Oxoperoxo molybdenum(vi) and tungsten(vi) and oxodiperoxo molybdate(vi) and tungstate(vi) complexes with 8-quinolinol: synthesis, structure and catalytic activity

Maiti, Saumen; Banerjee, Surajit; Mukherjee, Alok K.; Malik, K. M. Abdul; Bhattacharyya, Ramgopal

doi:10.1039/b410984h

Cited by 67 publications

(34 citation statements)

References 34 publications

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“…To the best of our knowledge, the ability of 1-3 to catalyse the oxidation of alcohols in the presence of oxygen atom donors other than DMSO has not been reported. Nevertheless, there are several examples in the literature where oxomolybdenum(VI) complexes catalyse the oxidation of alcohols using oxidants such as hydrogen peroxide (H 2 O 2 ), molecular oxygen and tert-butyl hydroperoxide (TBHP) [19][20][21][22]. The first objective of the work described herein was therefore to compare DMSO, iodosobenzene (PhIO), H 2 O 2 and TBHP as oxidants in the oxidation of benzyl alcohol and cyclohexanol with 1-3 as catalyst precursors.…”

Section: Introductionmentioning

confidence: 99%

Effect of an Ionic Liquid on the Catalytic Performance of Thiocyanatodioxomolybdenum(VI) Complexes for the Oxidation of Cyclooctene and Benzyl Alcohol

et al. 2009

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The complexes (PPh 4 ) 2 [Mo VI O 2 (NCS) 4 ] (1), Mo VI O 2 (NCS) 2 (di-tBu-bipy) (2) and Mo 2 VI O 5 (NCS) 2 (di-t Bu-bipy) 2 (3) (di-tBu-bipy = 4,4 0 -di-tert-butyl-2,2 0 -bipyridine) were studied as catalyst precursors for the oxidation of cyclooctene (Cy8) and benzyl alcohol (BzOH), using either dimethyl sulfoxide (DMSO) or tert-butyl hydroperoxide (TBHP) as oxidant. By dissolving complex 2 in the room temperature ionic liquid 1-butyl-3-methylpyridinium tetrafluoroborate, the catalytic performance with TBHP was improved (higher selectivity to the aldehyde and higher Cy8 conversions). For Cy8 oxidation, the unreacted substrate and products were easily extracted with n-hexane, and the ionic phase containing the catalyst could be reused without loss of catalytic performance.

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Section: Introductionmentioning

confidence: 99%

Effect of an Ionic Liquid on the Catalytic Performance of Thiocyanatodioxomolybdenum(VI) Complexes for the Oxidation of Cyclooctene and Benzyl Alcohol

et al. 2009

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“…1,3,[10][11][12][13][14][15] It has been appreciated for at least 140 years that characteristic colour reactions may occur when hydrogen peroxide is added to solutions of transition metal derivatives. 16 Among the various d o transition metal peroxo systems, V(V), Mo(VI) and W(VI), which have clear structural and isoelectronic relationships, attract continuous research attention because of their versatility and selectivity as stoichiometric or catalytic oxidizing or oxo-transfer agent in a variety of organic oxidations such as epoxidation of alkenes, [17][18][19][20] oxidation of sulfides and sulfoxides, [21][22][23][24][25][26] primary and secondary alcohols, 27,28 as well as halide oxidation. [29][30][31][32] Besides these, the active involvement or relevance of these peroxometallates in haloperoxidase, 29,31,32 their insulino-mimetic, [33][34][35][36] anti-neoplastic 37 and enzyme inhibitory activity 38,39 have been well documented.…”

Section: Introductionmentioning

confidence: 99%

Macromolecular peroxo complexes of Vanadium(V) and Molybdenum(VI): Catalytic activities and biochemical relevance

Islam

Boruah

2015

J Chem Sci

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Our recent achievements concerning the synthesis and characterization of water soluble peroxo complexes of V(V) and Mo(VI) in macroligand environment, as well as some key features of biological relevance of these compounds, such as their hydrolytic stability, activity with phosphohydrolase enzyme vis-à-vis free peroxovanadium (pV) or peroxomolybdenum (pMo) complexes, and their activity in biomimetic oxidative bromination are presented here. Immobilization of pMo species on insoluble polymer matrices viz., amino acid functionalized Merrifield resins and poly(acrylonitrile) on the other hand, afforded a set of heterogeneous catalysts highly effective in facile organic transformations such as selective oxidation of organic sulfides and oxidative bromination of aromatic substrates by H 2 O 2 , at ambient temperature. The methodologies are straightforward, high-yielding, halogen-free and the catalysts afford easy regeneration. Our findings illustrate the various features which make the procedures sustainable and synthetically useful.

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“…The key aspect of the reaction is the formation of the oxidant peroxymonocarbonate ion, HCO 4 -by hydrogen peroxide and bicarbonate. This oxidant peroxymonocarbonate ion, HCO 4 -acts as a potent oxidant in aqueous solution with an electrode potential in close proximity to that of H 2 O 2 , hence a more reactive nucleophile than H 2 O 2 results in an acceleration in the epoxidation reaction [31]. It is understood that using a twin catalyst system such as H 2 O 2 ?…”

Section: Catalytic Testsmentioning

confidence: 99%

Two hydrogen-bond-cross-linked molybdenum (VI) network polymers: synthesis, crystal structures and cyclooctene epoxidation with H2O2

Wang

Shi

et al. 2009

Struct Chem

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Two molybdenum (VI) hydrogen-bonded network polymers [MoO 2 F 4 ]Á(4,4 0 -H 2 bpd)(H 2 O) 2 (1) and [MoO 2 Cl 3 (H 2 O)]Á(4,4 0 -H 2 bpd)Cl (2) (bpd = bipiperidine) have been synthesized and examined as catalysts for epoxidation of cyclooctene. Complexes of the Mo compounds containing the bpd ligand are prepared and characterized by infrared spectroscopy, thermogravimetric and elemental analyses. They have been structurally characterized by single crystal X-ray diffraction analysis. The structures of both the complexes are shown to be comprised of molybdenum and two protonated N-ligand cations that have resulted in a crosslinked hydrogen-bonded network structure. These complexes are applicable as catalysts for the cis-cyclooctene epoxidation reactions with hydrogen peroxide as a source of oxygen and NaHCO 3 as a cocatalyst. It has been observed that the formation of the oxidant peroxymonocarbonate ion, HCO 4 -by hydrogen peroxide and bicarbonate enhances the epoxidation reaction. Both the complexes have exhibited a good activity and a very high selectivity for the formation of cyclooctene oxide.

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Oxoperoxo molybdenum(vi) and tungsten(vi) and oxodiperoxo molybdate(vi) and tungstate(vi) complexes with 8-quinolinol: synthesis, structure and catalytic activity

Cited by 67 publications

References 34 publications

Effect of an Ionic Liquid on the Catalytic Performance of Thiocyanatodioxomolybdenum(VI) Complexes for the Oxidation of Cyclooctene and Benzyl Alcohol

Effect of an Ionic Liquid on the Catalytic Performance of Thiocyanatodioxomolybdenum(VI) Complexes for the Oxidation of Cyclooctene and Benzyl Alcohol

Macromolecular peroxo complexes of Vanadium(V) and Molybdenum(VI): Catalytic activities and biochemical relevance

Two hydrogen-bond-cross-linked molybdenum (VI) network polymers: synthesis, crystal structures and cyclooctene epoxidation with H2O2

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