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Journal articles on the topic '1-dicarboxylic ester'

Author: Grafiati

Published: 4 June 2021

Last updated: 19 February 2022

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1

Ghalia, Mohamed H., Mohamed Abd El-Hamid, Mohamed A. Zweil, Abd El-Galil E. Amr, and Shimaa A. Moafi. "Synthesis and Reactions of New Chiral Linear and Macrocyclic Tetraand Penta-peptide Candidates." Zeitschrift für Naturforschung B 67, no. 8 (2012): 806–18. http://dx.doi.org/10.5560/znb.2012-0116.

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9a A series of linear and macrocyclic pentapeptide derivatives have been prepared via the coupling of pyridine-2,6-dicarboxylic acid (1) or pyridine-2,6-dicarbonyl dichloride (2) with appropriate amino acid methyl esters. The coupling of 1or 2with aminoacid methyl esters gave the corresponding pyridine dipeptide methyl esters 3, which were hydrolyzed with sodium hydroxide to the corresponding acids 4. The latter compounds 4were coupled with other amino acid methyl esters to afford the corresponding tetrapeptide esters 5, which were hydrolyzed with sodium hydroxide to the corresponding acids 6.

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2

Kricheldorf, Hans R., and Thorsten Krawinkel. "LC Polyimides 30. Non-Crystalline Cholesteric Poly(Ester-Imide)s Based on Isosorbide and 1, 6-Bis(4-Carboxyphenoxy)Hexane." High Performance Polymers 9, no. 2 (1997): 105–20. http://dx.doi.org/10.1088/0954-0083/9/2/003.

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Numerous cholesteric copoly(ester-imide)s were prepared from tert.-butylhydroquinone and isosorbide, on the one hand, and from the acid chlorides of N-(4-carboxyphenyl)trimellitimide and 1, 6-bis(4-carboxyphenoxy)hexane on the other. Two polycondensation methods were applied and compared. The molar ratio of the diols was varied and also the molar ratio of hot dicarboxylic acid chlorides. The copoly(ester-imide)s formed Grandjean textures with a low content (5–10 mol%) of isosorbide and relatively high content of the flexible dicarboxylic acid. The glass transition temperatures ( Tgs) varied in

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3

Wolfe, Saul, Stephen Ro, Chan-Kyung Kim та Zheng Shi. "Synthesis and decarboxylation of Δ2-cephem-4,4-dicarboxylic acids". Canadian Journal of Chemistry 79, № 8 (2001): 1238–58. http://dx.doi.org/10.1139/v01-100.

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Penicillin V was converted in 14 steps into Δ2-cephems having hydrogen at C-3, hydrogen or ethyl at C-2, and two methoxycarbonyl, two benzyloxycarbonyl, or one methoxycarbonyl and one benzyloxycarbonyl substituent at C-4. Deprotection of these Δ2-cephem-4,4-dicarboxylic acid esters by alkaline hydrolysis (in the case of methyl esters) or hydrogenolysis (in the case of benzyl esters) led in all cases to rapid decarboxylation of the Δ2-cephem-4,4-dicarboxylic acid or Δ2-cephem-4,4-dicarboxylic acid monoester. With hydrogen at C-2, hydrolysis of the dimethyl ester with 1 equiv of base produced a

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4

Frampton, Christopher S., Michael W. Majchrzak, and John Warkentin. "Sense of sequential 1,5-sigmatropic rearrangements of dimethyl-3,3-dialkyl-3H-pyrazole-4,5-dicarboxylates. Crystal and molecular structures of two dimethyl-4,5-dialkyl-1H-pyrazole-1,3-dicarboxylates." Canadian Journal of Chemistry 69, no. 3 (1991): 373–78. http://dx.doi.org/10.1139/v91-057.

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3,3-Dialkyl-3H-pyrazole-4,5-dicarboxylic acid dimethyl esters (4), obtained by cycloaddition of R1R2C=N+=N− (R1 = R2 = CH3; R1 = CH3, R2 = CH2CH3) to CH3O2CC≡CCO2CH3, rearrange thermally by 1,5-sigmatropic alkyl shifts to both N and C. The latter rearrangement is followed by two successive 1,5-sigmatropic shifts of a methoxycarbonyl group. Final products of the threefold rearrangement were shown to be 4,5-dialkyl-1H-pyrazole-1,3-dicarboxylic acid dimethyl esters (6), rather than the isomeric 3,4-dialkyl-1H-pyrazole-1,5-dicarboxylic acid dimethyl esters (7), by means of single crystal X-ray dif

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5

El-Sherif, Ahmed, Mohamed Shoukry, Ramadan El-Bahnasawy, and Dalia Ahmed. "Complex formation reactions of palladium(II)-1,3-diaminopropane with various biologically relevant ligands. Kinetics of hydrolysis of glycine methyl ester through complex formation." Open Chemistry 8, no. 4 (2010): 919–27. http://dx.doi.org/10.2478/s11532-010-0057-4.

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AbstractThe interaction of [Pd(DAP)(H2O)2]2+ (DAP = 1,3-diaminopropane) with some selected bio-relevant ligands, containing different functional groups, were investigated. The ligands used are dicarboxylic acids, amino acids, peptides and DNA constituents. Stoichiometry and stability constants of the complexes formed are reported at 25°C and 0.1 M ionic strength. The results show the formation of 1:1 complexes with amino acids and dicarboxylic acids. The effect of chelate ring size of the dicarboxylic acid complexes on their stability constants is examined. Peptides form both 1:1 complexes and

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6

Shoukry, Mohamed M., and Sameya M. T. Ezzat. "Palladium(II) Complexes Containing Mixed Nitrogen-Sulphur Donor Ligands: Interaction of [Pd(Methionine Methyl Ester)(H2O)2]2+with Biorelevant Ligands." Bioinorganic Chemistry and Applications 2014 (2014): 1–8. http://dx.doi.org/10.1155/2014/382646.

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Pd(MME)Cl2complex (MME = methionine methyl ester) was synthesised and characterized by physicochemical measurements. The reaction of [Pd(MME)(H2O)2]2+with amino acids, peptides, or dicarboxylic acids was investigated at 25°C and 0.1 M ionic strength. Amino acids and dicarboxylic acids form 1 : 1 complexes. Peptides form both 1 : 1 complexes and the corresponding deprotonated amide species. The stability of the complexes formed was determined and the binding centres of the ligands were assigned. Effect of solvent on the stability constant of Pd(MME)-CBDCA complex, taken as a representative exam

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7

Nyong, B., B. Jones, O. Ita, and P. Ita. "Antimicrobial Activity of Medicinal Compounds Produced by Fungal Degradation of Soybean Oil Using Lignocellulose Biomass as Surface." Journal of Basic and Applied Research in Biomedicine 7, no. 1 (2021): 32–34. http://dx.doi.org/10.51152/jbarbiomed.v7i1.212.

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Methyl esters were produced by fungal degradation of soybean oil using banana leaves as surface. Analysis of the products also revealed medicinal compounds (Benzyl Benzoate obtained from the banana leaves used as surface for the fungal degradation of the soybean oil and 1, 2-Benzene dicarboxylic acid dioctyl ester obtained from the soybean oil impurities). Microorganism activity test was carried out on the medicinal compounds to confirm their antibacterial and antifungal activity. The result showed that both had antibacterial and antifungal activity as shown by the zones of inhibition and as a

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8

Elix, JA, R. Naidu, and JR Laundon. "A Synthesis of the Lichen Dibenzofuran Pannaric Acid 2-Methyl Ester and Its Isomer 3-O-Methylpannaric Acid." Australian Journal of Chemistry 45, no. 4 (1992): 785. http://dx.doi.org/10.1071/ch9920785.

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A total synthesis of pannaric acid 2-methyl ester (2-methyl hydrogen 3,9-dihydroxy-1,7-dimethyldibenzofuran-2,6-dicarboxylae) (1) and 3-O-methylpannaric acid (9-hydroxy- 3-methoxy-1,7-dimethyldibemofuran-2,6-dicarboxylic acid) (2) has been achieved through a biomimetic-type approach by using palladium(n) acetate in the key cyclization step. The acid (1) was shown to be identical to a major metabolite of the lichen Roccella capensis and a minor or trace constituent of the lichens Leproloma diffusum and L. vouauxii.

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9

Lin, Shao Jian, Si Chen, Jian Wu Lan, et al. "Research on Low Temperature Elastic Recovery Property of a Novel Poly(ester-Imide-Ether) Based on N-(4-Carboxyphenyl) Trimellitimide Unit." Advanced Materials Research 554-556 (July 2012): 122–25. http://dx.doi.org/10.4028/www.scientific.net/amr.554-556.122.

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The elastic recovery property of a novel poly(ester-imide-ether) (PEIE) was prepared from the 1, 4-butanediol (BD), poly(tetramethylene glycol) (PTMG1000) and imide dicarboxylic acid based on 1, 2, 4-benzenetricarboxylic (TMA) and aminobenzoic acid (PABA) was studied. The elastic recovery of the PEIE was studied in the fiber form. The influences of the draw ratio, temperature and heat treatment on elastic recovery were investigated. The results show that the novel PEIE possesses the excellent elastic recovery at low temperature and the quickly-changed temperature is lower than that of traditio

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10

Kim, Geon-Soo, Eunkee Hong, and Sang Chul Shim. "Photolysis of 3-phenyl-4-phenylethynylcyclobut-3-en-trans-1, 2-dicarboxylic acid dimethyl ester in methanol." Journal of Photochemistry and Photobiology A: Chemistry 101, no. 1 (1996): 39–44. http://dx.doi.org/10.1016/s1010-6030(96)04421-8.

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11

KUROYAN, R. A., S. A. POGOSYAN, N. P. GRIGORYAN, et al. "ChemInform Abstract: Synthesis and Structure of 2-Oxo-1-oxaspiro(4,5)decane-3,4- dicarboxylic Acid Diethyl Ester." ChemInform 23, no. 7 (2010): no. http://dx.doi.org/10.1002/chin.199207151.

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12

Murad, Ary R., Ahmed Iraqi, Shujahadeen B. Aziz, Mohammed S. Almeataq, Sozan N. Abdullah, and Mohamad A. Brza. "Characteristics of Low Band Gap Copolymers Containing Anthracene-Benzothiadiazole Dicarboxylic Imide: Synthesis, Optical, Electrochemical, Thermal and Structural Studies." Polymers 13, no. 1 (2020): 62. http://dx.doi.org/10.3390/polym13010062.

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Two novel low band gap donor–acceptor (D–A) copolymers, poly[9,10-bis(4-(dodecyloxy)phenyl)-2,6-anthracene-alt-5,5-(4′,7′-bis(2-thienyl)-2′,1′,3′-benzothiadiazole-N-5,6-(3,7-dimethyloctyl)dicarboxylic imide)] (PPADTBTDI-DMO) and poly[9,10-bis(4-(dodecyloxy)phenyl)-2,6-anthracene-alt-5,5-(4′,7′-bis(2-thienyl)-2′,1′,3′-benzothiadiazole-5,6-N-octyl-dicarboxylic imide)] (PPADTBTDI-8) were synthesized in the present work by copolymerising the bis-boronate ester of 9,10-phenylsubstituted anthracene flanked by thienyl groups as electron–donor units with benzothiadiazole dicarboxylic imide (BTDI) as e

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13

Alfonso, Montserrat, and Helen Stoeckli-Evans. "Dimethyl and diethyl esters of 5,6-bis(pyridin-2-yl)pyrazine-2,3-dicarboxylic acid: a comparison." Acta Crystallographica Section E Crystallographic Communications 72, no. 2 (2016): 233–37. http://dx.doi.org/10.1107/s2056989016001080.

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In dimethyl 5,6-bis(pyridin-2-yl)pyrazine-2,3-dicarboxylate, C18H14N4O4, (I), and diethyl 5,6-bis(pyridin-2-yl)pyrazine-2,3-dicarboxylate, C20H18N4O4, (II), the dimethyl and diethyl esters of 5,6-bis(pyridin-2-yl)pyrazine-2,3-dicarboxylic acid, the orientation of the two pyridine rings differ. In (I), pyridine ringBis inclined to pyrazine ringAby 44.8 (2)° and the pyridine and pyrazine N atoms aretransto one another, while pyridine ringCis inclined to the pyrazine ring by 50.3 (2)°, with the pyridine and pyrazine N atomscisto one another. In compound (II), the diethyl ester, which possesses tw

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14

Strunz, George M., and Li Ya. "2,2-Dimethylsuccinic acid derivatives in isoprenoid synthesis: a 2,2-dimethylvinyl anion equivalent in the synthesis of ar-atlantone, ar-turmerone, and prenylated aromatic compounds." Canadian Journal of Chemistry 70, no. 5 (1992): 1317–22. http://dx.doi.org/10.1139/v92-169.

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The anion of methyl 2,2-dimethylsuccinate was alkylated with benzylic bromides to give the corresponding 3-substituted-2,2-dimethylsuccinates. Hydrolysis to the dicarboxylic acids, followed by bisdecarboxylation with lead tetraacetate, afforded 1-aryl-3-methyl-2-butenes, which are model prenylated aromatic compounds. Acylation of methyl 2,2-dimethylsuccinate with E-3-(4′-methylphenyl) crotonyl chloride gave the substituted succinate 9. Hydrolysis of the ester groups and acid-catalyzed decarboxylation of the resulting β-ketoacid produced the keto acid 10, which was decarboxylated by the Kochi m

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15

Lohaus, Edith, Claudia Zenger, Wolfhart Rüdiger та Edmund Cmiel. "Natural Inhibitors of Germination and Growth, III New α-Pyrones from Seeds of Rosa canina". Zeitschrift für Naturforschung C 40, № 7-8 (1985): 490–95. http://dx.doi.org/10.1515/znc-1985-7-806.

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Abstract The new α-pyrone derivative II was isolated in crystalline form from extracts of dormant seeds of Rosa canina. It inhibits germination of seeds of Amaranthus caudatus completely, but reversibly, at conc. > 2.5 × 10-5 м . Its chemical structure was elucidated by mass spectrometry, 1H-and 13C-NMR spectroscopy to be 3-methyl-1-oxa-bicyclo (4,1,0) hept-5-en-2-one-4,6-dicarboxylic acid dimethylester (II). It is derived from 3-methyl-2H-pyran-2-one-4,6-dicarboxylic acid by cyclo-propanation with diazomethane. The parent compound which is a natural product of the seeds of Rosa canina was

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16

Seibel, Harry, Penny L. Miner, Peter Norris та Timothy R. Wagner. "Crystal structure of 1-(2,3:5,6-Di-O-isopropylidene-β-D-mannofuranosyl)-1H-[1,2,3]triazol-4,5-dicarboxylic acid diethyl ester". Journal of Chemical Crystallography 37, № 3 (2007): 157–63. http://dx.doi.org/10.1007/s10870-007-9178-9.

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17

Brown, RFC, KJ Coulston, FW Eastwood, and MP Hill. "Synthesis of Precursors Suitable for Pyrolytic Fragmentation to Pentatetraenone." Australian Journal of Chemistry 41, no. 2 (1988): 215. http://dx.doi.org/10.1071/ch9880215.

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Reaction of 2-phenylselenopropanoyl chloride with methyl ( triphenylphosphoranylidene ) ethanoate yielded methyl 4- phenylselenopenta-2,3-dienoate (3). Distillation of the ester (3) gave dimethyl (E,E)-3′,4′-dimethylcyclobut-3′-ene-1′,2′- diylidenebisethanoate (5) and oxidation of (3) with potassium peroxymonosulfate yielded methyl 2-oxopent-3-ynoate (8). The ester (3) with cyclopentadiene at 160-180° gave a Diels-Alder adduct methyl 3- (1′-phenylselenoethylidene) bicyclo [2.2.1]hept-5-ene-2-carboxylate (4) as a mixture of four isomers. Treatment of the mixture with lithium diisopropylamide an

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18

Schaffert, Alexandra, Josi Arnold, Isabel Karkossa, Matthias Blüher, Martin von Bergen, and Kristin Schubert. "The Emerging Plasticizer Alternative DINCH and Its Metabolite MINCH Induce Oxidative Stress and Enhance Inflammatory Responses in Human THP-1 Macrophages." Cells 10, no. 9 (2021): 2367. http://dx.doi.org/10.3390/cells10092367.

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The use of the plasticizer bis(2-ethylhexyl)phthalate (DEHP) and other plasticizers in the manufacture of plastic products has been restricted due to adverse health outcomes such as obesity, metabolic syndrome, and asthma, for which inflammation has been described to be a driving factor. The emerging alternative plasticizer 1,2-cyclohexanedioic acid diisononyl ester (DINCH) still lacks information regarding its potential effects on the immune system. Here, we investigated the effects of DINCH and its naturally occurring metabolite monoisononylcyclohexane-1,2-dicarboxylic acid ester (MINCH) on

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19

Furuyama, Taniyuki, Daiki Noguchi, Yuta Suzuki, and Nagao Kobayashi. "Synthesis and characterization of aza-bridged thiophene–pyrrole dyads and their isomers." Canadian Journal of Chemistry 92, no. 8 (2014): 765–70. http://dx.doi.org/10.1139/cjc-2014-0039.

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Aza-bridged thiophene-pyrrole dyads were synthesized and characterized. Thiophenes substituted with electron-withdrawing groups (EWGs) were used as building blocks for the framework. However, an unprecedented cyclization occurred, and a thieno[2,3-d]pyrimidine derivative (4) was obtained in the reaction between 2,5-diamino-3,4-dicyanothiophene (1) and 3,5-diiminoisoindoline (3), whereas the reaction between 2,5-diamino-3,4-dicarboxylic acid ethyl ester (2) and 3 produced the desired dyad (5). The structures of 4 and 5 were unambiguously characterized by X-ray diffraction. Compound 5 is the fir

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20

Shapiro, E. A., M. N. Protopopova, and O. M. Nefedov. "Stereospecific catalytic dimerization of the methyl ester of 1-pentylcyclopropene-3-carboxylic acid to the dimethyl ester of Z,E,Z-2,5-dipentyl-1,3,5-hexatriene-1,6-dicarboxylic acid." Bulletin of the Academy of Sciences of the USSR Division of Chemical Science 36, no. 1 (1987): 215. http://dx.doi.org/10.1007/bf00953895.

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21

Napitupulu, Mery, Geoffrey A. Lawrance, Guy J. Clarkson, and Peter Moore. "Methyl 2-[N-(2′-Pyridylmethyl)carbamyl]pyridine-6-carboxylate: A Precursor for Unsymmetrical Diamide Ligands." Australian Journal of Chemistry 59, no. 11 (2006): 796. http://dx.doi.org/10.1071/ch06310.

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Methyl 2-[N-(2′-pyridylmethyl)carbamyl]pyridine-6-carboxylate (H1), prepared by reaction of a 1:1 ratio of the methyl diester of pyridine-2,6-dicarboxylic acid and 2-aminomethylpyridine, can form 1:2 M:L complexes by acting as a tridentate ligand, as exemplified by a crystal structure analysis of [CoIII(1)2](ClO4) where each ligand is coordinated by the amido group and its two flanking pyridine groups, with the ester group, a relatively poor donor, remaining unbound. The acid formed upon ester hydrolysis, hydrogen 2-[N-(2′-pyridylmethyl)carbamyl]pyridine-6-carboxylate (H22), has been isolated

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22

Schomberg, Stacey L., Gui Su, Robert A. Haworth, and Dandan Sun. "Stimulation of Na-K-2Cl Cotransporter in Neurons by Activation of Non-NMDA Ionotropic Receptor and Group-I mGluRs." Journal of Neurophysiology 85, no. 6 (2001): 2563–75. http://dx.doi.org/10.1152/jn.2001.85.6.2563.

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In a previous study, we found that Na+-K+-2Cl−cotransporter in immature cortical neurons was stimulated by activation of the ionotropic N-methyl-d-aspartate (NMDA) glutamate receptor in a Ca2+-dependent manner. In this report, we investigated whether the Na+-K+-2Cl−cotransporter in immature cortical neurons is stimulated by non-NMDA glutamate receptor–mediated signaling pathways. Expression of the Na+-K+-2Cl−cotransporter and metabotropic glutamate receptors (mGluR1 and 5) was detected in cortical neurons via immunoblotting and immunofluorescence staining. Significant stimulation of cotranspor

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23

Ketema, Asnake, and Amare Worku. "Review on Intermolecular Forces between Dyes Used for Polyester Dyeing and Polyester Fiber." Journal of Chemistry 2020 (November 8, 2020): 1–7. http://dx.doi.org/10.1155/2020/6628404.

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Polyester fiber is a manufactured fiber composed of synthetic linear macromolecules in the chain at least 85% by mass of an ester of diol and benzene-1, 4-dicarboxylic acid (terephthalic acid). Fibers of the most common polyester, poly(ethylene terephthalate) (PET or PET), are generally made from either terephthalic acid or dimethyl terephthalate together with ethylene glycol. Dyeing of polyester fabric with disperse dyes, polyester requires the use of dispersing agents. The chemical characteristics and general application conditions of disperse dyes are characterized by the absence of solubil

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24

Boldrini, Gian Paolo, Luisa Lodi, Emilio Tagliavini, Claudio Trombini, and Achille Umani-Ronchi. "Asymmetric aldol reactions using (4R-trans)-2-(1-methyl- ethenyl)-1,3,2-dioxaborolane-4,5-dicarboxylic acid, bis-ethyl ester, a chiral precursor of the acetone enolate." Journal of Organometallic Chemistry 336, no. 1-2 (1987): 23–28. http://dx.doi.org/10.1016/0022-328x(87)87154-1.

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25

Juchaux, F., T. Sellathurai, V. Perrault, et al. "A combination of pyridine‐2, 4‐dicarboxylic acid diethyl ester and resveratrol stabilizes hypoxia‐inducible factor 1‐alpha and improves hair density in female volunteers." International Journal of Cosmetic Science 42, no. 2 (2020): 167–73. http://dx.doi.org/10.1111/ics.12600.

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26

S. Hifnawy, Mohamed, Hossam M. Hassan, Rabab Mohammed, et al. "Induction of Antibacterial Metabolites by Co-Cultivation of Two Red-Sea-Sponge-Associated Actinomycetes Micromonospora sp. UR56 and Actinokinespora sp. EG49." Marine Drugs 18, no. 5 (2020): 243. http://dx.doi.org/10.3390/md18050243.

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Liquid chromatography coupled with high resolution mass spectrometry (LC-HRESMS)-assisted metabolomic profiling of two sponge-associated actinomycetes, Micromonospora sp. UR56 and Actinokineospora sp. EG49, revealed that the co-culture of these two actinomycetes induced the accumulation of metabolites that were not traced in their axenic cultures. Dereplication suggested that phenazine-derived compounds were the main induced metabolites. Hence, following large-scale co-fermentation, the major induced metabolites were isolated and structurally characterized as the already known dimethyl phenazi

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Selvakumar, Jemimah Naine, Subathra Devi Chandrasekaran, George Priya C. Doss, and Thirumal D. Kumar. "Inhibition of the ATPase Domain of Human Topoisomerase IIa on HepG2 Cells by 1, 2-benzenedicarboxylic Acid, Mono (2-ethylhexyl) Ester: Molecular Docking and Dynamics Simulations." Current Cancer Drug Targets 19, no. 6 (2019): 495–503. http://dx.doi.org/10.2174/1568009619666181127122230.

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Background: The major attention has been received by the natural products in the prevention of diseases due to their pharmacological role. Objective: The major focus of the study was to search for highly potential anti-cancer compounds from marine Streptomyces sp. VITJS4 (NCIM No. 5574). Methods: Cytotoxic assay was examined by MTT assay on HepG2 cells. Bioassay-guided fractionation of the ethyl acetate extract from the fermented broth led to the isolation of the compound. The lead compound structure was elucidated by combined NMR and MS analysis, and the absolute configuration was assigned by

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Gill, Iqbal, and Ramesh Patel. "Biocatalytic ammonolysis of (5S)-4,5-dihydro-1H-pyrrole-1,5-dicarboxylic acid, 1-(1,1-dimethylethyl)-5-ethyl ester: Preparation of an intermediate to the dipeptidyl peptidase IV inhibitor Saxagliptin." Bioorganic & Medicinal Chemistry Letters 16, no. 3 (2006): 705–9. http://dx.doi.org/10.1016/j.bmcl.2005.10.021.

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Kawamura, K., E. Tachibana, K. Okuzawa, S. G. Aggarwal, Y. Kanaya та Z. F. Wang. "High abundances of water-soluble dicarboxylic acids, ketocarboxylic acids and α-dicarbonyls in the mountain aerosols over the North China Plain during wheat burning season". Atmospheric Chemistry and Physics Discussions 13, № 2 (2013): 3695–734. http://dx.doi.org/10.5194/acpd-13-3695-2013.

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Abstract. Aerosol (TSP) samples were collected at the summit of Mount Tai (elevation: 1534 m a.s.l., 36.25° N; 117.10° E) located in the North China Plain using a high-volume air sampler and pre-combusted quartz filters. Sampling was conducted on day/night or 3 h basis in the period from 29 May to 28 June 2006 during the field burning of wheat straw residue and the post-burning season. The filter samples were analyzed for low molecular weight dicarboxylic acids, ketoacids and α-dicarbonyls using capillary gas chromatography (GC) and GC-MS employing water extraction and butyl ester derivatizati

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Rajić, Zrinka, Maja Beus, Hana Michnová, et al. "Asymmetric Primaquine and Halogenaniline Fumardiamides as Novel Biologically Active Michael Acceptors." Molecules 23, no. 7 (2018): 1724. http://dx.doi.org/10.3390/molecules23071724.

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Novel primaquine (PQ) and halogenaniline asymmetric fumardiamides 4a–f, potential Michael acceptors, and their reduced analogues succindiamides 5a–f were prepared by simple three-step reactions: coupling reaction between PQ and mono-ethyl fumarate (1a) or mono-methyl succinate (1b), hydrolysis of PQ-dicarboxylic acid mono-ester conjugates 2a,b to corresponding acids 3a,b, and a coupling reaction with halogenanilines. 1-[bis(Dimethylamino)methylene]-1H-1,2,3-triazolo[4,5-b]pyridinium 3-oxide hexafluorophosphate (HATU) was used as a coupling reagent along with Hünig′s base. Compounds 4 and 5 wer

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WAFFORD, K. A., and D. B. SATTELLE. "L-Glutamate Receptors on the Cell Body Membrane of an Identified Insect Motor Neurone." Journal of Experimental Biology 144, no. 1 (1989): 449–62. http://dx.doi.org/10.1242/jeb.144.1.449.

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Current-clamp experiments on an identified neurone have demonstrated the presence of L-glutamate receptors in the insect central nervous system. The cell body of the fast coxal depressor motor neurone (Df) in the metathoracic ganglion of the cockroach Periplaneta americana exhibits a hyperpolarizing response to L-glutamate, accompanied by an increase in membrane conductance. The response is dependent on both intracellular and extracellular chloride concentration, but is not affected by changes in potassium concentration. The hyperpolarization reverses at −82mV (the equilibrium potential for ch

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Dibrivnyi, V. N., N. A. Butylina, V. V. Kochubei, Yu Ya Van-Chin-Syan, and A. P. Yuvchenko. "The thermodynamic properties and thermolysis characteristics of 2,5-dimethyl-2,5-di-(m-carboranoylperoxy)-3-hexine and 1,1-dimethyl-2-propine-1-yl diperoxy ester of m-carborane-1,7-dicarboxylic acid." Russian Journal of Physical Chemistry 80, no. 1 (2006): 42–46. http://dx.doi.org/10.1134/s0036024406010055.

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33

Tschank, G., D. G. Brocks, K. Engelbart, et al. "Inhibition of prolyl hydroxylation and procollagen processing in chick-embryo calvaria by a derivative of pyridine-2,4-dicarboxylate. Characterization of the diethyl ester as a proinhibitor." Biochemical Journal 275, no. 2 (1991): 469–76. http://dx.doi.org/10.1042/bj2750469.

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The biochemical and morphological consequences of procollagen prolyl 4-hydroxylase inhibition by pyridine-2,4-dicarboxylic acid (2,4-PDCA) and its diethyl ester (diethyl-2,4-PDC) were studied in chick-embryo calvaria, which predominantly synthesize type I collagen. Half-maximal inhibition of tissue hydroxyproline formation required 650 microM-2,4-PDCA, whereas the Ki with respect to chicken prolyl 4-hydroxylase in vitro was 2 microM. In contrast, half-maximal inhibition was caused by 10 microM-diethyl-2,4-PDC in the intact calvaria, although chicken prolyl 4-hydroxylase in vitro was not inhibi

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34

Sung, Ki-Wug, Sukwoo Choi, and David M. Lovinger. "Activation of Group I mGluRs Is Necessary for Induction of Long-Term Depression at Striatal Synapses." Journal of Neurophysiology 86, no. 5 (2001): 2405–12. http://dx.doi.org/10.1152/jn.2001.86.5.2405.

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Activation of metabotropic glutamate receptors (mGluRs), which are coupled to G proteins, has important roles in certain forms of synaptic plasticity including corticostriatal long-term depression (LTD). In the present study, extracellular field potential and whole cell voltage-clamp recording techniques were used to investigate the effect of mGluR antagonists with different subtype specificity on high-frequency stimulation (HFS)-induced LTD of synaptic transmission in the striatum of brain slices obtained from 15-to 25-day-old rats. Induction of LTD was prevented during exposure to the nonsel

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Kawamura, K., E. Tachibana, K. Okuzawa, S. G. Aggarwal, Y. Kanaya та Z. F. Wang. "High abundances of water-soluble dicarboxylic acids, ketocarboxylic acids and α-dicarbonyls in the mountaintop aerosols over the North China Plain during wheat burning season". Atmospheric Chemistry and Physics 13, № 16 (2013): 8285–302. http://dx.doi.org/10.5194/acp-13-8285-2013.

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Abstract. Aerosol (TSP) samples were collected at the summit of Mount Tai (elevation: 1534 m a.s.l., 36.25° N, 117.10° E) located in the North China Plain using a high-volume air sampler and pre-combusted quartz filters. Sampling was conducted on day/night or 3 h basis in the period from 29 May to 28 June 2006 during the field burning of wheat straw residue and the post-burning season. The filter samples were analyzed for low-molecular-weight dicarboxylic acids, ketoacids and α-dicarbonyls using capillary gas chromatography (GC) and GC-MS employing water extraction and butyl ester derivatizati

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36

Metzger, Friedrich, Anna Kulik, Michael Sendtner, and Klaus Ballanyi. "Contribution of Ca2+-Permeable AMPA/KA Receptors to Glutamate-Induced Ca2+ Rise in Embryonic Lumbar Motoneurons In Situ." Journal of Neurophysiology 83, no. 1 (2000): 50–59. http://dx.doi.org/10.1152/jn.2000.83.1.50.

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Intracellular Ca2+([Ca2+]i) was fluorometrically measured with fura-2 in lumbar motoneurons of acutely isolated spinal cord slices from embryonic rats. In ester-loaded cells, bath-applied glutamate (3 μM to 1 mM) evoked a [Ca2+]i increase by up to 250 nM that was abolished by 6-cyano-7-nitroquinoxaline-2,3-dione (CNQX) plus 2-amino-5-phosphonovalerate (APV). CNQX or APV alone reduced the response by 82 and 25%, respectively. The glutamatergic agonists kainate (KA), quisqualate (QUI), and S-α-amino-3-hydroxy-5-methyl-4-isoxalone (S-AMPA) evoked a similar [Ca2+]i transient as glutamate. N-methyl

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37

Prosyanik, A. V., S. V. Bondarenko, S. V. Loban', and V. I. Markov. "1-Substituted aziridine-2,2-dicarboxylic acid esters." Chemistry of Heterocyclic Compounds 21, no. 3 (1985): 285–91. http://dx.doi.org/10.1007/bf00506667.

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38

Grover, Lawrence M., and Chen Yan. "Evidence for Involvement of Group II/III Metabotropic Glutamate Receptors in NMDA Receptor–Independent Long-Term Potentiation in Area CA1 of Rat Hippocampus." Journal of Neurophysiology 82, no. 6 (1999): 2956–69. http://dx.doi.org/10.1152/jn.1999.82.6.2956.

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Previous studies implicated metabotropic glutamate receptors (mGluRs) in N-methyl-d-aspartate (NMDA) receptor–independent long-term potentiation (LTP) in area CA1 of the rat hippocampus. To learn more about the specific roles played by mGluRs in NMDA receptor–independent LTP, we used whole cell recordings to load individual CA1 pyramidal neurons with a G-protein inhibitor [guanosine-5′-O-(2-thiodiphosphate), GDPβS]. Although loading postsynaptic CA1 pyramidal neurons with GDPβS significantly reduced G-protein dependent postsynaptic potentials, GDPβS failed to prevent NMDA receptor– independent

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39

Kim, Juhan, Dohyun Kyung, Hyungdon Yun та ін. "Cloning and Characterization of a Novel β-Transaminase from Mesorhizobium sp. Strain LUK: a New Biocatalyst for the Synthesis of Enantiomerically Pure β-Amino Acids". Applied and Environmental Microbiology 73, № 6 (2007): 1772–82. http://dx.doi.org/10.1128/aem.02119-06.

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ABSTRACT A novel β-transaminase gene was cloned from Mesorhizobium sp. strain LUK. By using N-terminal sequence and an internal protein sequence, a digoxigenin-labeled probe was made for nonradioactive hybridization, and a 2.5-kb gene fragment was obtained by colony hybridization of a cosmid library. Through Southern blotting and sequence analysis of the selected cosmid clone, the structural gene of the enzyme (1,335 bp) was identified, which encodes a protein of 47,244 Da with a theoretical pI of 6.2. The deduced amino acid sequence of the β-transaminase showed the highest sequence similarity

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40

Liu, F., F. Duan, K. He, Y. Ma, K. A. Rahn, and Q. Zhang. "An enhanced procedure for measuring organic acids and methyl esters in PM<sub>2.5</sub>." Atmospheric Measurement Techniques Discussions 8, no. 3 (2015): 2379–407. http://dx.doi.org/10.5194/amtd-8-2379-2015.

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Abstract. We have developed an enhanced analytical procedure to measure organic acids and methyl esters in fine aerosol with much greater specificity and sensitivity than previously available. This capability is important because of these species and their low concentrations, even in highly polluted atmospheres like Beijing, China. The procedure first separates the acids and esters from the other organic compounds with anion-exchange solid- phase extraction (SPE), then, quantifies them by gas chromatography coupled with mass spectrometry. This allows us to accurately quantify the C4-C11 dicarb

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Zhang, Wen-Zhen, Ming-Wang Yang, Xu-Tong Yang, Ling-Long Shi, Hui-Bo Wang, and Xiao-Bing Lu. "Double carboxylation of o-alkynyl acetophenone with carbon dioxide." Organic Chemistry Frontiers 3, no. 2 (2016): 217–21. http://dx.doi.org/10.1039/c5qo00374a.

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A copper-catalyzed double carboxylation of o-alkynyl acetophenone using carbon dioxide via a carboxylation/intramolecular cyclization/second carboxylation sequence to afford 1(3H)-isobenzofuranylidene dicarboxylic esters in good yields is developed.

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42

Pihera, Pavel, Hana Dvořáková, and Jiří Svoboda. "Diels-Alder Reactions of Vinyl Derivatives of [1]Benzothieno[3,2-b]furan." Collection of Czechoslovak Chemical Communications 64, no. 2 (1999): 389–407. http://dx.doi.org/10.1135/cccc19990389.

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2-Vinyl- (2) and 3-vinyl[1]benzothieno[3,2-b]furan (3) react with dimethyl acetylenedicarboxylate, methyl propiolate, maleic anhydride, or acrylonitrile endo-selectively as dienes to afford new [1]benzothieno[3,2-b][1]benzofuran derivatives 7-20. cis-Anhydrides 13 and 18 were transformed into dimethyl esters 21 and 22, respectively. It was shown that the base-catalyzed hydrolysis of 13 and 18 is accompanied by rearrangement of double bond in 13 and cis/trans isomerization of carboxylic group. Diesters 21 and 22, and nitriles 20 and 24 were aromatized by treatment with 2,3-dichloro-5,6-dicyano-

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43

Moskalenko, A. S., A. V. Prosyanik, and R. G. Kostyanovskii. "Improved method for the synthesis of 1-alkoxyaziridine-2,2-dicarboxylic acid esters." Chemistry of Heterocyclic Compounds 26, no. 8 (1990): 952. http://dx.doi.org/10.1007/bf00480880.

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44

Wasfy, A. A. F. "Fused Heterocycles. Part I. Synthesis of Some Annelated 1,2,4-Triazole Systems from [4-(1H-Benzimidazol-2-yl)-Phthalazin-1-Yl]Hydrazine." Journal of Chemical Research 2003, no. 8 (2003): 457–58. http://dx.doi.org/10.3184/030823403103174786.

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Substituted 6-(1 H-benzimidazol-2-yl)-[1,2,4]triazolo[3,4- a]phthalazine derivatives containing alkyl, aryl, hydroxyl, mercapto, methylthio and formyl substituents at position 3 have been synthesised. Di-[6-(1 H-benzimidazol-2-yl)-3-[1,2,4]triazolo[3,4- a]phthalazin-3-yl]alkanes have been obtained by the use of dicarboxylic acids or their esters in the above condensations. Methylation reactions of the triazolo-phthalazine system are reported.

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45

Liu, F., F. K. Duan, K. B. He, Y. L. Ma, K. A. Rahn, and Q. Zhang. "An enhanced procedure for measuring organic acids and methyl esters in PM<sub>2.5</sub>." Atmospheric Measurement Techniques 8, no. 11 (2015): 4851–62. http://dx.doi.org/10.5194/amt-8-4851-2015.

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Abstract. A solid-phase extraction (SPE) pretreatment procedure allowing organic acids to be separated from methyl esters in fine aerosol has been developed. The procedure first separates the organic acids from fatty acid methyl esters (FAMEs) and other nonacid organic compounds by aminopropyl-based SPE cartridge and then quantifies them by gas chromatography/mass spectrometry. The procedure prevents the fatty acids and dimethyl phthalate from being overestimated, and so allows us to accurately quantify the C4–C11 dicarboxylic acids (DCAs) and the C8–C30 monocarboxylic acids (MCAs). Results fo

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46

Mézlová, Marie, Hana Petříčková, Petr Maloň, Václav Kozmík, and Jiří Svoboda. "Axially Chiral 3,3'-Bi(1-benzothiophene)-2,2'-dicarboxylic Acid and Its Derivatives." Collection of Czechoslovak Chemical Communications 68, no. 5 (2003): 1020–38. http://dx.doi.org/10.1135/cccc20031020.

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Ullmann dimerization of substituted methyl 3-X-1-benzothiophene-2-carboxylates 1-7 (X = Cl, Br) gave rise to the corresponding dimeric 3,3'-bi(1-benzothiophene) esters 8-13. Resolution of the title acid 20 by fractional crystallization of its mono- and bisquininium salt afforded pure (R)- and (S)-enantiomers, the optical purity and absolute configuration of which was confirmed by CD spectrometry and by X-ray crystallography. Ullmann dimerization of chiral oxazolines 23 and 24 derived from 2 proceeded without any diastereodifferentiation. Reduction of (R)- and (S)-20 afforded the corresponding

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47

More, Satish S., T. Krishna Mohan, Y. Sateesh Kumar, U. K. Syam Kumar, and Navin B. Patel. "Synthesis of novel 5-alkyl/aryl/heteroaryl substituted diethyl 3,4-dihydro-2H-pyrrole-4,4-dicarboxylates by aziridine ring expansion of 2-[(aziridin-1-yl)-1-alkyl/aryl/heteroaryl-methylene]malonic acid diethyl esters." Beilstein Journal of Organic Chemistry 7 (June 20, 2011): 831–38. http://dx.doi.org/10.3762/bjoc.7.95.

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A novel synthetic methodology has been developed for the synthesis of diethyl 5-alkyl/aryl/heteroaryl substituted 3,4-dihydro-2H-pyrrole-4,4-dicarboxylates (also called 2-substituted pyrroline-4,5-dihydro-3,3-dicarboxylic acid diethyl esters) by iodide ion induced ring expansion of 2-[(aziridin-1-yl)-1-alkyl/aryl/heteroaryl-methylene]malonic acid diethyl esters in very good to excellent yields under mild reaction conditions. The electronic and steric impact of the substituents on the kinetics of ring expansion of N-vinyl aziridines to pyrrolines has been studied. Various diversely substituted

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48

He, Yan-Hong, Gang-Qiang Wang, Ke-Ling Xu, and Zhi Guan. "An Efficient Procedure for the Synthesis of Polysubstituted Pyrroles in an Ionic Liquid." Zeitschrift für Naturforschung B 66, no. 2 (2011): 191–96. http://dx.doi.org/10.1515/znb-2011-0212.

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The ionic liquid 1-butyl-3-methyl-imidazolium hydrogen sulfate, [bmim]HSO4, was used as a catalyst and reaction medium for the pyrrole synthesis, and a wide range of aliphatic, aromatic, heteroaromatic and carboxylic 1,4-diketones easily underwent condensations with aniline and ethylenediamine to form polysubstituted pyrroles. Sequential decarboxylation/Paal-Knorr pyrrole condensation was observed, which provides a new and facile approach to monoester pyrroles from 1,4-diketo-2,3-dicarboxylic acid esters.

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49

Yamamoto, S., E. Tanaka, Y. Shoji, Y. Kudo, H. Inokuchi, and H. Higashi. "Factors That Reverse the Persistent Depolarization Produced by Deprivation of Oxygen and Glucose in Rat Hippocampal CA1 Neurons In Vitro." Journal of Neurophysiology 78, no. 2 (1997): 903–11. http://dx.doi.org/10.1152/jn.1997.78.2.903.

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Yamamoto, S., E. Tanaka, Y. Shoji, Y. Kudo, H. Inokuchi, and H. Higashi. Factors that reverse the persistent depolarization produced by deprivation of oxygen and glucose in rat hippocampal CA1 neurons in vitro. J. Neurophysiol. 78: 903–911, 1997. In CA1 pyramidal neurons in rat hippocampal tissue slices, superfusion with ischemia-simulating medium produced a rapid depolarization after 6 min of exposure. The membrane potential eventually reached 0 after 5 min (a persistent depolarization), even when oxygen and glucose were reintroduced. The role of various ions in the reversal of this persisten

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MOSKALENKO, A. S., A. V. PROSYANIK, and R. G. KOSTYANOVSKII. "ChemInform Abstract: Improved Method for the Synthesis of 1-Alkoxyaziridine-2,2- dicarboxylic Acid Esters." ChemInform 22, no. 19 (2010): no. http://dx.doi.org/10.1002/chin.199119143.

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