- Poly(azomethine-epoxy-ether) containing phenyl and etoxy moieties: synthesis, characterization and fluorescence property
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The design and synthesis of poly(azomethine-epoxy-ether) (PAZ-EP) containing epoxide moiety was described. The purpose of the research was the improvement of poly(azomethine-ether) containing epoxide by introduction of Schiff base moiety. PAZ-EP was synthesized using epichlorohydrin (EP). The structure of the Schiff base (SB) and PAZ-EP were verified by FT-IR, 1H-NMR, 13C-NMR and UV–Vis spectroscopic analyses. Further characterization was employed using photophysical, electrochemical and fluorescence (PL) measurements. Application of TGA and differential scanning calorimetry analyses revealed thermal stability and thus propose a thermal processibility, which makes them potential materials for many contemporary practices. The number of average molecular weight of polymer with a polydispersity index of 1.14 was found to be 6750?Da using a gel permeation chromatography instrument. The highest occupied–lowest unoccupied energy levels and electrochemical (Eg′) band gap values of PAZ-EP were determined by cyclic voltammetry (CV) measurement. Scanning electron microscopy (SEM) images were illustrated at different magnifications to study the morphologic property of PAZ-EP.
- Kolcu, Feyza,Kaya, ?smet
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- C2-Symmetric chiral diamine ligands for enantiomeric recognition of amino acid esters and mandelic acid by proton nmr titration method
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Two novel C2 -symmetric chiral diamines containing α-phenylethyl and α-(1-naphthyl)ethyl chiral subunits were prepared with quantitative yields. Enantiomeric recognition properties of these simple structured diamine ligands towards D- and L-amino acid est
- Aral, Hayriye,Aral, Tark,Colak, Mehmet,Ziyadanogullari, Berrin,Ziyadanogullari, Recep
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- Green synthesis of novel bis(hexahydro-1H-xanthene-1,8(2H)-diones) employing p-toluenesulfonic acid (p-TSA) as a solid acid catalyst
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Green synthesis of novel bis(hexahydro-1H-xanthene-1,8(2H)-diones) which are linked to aliphatic or aromatic spacers via ether or ester linkages were performed in good to excellent yields by the reaction of 5,5-dimethyl-1,3-cyclohexanedione with the appropriate bis-aldehydes using p-TSA as an organic acid solid catalyst. The reaction of the bis-aldehydes with barbituric acid or 1,3-dimethylbarbituric acid instead of 5,5-dimethyl-1,3-cyclohexanedione afforded the corresponding Knoevenagel condensation adducts in good yield.
- Darweesh, Ahmed F.,Salama, Soad K.,Abdelhamid, Ismail A.,Elwahy, Ahmed H. M.
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p. 471 - 484
(2020/10/30)
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- Multicomponent synthesis of new bis(pyranopyrazoles) and their antimicrobial–antioxidant evaluations
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One-pot, three-component reactions were utilized to obtain a series of new symmetrical bis(pyranopyrazoles) built around six rigid linkers in good yields and in the short durations under normal conditions. The structures of the prepared compounds were confirmed using their IR, 1H-NMR, 13C-NMR and ESI-MS spectral parameters. The bis(pyranopyrazoles) 3b and 3f exhibited significant antimicrobial action against Klebsiella pneumoniae, Fusarium oxysporum and Penicillium glabrum at a minimum inhibitory concentration (MIC) value of 3.12 μg mL-1, which is equivalent to the MIC of the standard drug. trans-Butene-linked bis(pyranopyrazole) 3f was also associated with a good radical scavenging activity similar to that of ascorbic acid (a standard antioxidant).
- Yusuf, Mohamad,Thakur, Saloni
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p. 119 - 128
(2019/05/15)
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- Y-shaped bis-arylethenesulfonic acid esters: Potential potent and membrane permeable protein tyrosine phosphatase 1B inhibitors
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Known PTP1B inhibitors with bis-anionic moieties exhibit potent inhibitory activity, good selectivity, however, they are incapable of penetrating cellular membranes. Based upon our finding of a new pharmacophoric group in inhibition of PTP1B and the struc
- Yang, Fengzhi,Xie, Fangzhou,Zhang, Ying,Xia, Yu,Liu, Wenlu,Jiang, Faqin,Lam, Celine,Qiao, Yixue,Xie, Dongsheng,Li, Jianqi,Fu, Lei
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supporting information
p. 2166 - 2170
(2017/04/27)
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- Novel PTP1B enzyme inhibitor, preparation method and applications thereof
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The present invention provides a novel PTP1B enzyme inhibitor, a preparation method and applications thereof, and particularly discloses a class of bis 2-substituted ethylene sulfonate compounds and a preparation method thereof, and uses of the bis 2-substituted ethylene sulfonate compounds as the PTP1B enzyme activity inhibitor. According to the present invention, the prepared novel compound has good PTP1B enzyme activity inhibition effect, and has the application value in preparation of drugs for treatment and prevention of diabetes and obesity.
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Paragraph 0111; 0120-0121
(2017/08/31)
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- Microwave assisted multi-component synthesis of novel bis(1,4-dihydropyridines) based arenes or heteroarenes
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A synthesis of novel bis-1,4-DHPs was reported. Two possible synthetic approaches for these compounds were investigated. In the first approach the monopodal 1,4-DHPs were used as building blocks for the construction of the target molecules via a simple al
- Sanad, Sherif M. H.,Kassab, Refaie M.,Abdelhamid, Ismail A.,Elwahy, Ahmed H. M.
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p. 910 - 924
(2016/07/06)
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- Synthesis, characterization, and antimicrobial studies of new rigid linker-based bispyrazolines
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The bispyrazolines 4a-4e were synthesized from the cyclization reaction of bischalcones 3a-3e with phenyl hydrazine by refluxing under alcoholic medium in the presence of glacial acetic acid. The bischalcones were obtained from the Claisen-Schmidt reactio
- Yusuf, Mohamad,Samdhian, Varsha,Jain, Payal
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p. 260 - 266
(2015/01/30)
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- Synthesis and antimicrobial studies of new N,N'-[5,5'-{2,2'-(bis-alkoxy) bis(2,1-phenylene)]bis(4-acetyl-4,5-dihydro-1,3,4-thiadiazole-5, 2-diyl)]diacetamide
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The bisthiadiazolines 4a(a'-f ') and 4b(a'-f ') built around the various rigid chains have been synthesized in good yields by refluxing bisthiosemicarbazones 3a(a'-f ') and 3b(a'-f ') in acetic anhydride medium. The reaction of bisaldehydes 2a(a'-f ') and
- Yusuf, Mohamad,Solanki, Indu,Jain, Payal
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experimental part
p. 703 - 715
(2012/09/07)
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- Synthesis of novel chiral Schiff-base ligands and their application in asymmetric nitro aldol (Henry) reaction
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Chiral Schiff-bases prepared from chiral amino alcohols catalyze the enantioselective Henry (nitro aldol) reaction between nitromethane and p-nitrobenzaldehyde in the presence of Cu(OTf)2 and Zn(OTf)2. Zn(OTf)2 promoted the reaction yield, while Cu(OTf)2 promoted the enantiomeric excess. The highest enantioselectivities were observed with ligand 3 (44% ee) and ligand 5 (47% ee).
- Colak, Mehmet,Aral, Tarik,Hosgoeren, Halil,Demirel, Nadir
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p. 1129 - 1133
(2008/02/09)
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- Synthesis and characterization of new organic phosphonates monomers as flame retardant additives for polymers
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Commercially available polyphenols react with diethylphosphite to give polyphosphonates, which are easily transformed by LDA in good yields to polyorthohydroxy aryl phosphonates. Moreover, some bis-benzyl aminobenzyl phosphonates have been prepared in good yields. These new monomers are of great relevance for the synthesis of thermal resistant polycondensates containing phosphonate moieties.
- Finocchiaro, Paolo,Consiglio, Giuseppe A.,Imbrogiano, Andrea,Failla, Salvatore
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p. 1689 - 1701
(2008/02/11)
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- Tether-directed selective synthesis of fulleropyrrolidine bisadducts
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Selective synthesis of C60 bisadducts has been achieved by using the Prato 1,3-dipolar cycloaddition of tethered bis-azomethine ylides. New bis(benzaldehydes) 1-4 tethered by a rigid linker were prepared and used to direct the second cycloaddit
- Zhou, Zhiguo,Schuster, David I.,Wilson, Stephen R.
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p. 1545 - 1551
(2007/10/03)
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- Dioxastilbenophanes - Synthesis and charge transfer complexation studies
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Intramolecular McMurry coupling of dialdehydes derived from xylenyl dibromide and 4-hydroxy benzaldehyde afforded cis-stilbenophanes along with cyclophane diols. Stilbenophanes with a large cavity were also synthesized. Charge transfer complexations of th
- Rajakumar, Perumal,Murali, Venghatraghavan
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p. 2351 - 2360
(2007/10/03)
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- Efficient synthesis of bolaform- and gemini-type alkyl-bis-[(α-amino)phosphonocarboxylic or phosphonic acid] surfactants
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The synthesis of a new series of bolaform- and gemini-type phosphorus acid surfactants is described. The Pudovik addition reaction of P-H bond tetraoxyspirophosphoranes to symmetrical, prochiral bis-imines bearing different more or less long and rigid linkers occurs instantaneously at room temperature. This reaction is diastereoselective and quantitatively leads to the corresponding alkyl-bis-[α-aminospirophosphoranes] in good to high diastereomeric ratio. Selective and one-pot hydrolysis of these P*-C* bond bis-spirophosphoranes can be readily achieved either at room temperature by moist solvents giving the corresponding alkyl-bis-[α-aminophosphonocarboxylic acid] amphiphiles, or by a more drastic reaction of 20% aqueous hydrochloric acid under reflux affording free alkyl-bis-[α-aminophosphonic acid] surfactants in good yields.
- Vercruysse-Moreira, Karine,Déjugnat, Christophe,Etemad-Moghadam, Guita
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p. 5651 - 5658
(2007/10/03)
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