Results 41 to 50 of about 227,778 (210)

Simultaneous Determination of the Contents of Quinoline, Pyridine and Crotonaldehyde in Footwear Materials by Gas Chromatography-Mass Spectrometry Method

open access: yesPige Kexue Yu Gongcheng
A gas chromatography-mass spectrometry (GC-MS) method was developed for the simultaneous determination of quinoline, pyridine, and crotonaldehyde in footwear materials.
Yuhong TANG   +4 more
doaj   +1 more source

Synthesis and characterization of novel polyimides derived from 4,4’-bis(5-amino-2-pyridinoxy)benzophenone: effect of pyridine and ketone units in the main

open access: yesDesigned Monomers and Polymers, 2017
A diamine monomer, 4,4’-bis(5-amino-2-pyridinoxy)benzophenone, was designed and synthesized, and used to react with commercially different kinds of aromatic dianhydrides to prepare a series of polyimides containing pyridine and ketone units via the ...
Chunbo Wang   +5 more
doaj   +1 more source

N′-[(1E)-4-Hydroxy-3-methoxybenzylidene]isonicotinohydrazide monohydrate

open access: yesIUCrData, 2016
In the title hydrate, C14H13N3O3·H2O, the dihedral angle between the pyridine and benzene rings is 2.52 (9)°. Intramolecular O—H...O hydrogen bonds occur.
K. R. Roopashree   +4 more
doaj   +1 more source

Scientific Opinion on Flavouring Group Evaluation 77, Revision 2 (FGE.77Rev2): Consideration of Pyridine, Pyrrole and Quinoline Derivatives evaluated by JECFA (63rd meeting) structurally related to Pyridine, Pyrrole, Indole and Quinoline Derivatives evaluated by EFSA in FGE.24Rev2 (2013) [PDF]

open access: yesEFSA Journal, 2015
The Panel on Food Contact Materials, Enzymes, Flavourings and Processing Aids of the European Food Safety Authority was requested to consider evaluations of flavouring substances assessed since 2000 by the Joint FAO/WHO Expert Committee on Food Additives
EFSA Panel on Food Contact Materials, Enzymes, Flavourings and Processing Aids (CEF)
doaj   +1 more source

Discovering the stacking landscape of a pyridine-pyridine system [PDF]

open access: yesJournal of Molecular Modeling, 2017
Extremely extensive calculations of potential energy surfaces for the parallel-displaced configuration of pyridine dimer systems have been carried out using a dispersion-corrected density functional. Instead of focusing on stationary geometries these calculations provide much deeper insight into the "landscape" of the interaction energies of the ...
openaire   +2 more sources

Energetic and Geometric Characteristics of the Substituents: Part 2: The Case of NO2, Cl, and NH2 Groups in Their Mono-Substituted Derivatives of Simple Nitrogen Heterocycles

open access: yesMolecules, 2021
Variously substituted N-heterocyclic compounds are widespread across bio- and medicinal chemistry. The work aims to computationally evaluate the influence of the type of N-heterocyclic compound and the substitution position on the properties of three ...
Paweł A. Wieczorkiewicz   +2 more
doaj   +1 more source

3-Position-Selective C–H Trifluoromethylation of Pyridine Rings Based on Nucleophilic Activation [PDF]

open access: yes, 2022
The first example of the 3-position-selective C(sp2)–H trifluoromethylation of pyridine rings was established. 3-Position-selective trifluoromethylation was achieved by the nucleophilic activation of pyridine and quinoline derivatives through ...
Yoichiro, Kuninobu   +2 more
core   +2 more sources

Modeling of adsorption isotherms and competitive adsorption breakthroughs of Nicotine/Pyridine removal from aqueous solution by activated Montmorillonite [PDF]

open access: yesJournal of Water and Environmental Nanotechnology, 2020
Activated Montmorillonite (AM) reveals as a low-cost and efficient adsorbent for the adsorption of nicotine and pyridine from aqueous solutions. In this study, the influence of several operation conditions (initial compounds concentration, volumetric ...
Zeinab Ibrahim   +7 more
doaj   +1 more source

Pyridine-Derived Oxazolidines as Chiral 3-Alkyl-4,5-dihydropyridinium and 3-Alkyl-3,4,5,6-tetrahydropyridinium Salt Equivalents

open access: yes, 2016
Pyridine-Derived Oxazolidines as Chiral 3-Alkyl-4,5-dihydropyridinium and 3-Alkyl-3,4,5,6-tetrahydropyridinium Salt ...
Bhupesh C. Das (3004164)   +5 more
core   +1 more source

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