Chemistry & Earth Sciences: Recent submissions
Now showing items 141-160 of 587
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Constituents of plants growing in Qatar - Part XIX. Flavonoids of Glossonema edule N. E. Br.
( Springer Nature , 1990 , Article)The study of the flavonoids of the unripe fruits of Glossonema edule, resulted in the isolation and identification of apigenin 6,8-di-C-glucoside (violanthin) and luteolin 7-O-glucoside. © 1990 Kluwer Academic Publishers. -
Constituents of plants growing in Qatar XX. Phytochemical investigation of anastatica hierochuntica: NOTE
( Taylor & Francis , 1993 , Article)A study of the lipid fraction of Anastatica hierochuntica (Cruciferae) resulted in the isolation of hydrocarbon (mainly C25H52, C29H60 AND C31H64) AND sterol fractions (P-sitosterol, campesterol, stigmasterol AND cholesterol). ... -
Sesquiterpene lactones from Pulicaria sicula
( Elsevier , 1988 , Article)The aerial parts of Pulicaria sicula afforded the known xanthanolides 1-6, the guaianolides 7 and 8 as well as two new ones, the lactone 9 and the corresponding epoxide 10. Furthermore nerylisobutyrate and the thymol ... -
Development of Inorganically Cross-Linked Sulfonated Polyacrylamide Preformed Particle Gels for Conformance Control: Impact of Anionic Groups
( American Chemical Society (ACS) , 2024 , Article)Modern oil and gas extraction faces challenges, notably from the surplus of produced water, hampering hydrocarbon recovery and raising environmental and economic concerns. A promising solution is the injection of preformed ... -
Enhanced adsorptive removal of rifampicin and tigecycline from single system using nano-ceria decorated biochar of mango seed kernel
( Elsevier , 2023 , Article)Pharmaceutically active compounds (PhACs) represent an emerging class of contaminants. With a potential to negatively impact human health and the ecosystem, existence of pharmaceuticals in the aquatic systems is becoming ... -
Metal complex as p-type dopant-based organic spiro-OMeTAD hole-transporting material for free-Li-TFSI perovskite solar cells
( American Institute of Physics , 2024 , Article)Lithium bis(fluorosulfonyl)imide (Li-TFSI) is an efficient p-dopant that has been used to enhance the conductivity of perovskite solar cells (PSCs). However, the performance of the corresponding devices is still not ... -
Nonheme Fe(IV) Oxo Complexes of Two New Pentadentate Ligands and Their Hydrogen-Atom and Oxygen-Atom Transfer Reactions
( American Chemical Society (ACS) , 2015 , Article)Two new pentadentate {N5} donor ligands based on the N4Py (N4Py = N,N-bis(2-pyridylmethyl)-N-bis(2-pyridyl)methylamine) framework have been synthesized, viz. [N-(1-methyl-2-benzimidazolyl)methyl-N-(2-pyridyl)methyl-N-(bi ... -
Catalytic C-H oxidations by nonheme mononuclear Fe(II) complexes of two pentadentate ligands: Evidence for an Fe(IV) oxo intermediate
( Elsevier , 2016 , Article)The oxidation reactions of alkanes with hydrogen peroxide and peracids (peracetic acid (PAA) and m-chloroperoxybenzoic acid (mCPBA)) catalysed by two Fe(II) complexes of pentadentate {N5}-donor ligands have been investigated. ... -
One‐pot microwave‐assisted synthesis of water‐soluble pyran‐2,4,5‐triol glucose amine schiff base derivative: Xrd/hsa interactions, crystal structure, spectral, thermal and a DFT/TD‐DFT
( MDPI AG , 2021 , Article)The(3R,4R,6R)‐3‐(((E)‐2‐hydroxybenzylidene)amino)‐6‐(hydroxymethyl)tetrahydro‐2H-pyran‐2,4,5‐triol water‐soluble Glucose amine Schiff base (GASB‐1) product was made available by condensation of 2‐hydroxybenzaldehyde with ... -
Crystal structure, spectral, thermal and experimental/computational investigation of Anthracen-benzo[d]thiazol-2-amine new Schiff base derivative
( Elsevier B.V. , 2021 , Article)The N-S-N-tridentate ((E)-N-(anthracen-9-ylmethylene)benzo[d]thiazol-2-amine product was made available by dehydration of 2-Aminobenzothiazole with 9-anthraldehyde under non-classical microwave condition, five-minute ... -
(E)-2-{[4-(dimethylamino)benzylidene]amino}-5-nitrophenol
( International Union of Crystallography , 2014 , Article)The title Schiff base compound, C15H15N 3O3, crystallizes with two molecules (A and B) in the asymmetric unit. Each molecule adopts an E conformation around the C= N imine bond. The two molecules have minor differences in ... -
A Novel Green Synthesis of Thalidomide and Analogs
( Hindawi Limited , 2017 , Article)Thalidomide and its derivatives are currently under investigation for their antiangiogenic, immunomodulative, and anticancer properties. Current methods used to synthesize these compounds involve multiple steps and extensive ... -
Crystal structure of the thalidomide analog (3aR∗,7aS∗)-2-(2,6-dioxopiperidin-3-yl)hexahydro-1H-isoindole-1,3(2H)-dione
( International Union of Crystallography , 2018 , Article)The title compound, C13H16N2O4, crystallizes in the monoclinic centrosymmetric space group, P21/c, with four molecules in the asymmetric unit, thus there is no crystallographically imposed symmetry and it is a racemic ... -
A Comparison between Different Agro-wastes and Carbon Nanotubes for Removal of Sarafloxacin from Wastewater: Kinetics and Equilibrium Studies
( Multidisciplinary Digital Publishing Institute (MDPI) , 2020 , Article)In the current study, eco-structured and efficient removal of the veterinary fluoroquinolone antibiotic sarafloxacin (SARA) from wastewater has been explored. The adsorptive power of four agro-wastes (AWs) derived from ... -
Regulatory Mechanisms That Guide the Fetal to Postnatal Transition of Cardiomyocytes
( Multidisciplinary Digital Publishing Institute (MDPI) , 2023 , Article)Heart disease remains a global leading cause of death and disability, necessitating a comprehensive understanding of the heart’s development, repair, and dysfunction. This review surveys recent discoveries that explore the ... -
Mechanochemical arylative detrifluoromethylation of trifluoromethylarenes
( Royal Society of Chemistry , 2023 , Article)The stoichiometric defluorinative functionalization of ArCF3 is a conceptually appealing research target. It enables the challenging late-stage functionalization of CF3-containing aromatic molecules and contributes to the ... -
Experimental and theoretical investigations of the effect of bis-phenylurea-based aliphatic amine derivative as an efficient green corrosion inhibitor for carbon steel in HCl solution
( Elsevier , 2023 , Article)A novel bis-phenylurea-based aliphatic amine (BPUA) was prepared via a facile synthetic route, and evaluated as a potential green organic corrosion inhibitor for carbon steel in 1.0 M HCl solutions. NMR spectroscopy ... -
Spectrofluorometric investigations on the solvent effects on the photocyclization reaction of diclofenac
( Elsevier , 2023 , Article)The solvent effects on the photochemical conversion rate of the photosensitizing drug diclofenac (DCF) were investigated using steady-state fluorescence spectroscopy. The spectral information obtained for the photochemical ... -
l-Proline-Catalyzed Three-Component Reaction of 4-Chloro-3-formylcoumarin, Sodium Sulfide, and α-Halo Ketones: A Direct Approach to Thieno[3,2- c ]coumarins
( Georg Thieme Verlag KG , 2023 , Article)A new protocol for the synthesis of thieno[3,2-c]coumarins is disclosed. In this method, a 3-formyl-2-oxo-2H-chromene-4-thiolate anion is generated in situ by treatment of 4-chloro-3-formylcoumarin with sodium sulfide. ... -
Uv-l/sulfite advanced reduction process as an efficient method for chlorate reduction in water
( Desalination Publications , 2021 , Article)The efficient reduction of disinfection by-products (DBPs) is currently a major challenge in water treatment facilities due to their high toxicity to human health and long-time residence in the environment. In this work, ...
