobic oxidation of primary alcohols catalyzed by copper complexes of 1,10-phenanthroline-derived ligands

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Publication details

The article was received on 25 May 2012, accepted on 31 Jul 2012 and first published on 03 Aug 2012


Article type: Paper
DOI: 10.1039/C2DT31134H
Citation: Dalton Trans., 2012,41, 11476-11481
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    Aerobic oxidation of primary alcohols catalyzed by copper complexes of 1,10-phenanthroline-derived ligands

    O. Das and T. K. Paine, Dalton Trans., 2012, 41, 11476
    DOI: 10.1039/C2DT31134H

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