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Two bis-tridentate chelated cobalt ii complexes, which differ in the ligand
structure by a methylene group, activate molecular oxygen O 2 , and give
different oxidation products. The reversibility of the amine to imine conversion
and the stability of the Co ii imine complex 2 are investigated. Furthermore,
the solution dynamics of Co ii complexes are highlighted with the help of
paramagnetic 1 H-NMR spectroscopy.

A bioinspired catalytic aerobic oxidative C-H functionalization of primary
aliphatic amines : synthesis of 1,2-disubstituted benzimidazoles. This is an
open access article under the terms of Creative Commons Attribution
NonCommercial-NoDerivs License, which permits use and distribution in any
medium, provided the original work is properly cited, the use is non-commercial
and no modifications or adaptations are made. The notable features of our
catalytic protocol such as the use of air as the benign oxidant and EtOH as the
solvent, mild conditions, ease of product separation, being scalable up to the
gram level, and superior reusability of catalyst up to 10 cycles make it more
practical and environmentally friendly for organic synthesis.

Oxidation using quaternary ammonium polyhalides VII. Oxidation of primary amines
and hydrazo compounds by use of benzyltrimethylammonium tribromide. The
reactions of primary amines and hydrazo compounds with benzyltrimethylammonium
tribromide in aqueous sodium hydroxide or in water gave the corresponding
nitriles and azo compounds in satisfactory yields, respectively.

Damage to DNA from the metabolites of drugs and pollutants constitutes a major
human toxicity pathway known as genotoxicity. Guanines are the main DNA
oxidation sites, and 8-oxo-7,8-dihydrodeoxyguanosine 8-oxodG is the initial
product. Here we describe a novel electrochemiluminescent ECL microwell array
that produces metabolites from test compounds and measures relative rates of DNA
oxidation and DNA adduct damage. In this new array, films of DNA, metabolic
enzymes, and an ECL metallopolymer or complex assembled in microwells on a
pyrolytic graphite wafer are housed in dual microfluidic chambers.

The array limit of detection for oxidation was 8-oxodG per 10 6 nucleobases. The
enantioselective cascade of the presented reaction was successfully utilized in
the synthesis of octahydropyrazinopyridoindole and its higher ring analogues.
Difunctionalization of alkenes has become a powerful tool for quickly increasing
molecular complexity in synthesis.


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Despite significant progress in the area of alkene difunctionalization involving
the incorporation of a nitrogen atom across the C-C double bonds, approaches for
the direct 1,2-carboamination of alkenes to produce linear N-containing
molecules are scarce and remain a formidable challenge. Here we describe a
radical-mediated oxidative intermolecular 1,2-alkylamination of alkenes with
alkyl nitriles and amines involving C sp3 -H oxidative functionalization
catalysed by a combination of Ag2CO3 with iron Lewis acids. Moreover, an
increase in AO concentration has a meaningful synergistic effect on the initial
formulation properties.

Phosphotungstic acid encapsulated in the mesocages of amine -functionalized
metal-organic frameworks for catalytic oxidative desulfurization. Moreover, it
can be easily recovered and recycled several times without leaching and loss of
activity. Oxidation of alcohols and amines is catalyzed by multiple families of
flavin-and pyridine nucleotide-dependent enzymes. Measurement of solvent isotope
effects provides a unique mechanistic probe of the timing of the cleavage of the
OH and NH bonds, necessary information for a complete description of the
catalytic mechanism.

The inherent ambiguities in interpretation of solvent isotope effects can be
significantly decreased if isotope effects arising from isotopically labeled
substrates are measured in combination with solvent isotope effects. The
application of combined solvent and substrate mainly deuterium isotope effects
to multiple enzymes is described here to illustrate the range of mechanistic
insights that such an approach can provide. Metal-free oxidative olefination of
primary amines with benzylic C-H bonds through direct deamination and C-H bond
activation.

An oxidative olefination reaction between aliphatic primary amines and benzylic
sp 3 C-H bonds has been achieved using N-bromosuccinimide as catalyst and
tert-butyl hydroperoxide as oxidant. The olefination proceeds under mild
metal-free conditions through direct deamination and benzylic C-H bond
activation, and provides easy access to biologically active 2-styrylquinolines
with E -configuration.

Probing the Compound I-like reactivity of a bare high-valent oxo iron porphyrin
complex: the oxidation of tertiary amines. The mechanisms of oxidative
N-dealkylation of amines by heme enzymes including peroxidases and cytochromes P
and by functional models for the active Compound I species have long been
studied. A debated issue has concerned in particular the character of the
primary step initiating the oxidation sequence, either a hydrogen atom transfer
HAT or an electron transfer ET event, facing problems such as the possible
contribution of multiple oxidants and complex environmental effects.

The gas-phase reaction with amines A studied by ESI-FT-ICR mass spectrometry has
revealed for the first time the elementary steps and the ionic intermediates
involved in the oxidative activation. The reaction appears to be initiated by an
ET event for the majority of the tested amines which included tertiary aliphatic
and aromatic amines as well as a cyclic and a secondary amine.

For a series of N,N-dimethylanilines the reaction efficiency for the ET
activated pathways was found to correlate with the ionization energy of the
amine. The kinetic isotope effect KIE for proton transfer PT increases as the
acidity of the amine radical cation increases and the PT reaction to the base.
Sulfonated reduced graphene oxide as a highly efficient catalyst for direct
amidation of carboxylic acids with amines using ultrasonic irradiation.
Sulfonated reduced graphene oxide nanosheets rGO-SO3H were prepared by grafting
sulfonic acid-containing aryl radicals onto chemically reduced graphene oxide
rGO under sonochemical conditions.

Influence of cooking methods and storage time on lipid and protein oxidation and
heterocyclic aromatic amines production in bacon. Forty-four pork bellies
selected from pigs varying in breed, sex and diets to introduce variability in
composition were processed as bacon. Overall, microwave cooking had lesser
impact on the production of carcinogenic compounds in bacon with only minor
impact on sensory attributes.

Published by Elsevier Ltd. Reaction of CO2 with propylene oxide and styrene
oxide catalyzed by a chromium III amine -bis phenolate complex. The synthesis of
this metal complex is straightforward and it can be obtained in high yields.

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This catalyst incorporates a tripodal amine -bis phenolate ligand, which differs
from the salen or salan ligands typically used with Cr and Co complexes that
have been employed as catalysts for the synthesis of such polycarbonates. The
catalyst reported herein yields low molecular weight polymers with narrow
polydispersities when the reaction is performed at room temperature. Performing
the reaction at elevated temperatures causes the selective synthesis of
propylene carbonate. The copolymerization activity for propylene oxide and
carbon dioxide, as well as the coupling of carbon dioxide and styrene oxide to
give styrene carbonate are presented.

Although the scope and limitations have not been fully established, the present
procedure offers an attractive alternative to the conventional methods with its
mildness and chemoselectivity as well as high yields. Further investigations of
more useful applications with this system are currently in progress.

The Oppenauer reaction converts secondary alcohols into ketones, and these can
subsequently The mathematical model developed considers that each reaction is
performed in a single ideally mixed isothermal reactor operating Photocatalytic
organic transformation by layered double hydroxides: highly efficient and
selective oxidation of primary aromatic amines to their imines under ambient
aerobic conditions.

We report the first application of layered double hydroxide as a photocatalyst
in the transformation of primary aromatic amines to their corresponding imines
with high efficiency and selectivity by using oxygen in an air atmosphere as a
terminal oxidant under light irradiation.

New strategies for the oxidative cycloaddition of enones with enamines are
developed. These cycloaddition reactions directly afford substituted aromatic
amines , which are important in organic chemistry, in moderate to good yield.
The halogens were recovered as the amminium salts, amine , HX. The oxidized
amine dimerized to form a yellow product which was recovered as an oily liquid
but in very small amounts.

However, in the reaction between Mo CO4Br2 and 1-ethylpiperidine, a yellow
crystalline solid, with a melting point of oC was recovered in sufficient
amounts for elemental analysis, melting point and spectral data. Factors
affecting the photovoltaic behavior of inverted polymer solar cells using
various indium tin oxide electrodes modified by amines with simple chemical
structures. The superior performance of the cell containing the amine -modified
electrode with large N was perhaps because the energy mismatch formed by a
contact between ITO and acceptor PCBM reduced, and consequently the rate of
electron collection at ITO increased.

Vanadium-substituted heteropolyacids immobilized on amine - functionalized
mesoporous MCM A recyclable catalyst for selective oxidation of alcohols with
H2O2. Graphical abstract: Vanadium-substituted phosphotungstic acids are
immobilized on amine - functionalized mesoporous MCM and the hybrid catalyst is
proved to be a highly efficient solid catalyst for the oxidation of aromatic
alcohols to the corresponding carbonyl compounds with H 2 O 2 , featured by the
high conversion and selectivity, easy recovery, and quite steady reuse.

It is found that the structure of the heteropolyacids is retained upon
immobilization over mesoporous materials. The hybrid catalyst is proved to be a
highly efficient recyclable solid catalyst for the selective oxidation of
aromatic alcohols to the corresponding aldehydes with H 2 O 2. Catalytic
oxidation of o-aminophenols and aromatic amines by mushroom tyrosinase.

The kinetics of tyrosinase acting on o-aminophenols and aromatic amines as
substrates was studied. The catalytic constants of aromatic monoamines and
o-diamines were both low, these results are consistent with our previous
mechanism in which the slow step is the transfer of a proton by a hydroxyl to
the peroxide in oxy-tyrosinase Fenoll et al. In the case of o-aminophenols, the
hydroxyl group indirectly cooperates in the transfer of the proton and
consequently the catalytic constants in the action of tyrosinase on these
compounds are higher.

In the case of aromatic o-diamines, both the catalytic and Michaelis constants
are low, the values of the catalytic constants being lower than those of the
corresponding o-diphenols. The values of the Michaelis constants of the aromatic
o-diamines are slightly lower than those of their corresponding o-diphenols,
confirming that the aromatic o-diamines bind less well lower binding constant to
the enzyme.

Comparison of the reactivity of alkyl and alkyl amine precursors with native
oxide GaAs and InAs surfaces.

We find that there are distinct differences in the behavior of the two films.
Differences are also found in the behavior of the arsenic oxides of the InAs and
GaAs substrates. The arsenic oxides from the InAs surface are found to mix more
efficiently in the growing dielectric film than those from the GaAs surface.
This difference is attributed to. This difference is attributed to lower native
oxide stability as well as an initial diffusion path formation by the indium
oxides.

Full Text Available Marine and inland pollution by non-degradable plastic bags
and other plastic articles is a topic of great concern. Natural degradation
processes based on oxidation of plastic pollutants could possibly contribute to
limit the extent of pollution. Thermal degradation of polyolefins in the absence
of light by non-polluting pro- oxidants has not been presented before.

In this study, we show that two amines , stearyl amine and [ 3- aminoundecanoyl
amino propane] silsesquioxane amino-POSS in combination with ferric stearate
FeSt3 tremendously accelerate the thermal oxidation of polyolefins compared with
reference samples. Both amines and FeSt3 are to a large extent based on
renewable resources. No significant degradation could be seen with samples
containing iron but no amine. In a different application, the initial oxidation
of polyethylene can be used in order to increase its adhesion to cardboard.

Excellent adhesion between polyethylene and cardboard is important for liquid
packaging based on renewable resources. Amino-POSS has been chosen for food
packaging applications due to its expected lower leakage from polyethylene PE
compared with stearyl amine. The limited extent of oxidation has been proved by
unchanged tensile strength and only moderate changes in elongation at break when
compared to reference polyethylene films containing no FeSt3 or amino-POSS.

The adhesion of non-aged blends to paperboard decreased with increasing
amino-POSS content which is in good compliance with an earlier reported
lubricant effect of high. Free terminal amines in DNA-binding peptides alter the
product distribution from guanine radicals produced by single electron
oxidation. Electron deficient guanine radical species are major intermediates
produced in DNA by the direct effect of ionizing irradiation. There is evidence
that they react with amine groups in closely bound ligands to form covalent
crosslinks. Crosslink formation is very poorly characterized in terms of
quantitative rate and yield data.

We sought to address this issue by using oligo-arginine ligands to model the
close association of DNA and its binding proteins in chromatin. Guanine radicals
were prepared in plasmid DNA by single electron oxidation.

The product distribution derived from them was assayed by strand break formation
after four different post-irradiation incubations. We compared the yields of DNA
damage produced in the presence of four ligands in which neither, one, or both
of the amino and carboxylate termini were blocked with amides. Free carboxylate
groups were unreactive.


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Significantly higher yields of heat labile sites were observed when the amino
terminus was unblocked. The rate of the reaction was characterized by diluting
the unblocked amino group with its amide blocked derivative. These observations
provide a means to develop quantitative estimates for the yields in which these
labile sites are formed in chromatin by exposure to ionizing irradiation.


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A metalloenzyme-like catalytic system for the chemoselective oxidative
cross-coupling of primary amines to imines under ambient conditions. The direct
oxidative cross-coupling of primary amines is a challenging transformation as
homocoupling is usually preferred. We report herein the chemoselective
preparation of cross-coupled imines through the synergistic combination of low
loadings of Cu II metal-catalyst and o-iminoquinone organocatalyst under ambient
conditions.


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