Copper-2,2′-bipyridines: Catalytic performance and structures in aqueous alkaline solutions

Korpi, Heikki; Sippola, Väinö; Filpponen, Ilari; Sipilä, Jussi; Krause, Outi; Leskelä, Markku; Repo, Timo

doi:10.1016/j.apcata.2006.01.020

Cited by 27 publications

(23 citation statements)

References 18 publications

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“…As previously reported, the efficient oxidation reaction catalyzed by Cu(II) diimine complexes requires highly alkaline reaction conditions (NaOH, pH > 12.6). [13,19] In the case of 1-5, both NaOH and K 2 CO 3 have an equally beneficial influence on the catalytic activity. This is one of the marked differences to the previous Cu(II) diimine catalysts.…”

Section: Catalytic Oxidationmentioning

confidence: 99%

Aerobic Oxidation of Benzylic Alcohols in Water by 2,2,6,6‐Tetramethylpiperidine‐1‐oxyl (TEMPO)/Copper(II) 2‐N‐Arylpyrrolecarbaldimino Complexes

et al. 2009

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Section: Catalytic Oxidationmentioning

confidence: 99%

Aerobic Oxidation of Benzylic Alcohols in Water by 2,2,6,6‐Tetramethylpiperidine‐1‐oxyl (TEMPO)/Copper(II) 2‐N‐Arylpyrrolecarbaldimino Complexes

et al. 2009

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“…Vanadium-oxo complexes have also been demonstrated as efficient catalysts for C-O bond cleavage in lignin model compounds [74]. Silk et al showed that the choice of vanadium complex strongly influenced selectivity, directing either the cleavage of C-C bonds between an aryl ring and the contiguous group, or C-O linkages scission [75]. Polyoxometalates are robust redox catalysts, and effective for oxidative degradation; when performed in the presence of molecular oxygen, a two-step process occurs, in which the polyoxoanion is first reduced and, subsequently, reoxidised without any net structural change [76].…”

Section: Oxidative Transformationsmentioning

confidence: 99%

“…Copper complexes, such as Cu-bipy and Cu-phen, can also catalyse the oxidative transformation of lignin model compounds, such as veratryl alcohol and 2,2-biphenol. Oxidation activity was a function the of steric and electronic ligand effects [75]. Hydrogen peroxide is widely used in organic transformations and, generally, considered as a green oxidant with water as the sole byproduct [80].…”

Section: Oxidative Transformationsmentioning

confidence: 99%

Heterogeneously catalyzed lignin depolymerization

Pineda

Lee

2016

Appl Petrochem Res

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Biomass offers a unique resource for the sustainable production of bio-derived chemical and fuels as drop-in replacements for the current fossil fuel products. Lignin represents a major component of lignocellulosic biomass, but is particularly recalcitrant for valorization by existing chemical technologies due to its complex crosslinking polymeric network. Here, we highlight a range of catalytic approaches to lignin depolymerisation for the production of aromatic bio-oil and monomeric oxygenates.

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“…These are mild conditions compared with the experimental setup of other authors [30,31], where high temperatures and pressures are needed to reach similar yields with different catalysts. Moreover, most of the oxygen-activating homogeneous transition-metal catalysts are investigated in organic solvents [32,33]; however, only a few are known to be active in water [34].…”

Section: A T a L Y S T Smentioning

confidence: 99%

Biomimetic Catalysts for Oxidation of Veratryl Alcohol, a Lignin Model Compound

et al. 2013

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Abstract:Kraft pulp has to be bleached to eliminate the chromophoric structures, which cause a darkening of the pulp. In Nature, an equivalent role is assumed by ligninolytic enzymes such as lignin peroxidases, manganese peroxidases and laccases. The development of low molecular weight manganese peroxidase mimics may achieve environmentally-safe bleaching catalysts for the industry. Herein we report the synthesis and characterization of six manganese(III) complexes 1-6, incorporating dianionic hexadentate Schiff base ligands (H 2 L 1 -H 2 L 4 ) and different anions. Complex 4, Mn 2 L 2 2 (H 2 O) 2 (DCA) 2 was crystallographically characterized. Complexes 1-4 behave as more efficient mimics of peroxidase in contrast to 5-6. We have studied the use of these complexes as catalysts for the degradation of the lignin model compound veratryl alcohol. The biomimetic catalysts were used in conjunction with chlorine-free inexpensive co-oxidants as dioxygen or hydrogen peroxide. Yields up to 30% of veratryl alcohol conversion to veratraldehyde have been achieved at room temperature in presence of air flow using 0.5% of catalyst.

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Copper-2,2′-bipyridines: Catalytic performance and structures in aqueous alkaline solutions

Cited by 27 publications

References 18 publications

Aerobic Oxidation of Benzylic Alcohols in Water by 2,2,6,6‐Tetramethylpiperidine‐1‐oxyl (TEMPO)/Copper(II) 2‐N‐Arylpyrrolecarbaldimino Complexes

Aerobic Oxidation of Benzylic Alcohols in Water by 2,2,6,6‐Tetramethylpiperidine‐1‐oxyl (TEMPO)/Copper(II) 2‐N‐Arylpyrrolecarbaldimino Complexes

Heterogeneously catalyzed lignin depolymerization

Biomimetic Catalysts for Oxidation of Veratryl Alcohol, a Lignin Model Compound

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