scholarly journals A Green Approach to the Production of 2-pyridone Derivatives Promoted by Infrared Irradiation

2017 ◽  
Vol 58 (2) ◽  
Author(s):  
Fernando Hernández ◽  
Fabiola De la Cruz ◽  
Julio López ◽  
Eduardo Peña ◽  
Francisco Delgado ◽  
...  
Keyword(s):  
Spectroscopic Techniques ◽  
Infrared Irradiation ◽  
X Ray Diffraction ◽  
Reaction Conditions ◽  
X Ray ◽  
H Nmr ◽  
Green Approach ◽  
Ft Ir ◽  
Target Molecules ◽  
C Nmr

<p>An alternative is presented for promoting a reaction with infrared irradiation to obtain different 4-aryl-3-cyano-5-ethoxycarbonyl-6-methyl-2-pyridone derivatives <strong>9a-k</strong>. The process was carried out with a green approach from the corresponding 4<em>H</em>-pyrans, using mild reaction conditions and infrared irradiation as the energy source. In the first stage, the reaction produced 1,2,3,4-tetrahydropyridin-2-one derivatives <strong>8a-k</strong>, followed by an oxidative step to afford the target molecules in good yields. The structure of products <strong>9a-k</strong> was confirmed by FT-IR, <sup>1</sup>H NMR and <sup>13</sup>C NMR spectroscopic techniques and X-ray diffraction. It was found that the efficiency of the reaction depends on the catalyst and the solvent, as well as on the aldehyde substituents.</p>

scholarly journals Crystal structure of (E)-4-hydroxy-6-methyl-3-{1-[2-(4-nitrophenyl)hydrazinylidene]ethyl}-2H-pyran-2-one

2017 ◽  
Vol 73 (2) ◽  
pp. 223-226 ◽  
Author(s):  
Kirandeep ◽  
Ahmad Husain ◽  
Pooja Negi ◽  
Girijesh Kumar ◽  
Ramesh Kataria
Keyword(s):  
Single Crystal ◽  
Crystal Packing ◽  
Molar Ratio ◽  
X Ray Diffraction ◽  
X Ray ◽  
H Nmr ◽  
Dehydroacetic Acid ◽  
Compound C ◽  
Ft Ir ◽  
C Nmr

The title compound, C14H13N3O5(HMNP), was synthesized by the simple condensation ofp-nitrophenylhydrazine with dehydroacetic acid (DHA) in a 1:1 molar ratio in ethanol. HMNP has been characterized by using FT–IR,1H and13C NMR and UV–Vis spectroscopic and single-crystal X-ray diffraction techniques. The crystal packing reveals strong hydrogen bonds between the NH group and the carbonyl O atom of dihydropyranone moiety, forming chains along [101]. The thermal stability of the synthesized compound was confirmed by thermogravimetric analysis and it was found to be stable up to 513 K. The UV–Vis spectrum shows the presence of a strong band at λmax394 nm.1H NMR and single-crystal X-ray analyses confirmed the presence of theenolform of the ligand and dominance over theketoform. The crystal studied was a non-merohedral twin with the refined ratio of the twin components being 0.3720 (19):0.6280 (19).

scholarly journals Synthesis, Characterization, X-Ray Crystal Structure, and Antimicrobial Activity of 1,1′-(3,4-Diphenylthieno[2,3-b]thiophene-2,5-diyl)diethanone

2014 ◽  
Vol 2014 ◽  
pp. 1-5 ◽  
Author(s):  
Yahia Nasser Mabkhot ◽  
Fahad D. Aldawsari ◽  
S. S. Al-Showiman ◽  
Assem Barakat ◽  
M. Iqbal Choudhary ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Monoclinic Space Group ◽  
Gram Negative Bacteria ◽  
X Ray Diffraction ◽  
X Ray ◽  
Gram Positive Bacteria ◽  
H Nmr ◽  
Hydrogen Bonding Interactions ◽  
Ft Ir ◽  
C Nmr

Synthesis of 1,1′-(3,4-diphenylthieno[2,3-b]thiophene-2,5-diyl)diethanone (4) is reported here. The structure of compound4was deduced by1H-NMR,13C-NMR, FT-IR, MS, microanalysis, and single-crystal X-ray diffraction. Compound crystallizes in the monoclinic space groupP21/nwitha= 9.3126(7) Å,b= 9.5867(7) Å,c= 20.2811(15) Å,α= 90°,β= 95.436(2)°,γ= 90°,V= 1802.5(2) Å3, andZ= 4. The molecules are packed in crystal structure by weak intermolecular C10–H10A⋯ S1 hydrogen bonding interactions. Compound4can be a useful intermediate for the synthesis of diphenylthieno[2,3-b]thiophene. Compound4was found to be active against Gram-positive bacteria (Bacillus subtilisandStaphylococcus pneumoniae) and Gram-negative bacteria (Escherichia coli) and also was found to be active against fungi (Aspergillus fumigatusandCandida albicans).

Liquid crystalline polyureas with oligo(ethylene glycol) sequences

e-Polymers ◽  
2010 ◽  
Vol 10 (1) ◽  
Author(s):  
Shahram Mehdipour-Ataei ◽  
Leila Akbarian-Feizi
Keyword(s):  
Liquid Crystalline ◽  
Spectroscopic Method ◽  
Polymerization Reaction ◽  
X Ray Diffraction ◽  
Subsequent Reaction ◽  
Scanning Calorimetry ◽  
Polar Solvents ◽  
X Ray ◽  
H Nmr ◽  
Ft Ir

AbstractA diamine monomer containing ester, amide and ether functional groups was prepared and its polymerization reaction with different diisocyanates to give main chain poly(ester amide ether urea)s was investigated. The monomer was synthesized via reaction of terephthaloyl chloride with 4-hydroxybenzoic acid and subsequent reaction of the resulted diacid with 1,8-diamino-3,6-dioxaoctane. The polymers were characterized by FT-IR and 1H-NMR spectroscopic method and elemental analysis. The resulting polymers exhibited excellent solubility in polar solvents. Crystallinity of the resulted polymers was evaluated by wide-angle X-ray diffraction (WXRD) method, and they exhibited semi-crystalline patterns. The glass transition temperatures (Tg) of the polymers determined by differential scanning calorimetry (DSC) and dynamic mechanical thermal analysis (DMTA) were in the range of 88-112 °C. The temperatures for 10% weight loss (T10) from their thermogravimetric analysis (TGA) curves were found to be in the range of 297-312 °C in air. Also the prepared polyureas showed liquid crystalline character.

scholarly journals UV-Accelerated Photocatalytic Degradation of Pesticide over Magnetite and Cobalt Ferrite Decorated Graphene Oxide Composite

Plants ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 6
Author(s):  
Asma Tabasum ◽  
Mousa Alghuthaymi ◽  
Umair Yaqub Qazi ◽  
Imran Shahid ◽  
Qamar Abbas ◽  
...  
Keyword(s):  
Spectroscopic Techniques ◽  
Combined Effects ◽  
X Ray Diffraction ◽  
Contributing Factors ◽  
Reaction Conditions ◽  
X Ray ◽  
Oxidant Concentration ◽  
Optimized Conditions ◽  
High Degradation Rate ◽  
Considerable Loss

Pesticides are one of the main organic pollutants as they are highly toxic and extensively used worldwide. The reclamation of wastewater containing pesticides is of utmost importance. For this purpose, GO-doped metal ferrites (GO-Fe3O4 and GO-CoFe2O4) were prepared and characterized using scanning electron microscopy, X-ray diffraction and Fourier transform infrared spectroscopic techniques. Photocatalytic potentials of catalysts were investigated against acetamiprid’s degradation. A detailed review of the parametric study revealed that efficiency of overall Fenton’s process relies on the combined effects of contributing factors, i.e., pH, initial oxidant concentration, catalyst dose, contact time, and acetamiprid load. ~97 and ~90% degradation of the acetamiprid was achieved by GO-CoFe2O4 and GO-Fe3O4, respectively during the first hour under UV radiations at optimized reaction conditions. At optimized conditions (i.e., pH:3, [H2O2]: 14.5 mM (for Fe3O4, GO-Fe3O4, and GO-CoFe2O4) and 21.75 mM (for CoFe2O4), catalysts: 100 mgL−1, time: 60min) the catalysts exhibited excellent performance, with high degradation rate, magnetic power, easy recovery at the end, and efficient reusability (up to 5 cycles without any considerable loss in catalytic activity). A high magnetic character offers its easy separation from aqueous systems using an external magnet. Moreover, the combined effects of experimental variables were assessed simultaneously and justified using response surface methodology (RSM).

Structural, spectral and docking studies of a coordination polymer of zinc(II) formed by a pyridine-derived linker

2018 ◽  
Vol 73 (6) ◽  
pp. 369-375 ◽  
Author(s):  
Farzin Marandi ◽  
Keyvan Moeini ◽  
Fereshteh Alizadeh ◽  
Zahra Mardani ◽  
Ching Kheng Quah ◽  
...  
Keyword(s):  
Coordination Polymer ◽  
Docking Studies ◽  
Stacking Interactions ◽  
X Ray Diffraction ◽  
X Ray ◽  
H Nmr ◽  
Docking Calculations ◽  
Ft Ir ◽  
Zinc Coordination ◽  
Linear Coordination

AbstractA mixed ligand zinc coordination polymer, {Zn(μ-DPE)(DBM)2}n (1) (HDBM: dibenzoylmethane and DPE: (E)-1,2-di(pyridin-4-yl)ethene), was prepared and identified by elemental analysis, FT-IR, 1H NMR spectroscopy and single-crystal X-ray diffraction. In the 1D linear coordination polymer of 1, the zinc atom has a ZnN2O4 environment with octahedral geometry. These complex units are linked by the bridging of the planar N2 donor DPE ligands. In the coordination network of complex 1, in addition to the hydrogen bonds, the network is more stabilized by π–π stacking interactions between pyridine and β-diketone moieties of the ligands. These interactions increase the ability of the compound to interact with biomacromolecules (BRAF kinase, CatB, DNA gyrase, HDAC7, rHA, RNR, TrxR, TS and Top II) as investigated by docking calculations.

Synthesis, Characterization and X-Ray Crystal Structure of the New Schiff Base and Anticandidal Evaluation

2019 ◽  
Vol 41 (6) ◽  
pp. 1090-1090
Author(s):  
Mehmet Poyraz Mehmet Poyraz ◽  
Musa Sari Musa Sari ◽  
Halil Berber Halil Berber ◽  
Nursenem Karaca and Fatih Demirci Nursenem Karaca and Fatih Demirci
Keyword(s):  
Schiff Base ◽  
Spectroscopic Techniques ◽  
X Ray Diffraction ◽  
X Ray ◽  
Microdilution Method ◽  
Broth Microdilution Method ◽  
Ft Ir ◽  
Anticandidal Activity ◽  
Crystal Structural

A new Schiff base, namely 2-methoxy-6-((2-(4 nitrophenyl) hydrazineylidene) methyl)phenol was synthesized and characterized by melting points, elemental analysis, thermogravimetric analysis and spectroscopic techniques (FT-IR, 1H-NMR and UV-VIS spectra). The chemical structure of compound was further confirmed by single crystal structural X-ray diffraction. The Schiff base is crystallized in the triclinic space group P-1. In the crystal, molecules are linked by O-H…O hydrogen bonds between the hydroxy “-O-” atom and the methoxy “-O-” atom. Furthermore, the synthesized Schiff base was tested for the in vitro anticandidal activities using CLSI broth microdilution method against human pathogenic Candida albicans, C. parapsilosis and C. krusei standard strains. In the anticandidal activity test results, the new Schiff base was found to be effective at 1 mg/mL - 0.25 mg/mL concentrations. (The last line omitted) (The sentence marked in red will be deleted)

scholarly journals A series of Mn(i) photo-activated carbon monoxide-releasing molecules with benzimidazole coligands: synthesis, structural characterization, CO releasing properties and biological activity evaluation

RSC Advances ◽  
2019 ◽  
Vol 9 (36) ◽  
pp. 20505-20512 ◽  
Author(s):  
Mixia Hu ◽  
YaLi Yan ◽  
Baohua Zhu ◽  
Fei Chang ◽  
Shiyong Yu ◽  
...  
Keyword(s):  
Carbon Monoxide ◽  
Biological Activity ◽  
Activated Carbon ◽  
Fluorescence Spectroscopy ◽  
Single Crystal ◽  
Structural Characterization ◽  
X Ray Diffraction ◽  
X Ray ◽  
H Nmr ◽  
C Nmr

Five Mn(i) photo-activated carbon monoxide-releasing molecules were synthesized by reactions of MnBr(CO)5 with L1–L4, and characterized via single crystal X-ray diffraction, 1H-NMR, 13C-NMR, IR, UV-vis and fluorescence spectroscopy.

scholarly journals Synthesis, Crystal Structures, and Spectroscopic Characterization of Bis-aldehyde Monomers and Their Electrically Conductive Pristine Polyazomethines

Polymers ◽  
2019 ◽  
Vol 11 (9) ◽  
pp. 1498 ◽  
Author(s):  
Abdul Hafeez ◽  
Zareen Akhter ◽  
John F. Gallagher ◽  
Nawazish Ali Khan ◽  
Asghari Gul ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Spectroscopic Characterization ◽  
Spectroscopic Techniques ◽  
Conductivity Measurements ◽  
X Ray Diffraction ◽  
Electrically Conductive ◽  
X Ray ◽  
Vis Spectroscopy ◽  
Ft Ir

Bis-aldehyde monomers 4-(4′-formyl-phenoxy)benzaldehyde (3a), 3-methoxy-4-(4′-formyl-phenoxy)benzaldehyde (3b), and 3-ethoxy-4-(4′-formyl-phenoxy)benzaldehyde (3c) were synthesized by etherification of 4-fluorobenzaldehyde (1) with 4-hydroxybenzaldehyde (2a), 3-methoxy-4-hydroxybenzaldehyde (2b), and 3-ethoxy-4-hydroxybenzaldehyde (2c), respectively. Each monomer was polymerized with p-phenylenediamine and 4,4′-diaminodiphenyl ether to yield six poly(azomethine)s. Single crystal X-ray diffraction structures of 3b and 3c were determined. The structural characterization of the monomers and poly(azomethine)s was performed by FT-IR and NMR spectroscopic techniques and elemental analysis. Physicochemical properties of polymers were investigated by powder X-ray diffraction, thermogravimetric analysis (TGA), viscometry, UV–vis, spectroscopy and photoluminescence. These polymers were subjected to electrical conductivity measurements by the four-probe method, and their conductivities were found to be in the range 4.0 × 10−5 to 6.4 × 10−5 Scm−1, which was significantly higher than the values reported so far.

Microbial Transformation of Glycyrrhetinic Acid by Colletotrichum lini AS3.4486

2015 ◽  
Vol 1120-1121 ◽  
pp. 877-881
Author(s):  
Chao Jun He ◽  
Yu Min Yang ◽  
Kong Yang Wu
Keyword(s):  
Single Crystal ◽  
Microbial Transformation ◽  
Glycyrrhetinic Acid ◽  
Conversion Product ◽  
X Ray Diffraction ◽  
Orthorhombic Space Group ◽  
X Ray ◽  
H Nmr ◽  
Sole Product ◽  
C Nmr

The biotransformation of 18β-glycyrrhetinic acid by Colletotrichum lini AS3.4486 was investigated. The conversion reaction was carried out for 72h, and the sole product was isolated by column chromatography and elucidated as 7β,15α-dihydroxy-18β-glycyrrhetinic acid by HR-ESI-MS, 1H-NMR , 13C-NMR and single–crystal X-ray diffraction. The crystal of the conversion product belongs to orthorhombic, space group P212121 with 11.828(1), 13.213(2), 19.606(2) Å , V = 3064.0 Å3, Z = 4. This study povides a new method for the synthesis of 7β,15α-dihydroxy-18β-glycyrrhetinic acid.

β-Hydroxydithiozimtsäurederivate als Liganden. Synthese und Charakterisierung neuartiger 1,1-Ethendithiolato- und O,S-Chelatkomplexe / Derivatives of β -Hydroxydithiocinnamic Acids as Ligands. Syntheses and Characterisation of Novel 1,1-Ethenedithiolato and O,S-Chelate Complexes

2007 ◽  
Vol 62 (3) ◽  
pp. 475-482 ◽  
Author(s):  
Karsten Schubert ◽  
Helmar Görls ◽  
Wolfgang Weigand
Keyword(s):  
Bidentate Ligand ◽  
Molecular Structures ◽  
X Ray Diffraction ◽  
Chelate Complexes ◽  
X Ray ◽  
H Nmr ◽  
Hexyl Ester ◽  
Elemental Analyses ◽  
Derivatives Of ◽  
C Nmr

Starting from 4-bromoacetophenone 1, the 4-bromo-β -hydroxydithiocinnamic acid 2 and the 4-bromo-β -hydroxydithiocinnamic acid hexyl ester 3 were prepared using carbon disulfide and potassium-tert-butylate as a base. Acting as a ligand, the acid gives 1,1-ethenedithiolato complexes with (Ph3P)2Pt(II) (4a), (Et3P)2Pt(II) (4b), dppePt(II) (4c), (Ph3P)2Pd(II) (4d), dppePd(II) (4e), and dppeNi(II) (4f). In contrast to the acid, the deprotonated ester 3 forms a monoanionic bidentate ligand. [O,S] Complexes of Pt(II) (5a), Pd(II) (5b) and Ni(II) (5c) were obtained. All complexes have been fully characterised using 1H NMR, 13C NMR and 31P NMR spectroscopy, mass spectrometry, infrared spectroscopy and elemental analyses. The molecular structures of the complexes 4b and 5a - 5c were determined by X-ray diffraction analyses.

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