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Issue 2, 2017
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Molybdenum complexes with a μ-O{MoO2}2 core: their synthesis, crystal structure and application as catalysts for the oxidation of bicyclic alcohols using N-based additives

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Abstract

Three binuclear μ-oxidobis{dioxidomolybdenum(VI)} complexes, [(μ-O){MoVIO2(MeOH)}2(L1)] 1, [(μ-O){MoVIO2(MeOH)}2(L2)] 2, and [(μ-O){MoVIO2(MeOH)}2(L3)] 3 with potential dibasic tetradentate azine ligands [H2L1 = azine of salicylaldehyde, H2L2 = azine of 3-methoxysalicyaldehyde and H2L3 = azine of 3,5-ditertiarybutylsalicylaldehyde] are reported. The complexes are characterized via elemental analysis, various spectroscopic techniques (FT-IR, UV-Vis, 1H and 13C NMR), thermogravimetric analysis and single-crystal X-ray diffraction (2 and 3) studies. These complexes are binuclear having a μ-O{MoO2}2 core where ligands coordinate through a set of phenolic oxygen and azine nitrogen to each molybdenum, thus behaving as bis(bidentate). These complexes are investigated as catalysts for the oxidation of two bicyclic alcohols (fenchyl alcohol and isoborneol) using 30% H2O2 as the oxidant in the presence of NEt3 as the additive. The conversion of bicyclic alcohols within the additives follows the order: NEt3 > py > NH3 > K2CO3 > KOH. In the presence of an N-based additive, fenchyl alcohol and isoborneol selectively give high yields of fenchone and camphor, respectively, while in the absence of the additive the conversion is relatively low.

Graphical abstract: Molybdenum complexes with a μ-O{MoO2}2 core: their synthesis, crystal structure and application as catalysts for the oxidation of bicyclic alcohols using N-based additives

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Supplementary files

Article information


Submitted
09 Oct 2016
Accepted
28 Nov 2016
First published
30 Nov 2016

New J. Chem., 2017,41, 724-734
Article type
Paper

Molybdenum complexes with a μ-O{MoO2}2 core: their synthesis, crystal structure and application as catalysts for the oxidation of bicyclic alcohols using N-based additives

M. R. Maurya, L. Rana and F. Avecilla, New J. Chem., 2017, 41, 724
DOI: 10.1039/C6NJ03162E

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