Results 141 to 150 of about 72,024 (299)

Opium trade and use during the Late Bronze Age: Organic residue analysis of ceramic vessels from the burials of Tel Yehud, Israel

Archaeometry, EarlyView., 2022
Abstract Organic residue analysis was conducted on various vessels from burials at Tel Yehud, Israel. The analyses led to new reliable evidence for the presence of opioid alkaloids and their decomposition products. This research revitalizes a decades‐old discussion on the presence and function of the opium trade across a cultural region of utmost ...
Vanessa Linares, Eriola Jakoel, Ron Be’eri, Oded Lipschits, Ronny Neumann, Yuval Gadot   +5 more
wiley   +1 more source

Z‐Scheme BiOCl‐Based Photocatalysts: Recent Advances in Designing, Structural Engineering, Formation Mechanisms, and High Performance Photocatalytic Environmental Remediation

EcoEnergy, EarlyView.
This review deals with the recent advancements in design and engineering of BiOCl‐based Z‐scheme photocatalysts with emphasis on tailoring of structural, optoelectronic properties and heterojunction assembly for environmental applications including photodegradation of industrial organic waste, pharmaceuticals, pesticides, herbicides, toxic heavy metals,
Sakshi Sharma, Neha Kaushal, Victor Ezebuiro, Monika Sindhu, Lovepreet Singh, Yugesh Singh Thakur, Hendrik C. Swart, Jai Prakash   +7 more
wiley   +1 more source

Photoreversible Polyurea Actuators With Spatiotemporal Control and Adaptive Mechanics

ENERGY &ENVIRONMENTAL MATERIALS, EarlyView.
A light–thermal responsive polyurea network incorporating reversibly dimerizable anthracene units enables spatiotemporal modulation of cross‐linking density and nearly 400‐fold stiffness tuning. Integrating programmable anisotropy, photopatterning, self‐healing, and photowelding within a single framework, this bioinspired “one network–multifunction ...
Zhiwen Song, Wang Li, Xinru Guo, Rui Pu, Wenxin Wang, Yujun Cheng, Liang Shen, Fei Gao   +7 more
wiley   +1 more source

Natural Anthraquinone‐Like Compound Extracted from Green Husk of Walnut Improves Photocatalytic H2O2 Production Catalyzed by TiO2 Nanoparticles

ENERGY &ENVIRONMENTAL MATERIALS, EarlyView.
In this work, a novel biomolecule/semiconductor hybrid catalyst was prepared by loading anthraquinone‐liked juglone onto anatase TiO2. This catalyst exhibited high photocatalytic activity for H2O2 production. Hydrogen peroxide (H2O2) is a vital oxidant with broad industrial applications, and its production via photocatalysis represents a highly ...
Zengyin He, Cui Li, Mingze Ni, Shu Lin, Kezhen Qi   +4 more
wiley   +1 more source

Copper Complexes with Arylated Triethylenetetramine Ligands: Reactivity Toward Dioxygen and Peroxides

European Journal of Inorganic Chemistry, EarlyView.
Here, we describe new Cu(I)/Cu(II) complexes based on arylated tren ligands and investigate their reactivity toward O2 and peroxides. Low‐temperature–stopped flow studies revealed the formation of transient copper–oxygen species, including superoxido, hydroperoxido, and alkylperoxido intermediates.
Chiara Eleonora Campi, Christian Würtele, Siegfried Schindler   +2 more
wiley   +1 more source

Electrolytic Synthesis of Benzoic Anhydride from Benzoic Acid

Electrolysis of benzoic acid was investigated by means of controlled current operation in acetonitrile with platinum disk electrodes. Benzoic anhydride was obtained from an anolyte at 20-30% of current efficiency as one electron reaction.
TAKAHASHI, Takeshige, KAMADA, Mitsushi, 高橋, 武重, 鎌田, 三司   +3 more
core  

Redox Properties of Catalytically Generated Iminium Ions From α,β‐Unsaturated Aldehydes and Chiral Secondary Amines

European Journal of Organic Chemistry, EarlyView.
We present a rapid, operationally simple, and broadly applicable protocol for the catalytic formation and in situ electrochemical characterization of chiral a,b‐unsaturated iminium ions by cyclic voltammetry (CV). Using only 5 mol% of the aminocatalyst, we systematically measure the reduction potential of over 50 iminium intermediates, revealing how ...
Martí Gisbert, Paula Rodríguez, Xavier Companyó   +2 more
wiley   +1 more source

Electrochemical oxidation of benzoic acid on boron doped diamond electrodes

The oxidn. of benzoic acid has been performed on boron doped diamond electrodes supported on silicon substrate. The voltammetric behavior has shown that during the oxidn.
Montilla, F., Comninellis, Ch, Michaud, P. A., Morallon, E., Vazquez, J. L.   +4 more
core  

Iminodirhodium‐ and Iminocopper‐Catalyzed CH Activation: Chemoselective Oxidation of Alcohols and Aldehydes via Intermolecular Hydride Abstraction

European Journal of Organic Chemistry, EarlyView.
Chemoselective hydride abstractor iminometalloids, derived from O‐mesylacetoxime (MAO) using Rh2(II/II) or Cu(I) catalysts, can activate the C–Hα bonds of alcohols and aldehydes ultimately forming ketones, carboxylic acids, and esters even in the presence of C–H bonds with comparable bond strengths.
Raghunath Reddy Anugu, John R. Falck, Adeniyi M. Adebesin   +2 more
wiley   +1 more source

Diaryl Thiourea Catalysts Promote the Formation of Propargyl Enol Ethers in the Claisen Rearrangement Sequence

European Journal of Organic Chemistry, EarlyView.
The allenyl ketone products of an enol ether formation–propargyl Claisen rearrangement sequence are susceptible to acid‐catalyzed isomerization to yield the corresponding conjugated dienones. A diaryl thiourea catalyst was found to promote the desired reaction sequence while suppressing the competing isomerization.
Veera K. Bruce‐Salmenkivi, Kaveh Farshadfar, Kari Laasonen, Petri M. Pihko   +3 more
wiley   +1 more source