NDLI: Oxidation of secondary alcohols by conventional and microwave-assisted methods using molybdenum complexes of ONO donor ligands

Content Provider	Royal Society of Chemistry (RSC)
Author	Dhaka, Sarita Avecilla, Fernando Maurya, Mannar R.
Copyright Year	2015
Abstract	New dioxidomolybdenum(VI) complexes, [MoVIO2{Hdfmp(bhz)2}(MeOH)] 1, [MoVIO2{Hdfmp(inh)2}(MeOH)] 2 and [MoVIO2{Hdfmp(nah)2}(MeOH)] 3 of ligand H3dfmp(L)2I, are obtained by the condensation of 2,6-diformyl-4-methylphenol (dfmp) and hydrazides (L) [L = benzoylhydrazide (bhz), isonicotinoylhydrazide (inh), and nicotinoylhydrazide (nah)], respectively. All these complexes are characterized in the solid state and in solution namely by elemental analyses, spectroscopic techniques (IR, electronic, 1H and 13C NMR) and thermogravimetric analyses. Single crystal X-ray analysis of complexes 1 and 3 confirms the coordination of the ligand in the dianionic (ONO2−) enolate–tautomeric form and one of the hydrazido moieties remains non-coordinated. Oxidation of secondary alcohols: 1-phenyl ethanol, 2-propanol and 2-butanol, catalyzed by these molybdenum complexes, using conventional liquid phase and microwave-assisted methods in the presence of 30% H2O2 as an oxidant has been tested. The effects of various factors, such as temperature and amounts of catalyst, H2O2 and solvent have been investigated. These alcohols under the optimized reaction conditions gave high yields of the respective ketone. Addition of an N-based additive reduces the reaction time considerably. Amongst the two methods studied, the microwave technique proves to be a time efficient system.
Starting Page	2130
Ending Page	2139
Page Count	10
File Format	HTM / HTML PDF
ISSN	11440546
Volume Number	39
Issue Number	3
Journal	New Journal of Chemistry
DOI	10.1039/c4nj02208d
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Hydrogen peroxide Ligand Hdfmp Nuclear magnetic resonance spectroscopy Alcohol Phenyl group Molybdenum Ketone Single crystal X-ray crystallography Isopropyl alcohol P-Cresol Elemental analysis Butanol Isoniazid Solvent
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry Catalysis

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