Results 71 to 80 of about 7,389 (151)

The use of activated carbon derived from spent coffee grounds as a reusable, sustainable, and effective solution for the removal of butylparaben from water

Journal of Chemical Technology &Biotechnology, Volume 101, Issue 8, Page 1547-1558, August 2026.
Abstract BACKGROUND Parabens, including butylparaben (BP), are widely used as antimicrobial preservatives in food, cosmetics, and pharmaceuticals, yet are poorly removed by conventional water treatment processes and pose potential risks to aquatic life and human health.
Lorena Maihury Santos Tsubouchi, Diane Scapin, Gideã Taques Tractz, Flávia Aparecida Reitz Cardoso, Lúcio Cardozo‐Filho, Alessandro Francisco Martins, Diógenes Vedoy, Ana Paula Peron, Osvaldo Valarini Junior   +8 more
wiley   +1 more source

A Solvent‐Free Synthesis of Imidazo[1,5‐a]pyridines Using CCl4 as an Oxidant

Journal of Heterocyclic Chemistry, Volume 63, Issue 8, Page 1288-1299, August 2026.
A solvent‐free synthesis of imidazo[1,5‐a]pyridines (Impys) using CCl4 as an oxidant reagent and DBU as the base is informed. An array of Impys derived from different benzylic, heteroaryl aldehydes and others was synthesized in moderate to good yields.
Alejandro Castillo‐Baltazar, Luis E. Mendoza‐Herrera, Alfredo Toscano, J. Armando Luján‐Montelongo, M. Carmen Ortega‐Alfaro, José G. López‐Cortés   +5 more
wiley   +1 more source

Direct conversion of various phosphate sources to a versatile P-X reagent [TBA][PO2X2] via redox-neutral halogenation

Nature Communications
Inorganic phosphates hold significant potential as ideal natural building blocks, forming a fundamental basis for organic and biochemical synthesis.
Yaling Tian, Dong-ping Chen, Yao Chai, Ming Li, Xi-Cun Wang, Zhengyin Du, Xiaofeng Wu, Zheng-Jun Quan   +7 more
doaj   +1 more source

The X‐Ray Crystal Structure of BorF, the Flavin Reductase Subunit of a Two‐Component Flavin‐Dependent Tryptophan Halogenase

Proteins: Structure, Function, and Bioinformatics, Volume 94, Issue 8, Page 1529-1540, August 2026.
ABSTRACT BorF is a short‐chain flavin reductase from a desert soil bacterium that uses NADH to reduce FAD to FADH2, which is used by the tryptophan‐6‐halogenase BorH to chlorinate tryptophan in the biosynthetic pathway of borregomycin A. The X‐ray crystal structure of BorF bound to FAD was solved to 2.37 Å by molecular replacement.
Zheng Ma, Emily W. Rady, Aravinda J. de Silva, John J. Bellizzi III   +3 more
wiley   +1 more source

Pyridine C─N Transposition via Cycloaddition–Cycloreversion

Angewandte Chemie, Volume 138, Issue 29, 13 July 2026.
Transposition of pyridine nitrogen from the 4‐ to the 3‐position is described using two open and shut sequences: a nucleophile addition ring‐open ring‐closure, followed by a nitrile Diels–Alder cycloaddition cycloreversion. The nitrogen swap is particularly effective for tertiary alkyl substituents, transforming easily accessible para‐alkylated ...
Aífe Conboy, Michael F. Greaney
wiley   +2 more sources

Synthesis of N‐Benzyl o‐Methoxy Phase I Metabolites for Use as Liquid Chromatography‐Quadrupole Time of Flight Standards

ChemistrySelect, Volume 11, Issue 30, 10 August 2026.
A novel synthetic method for three phase I o‐desmethyl NBOMe metabolites bromo‐ (3a) and iodo‐ (13b) and chloro‐ analogue (13c) was developed. LC‐QToF analysis confirmed that the synthetic standards matched the major peaks observed in urine sample screens for each of the respective halogen‐substituted metabolites indicating that the synthesised ...
Jordan Spangler, Martin R. Johnston, Peter Stockham   +2 more
wiley   +1 more source

Von Richter Cinnolines Synthesis Revisited—Approach to Polysubstituted Cinnoline Derivatives as Important Scaffolds for Kinase Inhibitors

ChemistrySelect, Volume 11, Issue 29, 3 August 2026.
A revised von Richter cyclization of 2‐aminoalkyne precursors enables the synthesis of polysubstituted 4‐halocinnoline derivatives. By addressing the key challenge of hydrolytic instability, this catalyst‐free approach delivers scaffolds amenable to late‐stage C‐4 functionalization.
Krystof Skach, Milan Dejmek, Michal Sala, Radim Nencka   +3 more
wiley   +1 more source

Light on the sustainable preparation of aryl-cored dibromides

Beilstein Journal of Organic Chemistry
Both aryl and benzyl polybromides have gained significant importance as reactive building blocks in polymer and materials chemistry. Their preparation primarily relies on established synthetic methods using molecular bromine or N-bromosuccinimide, known ...
Fabrizio Roncaglia, Alberto Ughetti, Nicola Porcelli, Biagio Anderlini, Andrea Severini, Luca Rigamonti   +5 more
doaj   +1 more source

Anion Transfer Reactions from Chiral Hypervalent Iodine Macrocycles

Organics
The direct chlorination, bromination and azidation of beta keto esters, 2-acetyl-1-tetralone and methyl 1-oxo-2,3-dihydro-1H-indene-2-carboxylate is achieved utilizing anion-coordinated hypervalent iodine benziodazoles derived from hypervalent iodine ...
Mina Dumre Pandey, Tahir Awais, Krishna Pandey, Samsul Arafin, Eli Jones, Kyle N. Plunkett   +5 more
doaj   +1 more source

S‐Adenosyl‐d‐Methionine as a Non‐Physiological Substrate for a Wide Range of SAM‐Dependent Enzymes

ChemBioChem, Volume 27, Issue 14, 29 July 2026.
From methylation and cyclisation to radical chemistry, diverse enzyme classes utilise the non‐canonical cofactor d‐SAM. These findings reveal an unexpected tolerance of SAM‐dependent catalysis towards inversion of the methionine Cα stereocentre. The ability of SAM‐dependent enzymes to accept S‐adenosyl‐d‐methionine [d‐SAM, (SS,RCα)‐SAM] instead of the ...
Philipp Germer, Lukas Gericke, Lars‐Hendrik Koeppl, Ziruo Zou, Emely Jockmann, Marco Kuge, Katrin Zoller, Hannah Herrmann, Ronja Fuderer, Michael K. F. Mohr, Agnes Bartels, Göksu Oral, Peer Lukat, Gunhild Layer, Michael Müller, Wulf Blankenfeldt, Lena Barra, Jennifer N. Andexer   +17 more
wiley   +1 more source