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Journal articles on the topic 'Complex ester'

Author: Grafiati

Published: 7 June 2025

Last updated: 2 August 2025

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1

Mammadyarov, M. A., K. O. Israfilova, F. Kh Aliyeva, and F. I. Akhmedov. "Research of electric conductivity of esters of (C4-C10) terminal dicarboxylic acids depending on their chemical structure." World of petroleum products 06 (2021): 29–32. http://dx.doi.org/10.32758/2782-3040-2021-0-6-29-32.

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Using a teraohmmeter, the resistance indices of synthesized symmetric, asymmetric and complex esters of terminal dicarboxylic acids (TDA) of various structures were determined. The specific resistance and electrical conductivity of the obtained samples were determined. The properties of electrical conductivity are investigated depending on the structure of diesters and complex esters of TDA. It was found that in complex esters of TDA containing 3 or 4 ester groups, with an increase in the length of the carbon chain in the acid molecule, the electrical conductivity decreases. It was revealed th

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2

Hartendorp, Arnout P. T., Felix J. de Zwart, Hans Bieräugel, Bas de Bruin, Joost N. H. Reek, and Jan H. van Maarseveen. "Peptide cyclisation promoted by supramolecular complex formation." Organic & Biomolecular Chemistry 20, no. 3 (2022): 575–78. http://dx.doi.org/10.1039/d1ob02309h.

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3

Liao, De Zhong, Jie Yu He, Li Xin Mao, and Yi Xue Xu. "Green Ester Lubricants Based on Rapeseed Acid and their Lubricity." Advanced Materials Research 781-784 (September 2013): 988–92. http://dx.doi.org/10.4028/www.scientific.net/amr.781-784.988.

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Several complex esters were synthesized from phthalic anhydride, neopentyl glycol and rapeseed acid. Their rheological properties, biodegradability and tribological properties were measured. It was found that the complex esters have a wide viscosity range of 126~325mm2/s at 40°C with viscosity indices about 127~143, and solidifying points lower than-38°C. The maximum non seizure load of a complex ester with degree of polymerization 1.42 is as high as 735 N, with a wear scar diameter of 0.41mm, superior to mineral oil. The biodegradation rates are higher than 73%, and the thermal stability is g

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4

Baum, James Clayton, Kathleen Anne Durkin, Laura Precedo, et al. "Sulfonyl esters 3. The formation of sulfone-sulfonates in the reactions of aryl methanesulfonates with sodium hydride." Canadian Journal of Chemistry 69, no. 12 (1991): 2127–35. http://dx.doi.org/10.1139/v91-307.

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Sodium hydride reductions of aryl methanesulfonates afford dimeric sulfone-sulfonate esters as well as products arising from SO bond rupture. SO bond rupture becomes more competitive as the LUMO energy of the sulfonate ester declines. Exploration of the chemistry of a sulfone-sulfonate ester revealed a complex novel reaction that resulted in the formation of, inter alia, a dichloromethanesulfonate ester and a trichloromethanesulfonate ester. The first successful approaches to the synthesis of the heretofore unknown trichloromethanesulfonates and dichloromethanesulfonates are reported. Key word

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5

Balcar, Hynek, Alena Dosedlová, and Bohumír Matyska. "Interactions of tungsten hexachloride with esters of carboxylic acids." Collection of Czechoslovak Chemical Communications 51, no. 4 (1986): 753–62. http://dx.doi.org/10.1135/cccc19860753.

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The interactions of tungsten chlorides and oxychlorides with methyl 10-undecenoate, methyl palmitate and methyl acetate, respectively, have been investigated by UV-VIS, IR and EPR spectroscopic methods. The primary complex formed by coordination of the carbonyl group to WCl6 is converted successively to an analogical, very stable complex WOCl4.ester under the simultaneous formation of acyl chloride and methyl chloride. In the case of methyl undecenoate, the coordination reaction is accompanied by a partial reduction of WCl6 to WCl5. The latter reacts with the ester in excess to give a complex

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6

Shoukry, Azza, Mohamed Shoukry та Mohamed Hafez. "Kinetics of base hydrolysis of α-amino acid esters catalyzed by palladium(II) piperazine complex". Open Chemistry 8, № 4 (2010): 797–805. http://dx.doi.org/10.2478/s11532-010-0047-6.

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AbstractThe kinetics of base hydrolysis of glycine, histidine, and methionine methyl esters in the presence of [Pd(pip)(H2O)2]2+ complex, where pip is piperazine, is studied in aqueous solutions, at T = 25°C, and I = 0.1 mol dm−3. The rate of ester hydrolysis for glycine methyl ester is studied at different temperature and dioxane/water solutions of different compositions. The kinetic data are fit under the assumption that the hydrolysis proceeds in one step. The activation parameters for the base hydrolysis of the complexes are evaluated

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7

Tillin, Chloe, Raphael Bigler, Renata Calo-Lapido, Beatrice Collins, Adam Noble, and Varinder Aggarwal. "Complex Boron-Containing Molecules through a 1,2-Metalate Rearrangement/anti-S N 2′ Elimination/Cycloaddition Reaction Sequence." Synlett 30, no. 04 (2018): 449–53. http://dx.doi.org/10.1055/s-0037-1610389.

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The three-component coupling of benzylamines, boronic esters, and 4-phenyl-3H-1,2,4-triazole-3,5(4H)-dione (PTAD) is reported. The boronate complex formed from an ortho-lithiated benzylamine and a boronic ester undergoes a stereospecific 1,2-metalate rearrangement/anti-S N 2′ elimination in the presence of an N-activator to provide a dearomatized tertiary boronic ester. Interception of this dearomatized intermediate with a dienophile leads to stereopredictable cycloaddition reactions to generate highly complex three-dimensional boron-containing molecular structures. When enantioenriched α-meth

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8

Dessain, Edison C., and Dennis Anderson. "A Study of the Interaction of Phthalate Esters with Chlorine-Containing Polymers." Applied Spectroscopy 46, no. 1 (1992): 152–55. http://dx.doi.org/10.1366/0003702924444281.

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The infrared spectra of blends of various ortho-phthalate esters with polyvinyl chloride) and vinylidene chloride/(20%)acrylonitrile copolymer were recorded. The data indicate that the lowering of the ester carbonyl absorption frequency is due to a dipole-dipole/complex type interaction between the carbonyl of the ester and the chlorine of the polymer in addition to hydrogen bonding with acidic hydrogens. The lowering of the absorption frequence increases with an increase in the amount of chlorine in the polymer chain.

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9

Arrendale, RF, RF Severson, OT Chortyk, and MG Stephenson. "Isolation and Identification of the Wax Esters from the Cuticular Waxes of Green Tobacco Leaf." Beiträge zur Tabakforschung International/Contributions to Tobacco Research 14, no. 2 (1988): 67–84. http://dx.doi.org/10.2478/cttr-2013-0587.

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AbstractRecent studies in our laboratory on the cuticular chemicals of green tobacco leaf have revealed the presence of wax esters, composed of fatty acids bound to fatty alcohols. Cuticular components of young green NC 2326 tobacco leaves were removed with methylene chloride, and partitioned between hexane and 80 % MeOH-H2O. The hexane-soluble fraction, which contained wax esters, paraffinic hydrocarbons, and fatty alcohols, was separated by silicic acid column chromatography, and the resulting wax ester fraction was further purified by lipophilic gel chromatography. Initial analyses of the w

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10

Bartlett, Samuel, Kimberly Keiter, Blane Zavesky та Jeffrey Johnson. "Formation of Complex α-Imino Esters via Multihetero-Cope Rearrangement of α-Keto Ester Derived Nitrones". Synthesis 51, № 01 (2018): 203–12. http://dx.doi.org/10.1055/s-0037-1610391.

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A sequential benzoylation and multihetero-Cope rearrangement of α-keto ester derived nitrones has been developed. The reaction furnishes a diverse array of complex α-imino ester derivatives. The products can be transformed into amino alcohols via LiAlH4 reduction.

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11

Ito, Masami, and Yu-saku Takita. "Ester transfication by Ni(II) hydroxy complex." Journal of Inorganic Biochemistry 67, no. 1-4 (1997): 183. http://dx.doi.org/10.1016/s0162-0134(97)80060-8.

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12

Wang, Dawei, Yanwei Zhang, Rong Cai, and Xiaodong Shi. "Triazole–Au(I) complex as chemoselective catalyst in promoting propargyl ester rearrangements." Beilstein Journal of Organic Chemistry 7 (July 25, 2011): 1014–20. http://dx.doi.org/10.3762/bjoc.7.115.

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Triazole–Au (TA–Au) catalysts were employed in several transformations involving propargyl ester rearrangement. Good chemoselectivity was observed, which allowed the effective activation of the alkyne without affecting the reactivity of the allene ester intermediates. These results led to the investigation of the preparation of allene ester intermediates with TA–Au catalysts under anhydrous conditions. As expected, the desired 3,3-rearrangement products were obtained in excellent yields (generally >90% yields with 1% loading). Besides the typical ester migrating groups, carbonates and carba

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13

Torshin, I. Yu, and O. A. Gromova. "Biophysical modeling indicates a high affinity of ethyl esters of omega-3 polyunsaturated fatty acids to the enzymes of the pro-inflammatory arachidonic acid cascade." FARMAKOEKONOMIKA. Modern Pharmacoeconomics and Pharmacoepidemiology 15, no. 2 (2022): 221–29. http://dx.doi.org/10.17749/2070-4909/farmakoekonomika.2022.142.

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Background. Omega-3 polyunsaturated fatty acids (ω-3 PUFAs) are widely used in modern cardiology. The anti-inflammatory effect of eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) is realized, in particular, by modulating the activity of the arachidonic acid (ARA) cascade.Objective: to conduct biophysical analysis of the interactions of various forms of PUFAs (ARA, EPA, DHA, EPA and DHA ethyl esters) with three target proteins-enzymes of the ARA cascade (cyclooxygenase-1 (COX-1), COX-2, 5-lipoxygenase (5-LPOG)).Material and methods. The minimization of the energy of the ligand-recepto

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14

Grant, Jewel T., Nicholas Dunwoody, Vladimír Jakúbek, and Alistair J. Lees. "Photoluminescent Organometallic Complexes as Spectroscopic Probes of Aromatic Cyanate Ester Polymerization." Engineering Plastics 6, no. 1 (1998): 147823919800600. http://dx.doi.org/10.1177/147823919800600107.

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The organometallic complex, fac-ClRe(CO)3(4,7-Ph2-phen), where 4,7-Ph2-phen is 4,7 diphenyl-1,10-phenanthroline, has been found to be luminescent and act as a spectroscopic probe in the polymerization of the aromatic cyanate ester monomer AroCy® L-10 and the related prepolymer AroCy® B-30. The photoluminescence arises from a low-lying metal-to-ligand charge transfer (MLCT) excited state in the metal complex, and this emission band is centred at 580 nm in methylene chloride solution at 298 K. When the complex is incorporated in the cyanate ester resin its emission band appears as a weak feature

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15

Grant, Jewel T., Nicholas Dunwoody, Vladimír Jakúbek, and Alistair J. Lees. "Photoluminescent Organometallic Complexes as Spectroscopic Probes of Aromatic Cyanate Ester Polymerization." Polymers and Polymer Composites 6, no. 1 (1998): 47–50. http://dx.doi.org/10.1177/096739119800600107.

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The organometallic complex, fac-ClRe(CO)3(4,7-Ph2-phen), where 4,7-Ph2-phen is 4,7 diphenyl-1,10-phenanthroline, has been found to be luminescent and act as a spectroscopic probe in the polymerization of the aromatic cyanate ester monomer AroCy® L-10 and the related prepolymer AroCy® B-30. The photoluminescence arises from a low-lying metal-to-ligand charge transfer (MLCT) excited state in the metal complex, and this emission band is centred at 580 nm in methylene chloride solution at 298 K. When the complex is incorporated in the cyanate ester resin its emission band appears as a weak feature

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16

Ahmad Khairi, Muntaz Hana, Saiful Amri Mazlan, Ubaidillah, et al. "The field-dependent complex modulus of magnetorheological elastomers consisting of sucrose acetate isobutyrate ester." Journal of Intelligent Material Systems and Structures 28, no. 14 (2017): 1993–2004. http://dx.doi.org/10.1177/1045389x16682844.

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In this work, epoxidized natural rubber-50 magnetorheological elastomer was synthesized using conventional rubber processing. The ester plasticizer sucrose acetate isobutyrate was then incorporated into epoxidized natural rubber-50 to soften the matrix and to improve the relative magnetorheological effect. The influence of sucrose acetate isobutyrate ester on the microstructures and properties of epoxidized natural rubber-50 magnetorheological elastomers were experimentally investigated. It has been identified that the addition of sucrose acetate isobutyrate ester can reduce the viscosity of t

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17

Jorio, Souad, Mohammed Salah, Hassna Abou El Makarim, and Mohammed Tabyaoui. "Reactivity Indices related to DFT Theory, the Electron Localization Function (ELF) and Non-Covalent Interactions (NCI) Calculations in the Formation of the non-Halogenated Pyruvic Esters in Solution." Mediterranean Journal of Chemistry 8, no. 6 (2019): 476–85. http://dx.doi.org/10.13171/mjc8619072612sj.

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The non-halogenated pyruvic esters are essential compounds, considering that they exhibit particular properties, due to the proximity of two functional groups: carbonyl and ester. These molecules can be obtained from the approach of the Lewis acid MgI2 on the iodinated pyruvic ester by using sodium hydrogen sulfite in aqueous solution, which selectively reduces the carbon-iodine bond of the iodinated pyruvic ester. The sites of attack of hydrogen sulfite of this reaction remained uncertain and were the subject of a debate between the experimenters. Our aim in this work is to determine the more

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18

Sova, Nadiya, Bohdan Savchenko, Victor Beloshenko, Aleksander Slieptsov, and Iurii Vozniak. "Sorption Properties of PET Copolyesters and New Approach for Foaming with Filament Extrusion Additive Manufacturing." Polymers 15, no. 5 (2023): 1138. http://dx.doi.org/10.3390/polym15051138.

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The mass transfer process of binary esters of acetic acid in polyethylene terephthalate (PET), polyethylene terephthalate with a high degree of glycol modification (PETG), and glycol-modified polycyclohexanedimethylene terephthalate (PCTG) was studied. It was found that the desorption rate of the complex ether at the equilibrium point is significantly lower than the sorption rate. The difference between these rates depends on the type of polyester and temperature and allows the accumulation of ester in the volume of the polyester. For example, the stable content of acetic ester in PETG at 20 °

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19

Lutter, Michael, Lukas M. Stratmann, and Klaus Jurkschat. "The tert-butylaminomethyl(mesityl)phosphinic acid ester and formation of its zinc dichloride complex: syntheses and characterization." Main Group Metal Chemistry 41, no. 3-4 (2018): 109–13. http://dx.doi.org/10.1515/mgmc-2018-0014.

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Abstract The syntheses and structures of tert-butylaminomethyl(mesityl)phosphinic acid ethyl ester 2 and its zinc dichloride complex 3 are reported. In the solid state, both compounds are dimeric via hydrogen bridges. In the complex 3, the phosphinic acid ester 2 coordinates the zinc dichloride diastereoselectively.

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20

Signoret, N., M. M. Rosenkilde, P. J. Klasse, et al. "Differential regulation of CXCR4 and CCR5 endocytosis." Journal of Cell Science 111, no. 18 (1998): 2819–30. http://dx.doi.org/10.1242/jcs.111.18.2819.

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The chemokine receptors CCR5 and CXCR4 are major co-receptors/receptors for the CD4-dependent and CD4-independent entry of human and simian immunodeficiency viruses. The chemokines that bind and activate these receptors can inhibit the entry of viruses that use the respective co-receptor molecules. Chemokine-induced co-receptor internalisation is a significant component of the mechanism through which chemokines inhibit virus entry. CXCR4 internalisation is induced by the CXCR4 ligand stromal cell derived factor-1 (SDF-1), phorbol esters and, in T cells, cellular activation. Here we show that C

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21

Kozak, M. R., and I. M. Petruh. "Blood biochemical parameters in mice under the action of polyphosphate esters and their complexes with antibiotics." Animal Biology 25, no. 2 (2023): 3–7. http://dx.doi.org/10.15407/animbiol25.02.003.

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Complexes of polyphosphate esters with antibiotics were developed in Lviv Polytechnic National University together with scientists of Institute of Animal Biology NAAS to reduce the negative impact of antibiotics on the animal body. The conducted experiments allow assessing the effect of antibiotics, polyphosphate esters and complexes of polyphosphate esters with antibiotics on the body of laboratory animals based on biochemical markers of hepato- and nephrotoxicity. The antibiotics were administered in average daily therapeutic doses. It was found that the physiological state of mice and their

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22

Parmanov, Askar B., Suvankul E. Nurmanov, Mirjalol E. Ziyadullaev, Navro’za U. Bekboyeva, Nizombek D. Xolmuhammedov, and Shavkat Sh Tursunov. "Catalytic Reaction with Benzoic Acid Phenylacetylene in the Presence of Complex Catalysts." Asian Journal of Chemical Sciences 13, no. 3 (2023): 35–40. http://dx.doi.org/10.9734/ajocs/2023/v13i3242.

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In this work, we studied the processes of vinyl ester formation by the addition of benzoic acid to phenylacetylene in the presence of complex catalysts of diacetate-di (2-amino-5-methylthio-1,3,4-thiadiazolo) cobalt(II) ([Co(C3H5N3S2)2(CH3COO)2] and tetrakis(2-amino-5-ethylthio-1,3,4-thiadiazole)-zinc(II) dinitrate ([Zn(C4H7S2)4](NO3)2): 1-phenylvinyl benzoate and anti-Markovnikov coupling product - styryl benzoate were obtained. The effect of the nature of solvents on the yields of products in the presence of the [Zn(C4H7S2)4](NO3)2 complex catalyst was studied. The structure of the synthesiz

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23

Celano, Giuseppe, Francesco Maria Calabrese, Giuseppe Riezzo, et al. "Effects of a Very-Low-Calorie Ketogenic Diet on the Fecal and Urinary Volatilome in an Obese Patient Cohort: A Preliminary Investigation." Nutrients 15, no. 17 (2023): 3752. http://dx.doi.org/10.3390/nu15173752.

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Several recent studies deepened the strong connection between gut microbiota and obesity. The effectiveness of the very-low-calorie ketogenic diet (VLCKD) has been measured in terms of positive impact on the host homeostasis, but little is known of the modification exerted on the intestinal metabolome. To inspect this complex relationship, we analyzed both fecal and urinary metabolome in terms of volatile organic compounds (VOCs) by the GC-MS method in 25 obese patients that were under VLCKD for eight weeks. Partial least square discriminant analysis evidenced specific urinary and fecal metabo

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24

Baktybayeva, L. K., G. D. Daulet, K. V. Yu, B. A. Malmakova, G. A. Zazybin, and G. K. Satybaldyeva. "EFFECT OF NITROGEN-CONTAINING COMPOUNDS ON PERIPHERAL BLOOD PARAMETERS IN THE BACKGROUND OF EXPERIMENTAL PANCYTOPENIA." REPORTS 2, no. 336 (2021): 61–67. http://dx.doi.org/10.32014/2021.2518-1483.31.

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1-(2-phenylethyl)-4-ketoxympiperidine o-fluorobenzoic acid hydrochloride, a complex with β-cyclodextrin p-fluorobenzene carbonylamide morpholine, a complex with β-cyclodextrin o-fluorobenzene carbonylamide piperidine had high myelostimulating activity at the level of the comparison drug methyluracil. 1-(3-ethoxypropyl)-4-ketoxympiperidine p-fluorobenzoic acid ester hydrochloride, 1-(2-phenylethyl)-4-ketoxympiperidine m-fluorobenzoic acid ester hydrochloride, 1-(2-phenylethyl)-4-ketoxympiperidine p-fluorobenzoic acid ester hydrochloride did not possess leukopoiesis-stimulating activity, but sho

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25

Feng, Fa Mei, Xi Yang He, and Tao Wang. "The Study of the Degradation of the Phosphate Ester Catalyzed by the Nitrogen Unsaturated Heterocycle Cerium(III) Complex." Advanced Materials Research 518-523 (May 2012): 541–44. http://dx.doi.org/10.4028/www.scientific.net/amr.518-523.541.

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Phosphate ester and its ramifications in the pesticide are virulent and some are known to be human carcinogens. The removal of phosphate ester in the leftover of the pesticide has been a major environmental concern. The Cerium(III) complex made up of a nitrogen unsaturated heterocycle ligand and Cerium ion(III) was used in the catalytic degradation of bis(4-nitrophenyl) phosphate ester (BNPP). This catalytic system showed higher catalytic activity and better reproducibility and stability than other similar Cerium(III) systems. The rate of the BNPP catalytic degradation was about 109 -fold fast

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26

Freiesleben, Doris, Kurt Polborn, Christian Robl, Karlheinz Sünkel, and Wolfgang Beck. "Metal complexes of biologically important ligands, LXXVIII. Synthesis of palladium complexes of ferrocenyl-substituted amino acid derivatives." Canadian Journal of Chemistry 73, no. 7 (1995): 1164–74. http://dx.doi.org/10.1139/v95-143.

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Schiff bases from ferrocene aldehyde and α-amino acidates react with PdCl2 or Na2PdCl4 to give N,O-chelate complexes (2a–e, 3). The related N-ferrocenylmethylen-α-amino acid esters give, with Pd(OAc)2, cyclopalladated acetate-bridged complexes (4a,b). N,O-chelate complexes (5–7) are obtained from Na2PdCl4 with N-ferrocenylmethyl prolinate and-alaninate as well as with N,N-dibenzyl glycinate. The ethyl ester of N,N-dibenzylglycine and Pd(OAc)2 form the cyclopalladated acetate-bridged complex 8, while the ester of N-monobenzylglycine and Na2PdCl4 affords trans-PdCl2(L)2 with a monodentate N-coor

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27

GROS, CLAUDE P., LAURENT JAQUINOD, RICHARD G. KHOURY, MARILYN M. OLMSTEAD та KEVIN M. SMITH. "Approaches to β-Fused Porphyrinoporphyrins: Pyrrolo- and Dipyrromethaneporphyrins". Journal of Porphyrins and Phthalocyanines 01, № 02 (1997): 201–12. http://dx.doi.org/10.1002/(sici)1099-1409(199704)1:2<201::aid-jpp25>3.0.co;2-4.

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Reaction of (2-nitro-5,10,15,20-tetraphenylporphyrinato)nickel(II) 3 or its copper(II) complex 4 with α-isocyanoacetic esters in the presence of 1,8-diazabicyclo[5.4.O]undec-7-ene accomplishes the first syntheses of β-fused pyrroloporphyrins (e.g. 5–10). The removal of the fused pyrrole ester protecting groups to give the di-α-free pyrroloporphyrins 2a and 13 is described, as well as some pyrrole-type chemistry. Unsymmetrical fused dipyrromethanoporphyrins (16–18) were synthesized by reacting 5-acetoxymethylpyrrole-2-carboxylates (14,15) with mono-α-free pyrroloporphyrins (5–8) in the presence

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28

Niemevz, Fernando, and Graciela Y. Buldain. "Phenyl biliverdin isomers obtained by chemical oxidation of iron(III) complex of 5-phenyl protoporphyrin IX." Journal of Porphyrins and Phthalocyanines 08, no. 07 (2004): 989–95. http://dx.doi.org/10.1142/s1088424604000350.

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Oxidative cleavage of synthetic 5-phenyl protohemin IX in pyridine solution in the presence of ascorbic acid (coupled oxidation), followed by esterification of the products with boron trifluoride-methanol rendered mainly three isomeric biliverdins. These were identified by MS and 1D and 2D 1 H NMR as 15-phenyl biliverdin IXβ (1), 10-phenyl biliverdin IXγ (2) and 5-phenyl biliverdin IXδ (3) dimethyl esters. The fact that biliverdin IXα dimethyl ester derivative is not obtained indicates that oxidation fails to occur in the α-meso-carbon bearing the phenyl group.

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29

Napitupulu, Mery, Daud K. Walanda, Geoffrey A. Lawrance, and Marcel Maeder. "PHOSPHATE ESTER HYDROLYSIS PROMOTED BY AN AMIDOPYRIDINE CARBOXYLATE COMPLEX." Rasayan Journal of Chemistry 11, no. 2 (2018): 894–903. http://dx.doi.org/10.31788/rjc.2018.1122060.

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30

Bagal, Ujjvala A., C. Brant Cook, and Thomas L. Riechel. "Electrochemical characterization of a new vanadium penicillamine-ester complex." Inorganica Chimica Acta 180, no. 1 (1991): 57–62. http://dx.doi.org/10.1016/s0020-1693(00)83065-0.

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31

Kuzmina, N. S., S. V. Portnova, and E. L. Krasnykh. "Esterification of malic acid on various catalysts." Fine Chemical Technologies 15, no. 2 (2020): 47–55. http://dx.doi.org/10.32362/2410-6593-2020-15-2-47-55.

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Objectives. The study aims to identify the optimal choice of an effective catalyst for the esterification of malic acid to produce esters of high purity. Methods. To determine the qualitative and quantitative composition of reaction masses, the following analysis methods were used: mass-spectroscopy (using FinniganTrace DSQ device with NIST 2002, Xcalibur 1.31 Sp 5 database) and gas–liquid chromatography (using the Kristall 2000M software and hardware complex). Results. Esters of malic acid and butyl alcohol of normal structure were synthesized using the following catalysts: sulfuric, orthopho

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32

R., VIJAYALAKSHMI RAO, and THIMME GOWDA B. "Kinetics and Mechanism of Ruthenium(III) catalysed Oxidation of Aliphatic Esters by Bromamine-T in Aqueous Perchloric Acid Medium." Journal of Indian Chemical Society Vol. 68, Apr 1991 (1991): 210–14. https://doi.org/10.5281/zenodo.5993828.

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Department of Post-Graduate Studies and Research in Chemistry, Mangalore University, Mangalagangothri-574 199 <em>Manuscript received 19 March 1990. accepted 9 April 1991</em> Kinetics of ruthenium(III) catalysed oxidation of four aliphatic esters. viz. methyl, ethyl, n-propyl and n-butyl acetates by bromamine-T (BAT) have been studied In aqueous perchloric acid medium. The reactions followed zero order kinetics In [BAT] and [H<sup>+</sup>] and fractional order In [ester] and [Ru<sup>III</sup>]. Effects of added Cl<sup>-</sup> ion and varying Ionic strength of the medium on the rate

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33

Masters, Andrew P., John F. Richardson та Ted S. Sorensen. "The synthesis and X-ray structures of η1-, η3-, and η5-dienolate complexes of manganese carbonyl". Canadian Journal of Chemistry 68, № 12 (1990): 2221–27. http://dx.doi.org/10.1139/v90-341.

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The η1-, η3-, and η5-ester dienolate complexes of Mn(CO)n have been prepared and the crystal structures of the phenyl ester member have been obtained for all three bonding modes. The allyl (anti- η3) member shows some bonding distortions compared to a simple allyl ligand. The structure of the η5-1-oxapentadienyl ligand complex is substantially different from a rhenium analog in that the organic ligand is non-planar with significantly different bond distances. The η5-complex reacts rapidly with triphenylphosphine to generate the syn-η3-complex. Keywords:

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34

Vijayagopal, P. "Regulation of the metabolism of lipoprotein-proteoglycan complexes in human monocyte-derived macrophages." Biochemical Journal 301, no. 3 (1994): 675–81. http://dx.doi.org/10.1042/bj3010675.

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Studies were performed to evaluate the effect of several factors on the metabolism of lipoprotein-proteoglycan complexes in human monocyte-derived macrophages. In vivo apoB-lipoprotein-proteoglycan complex was isolated from human aorta fibrous-plaque lesions and low-density lipoprotein (LDL)-proteoglycan complex was formed in vitro. Degradation of LDL-proteoglycan complex and cholesteryl ester synthesis mediated by the in vivo and in vitro complexes were lowest in freshly isolated monocytes. With the maturation of monocytes into macrophages, there was a dramatic rise in both. The degradation o

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Mudarisova, R. Kh, O. S. Kukovinets, and S. V. Kolesov. "Structural correlations of complexation of apple pectin with imidazole and L-histidine methyl ester." Журнал общей химии 93, no. 5 (2023): 776–84. http://dx.doi.org/10.31857/s0044460x23050128.

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The thermodynamic and structural study of the complex formation of apple pectin with structural analogs of histidine (imidazole and its methyl ester) was carried out using spectral methods. The composition, stability constants of the complexes, and standard thermodynamic characteristics (Δ G° , Δ H° , Δ S° ) of the complex formation process were determined. The decisive contribution of the imidazole fragment of the amino acid to the stability of the pectin-histidine complex is shown. The esterification of the carboxyl group of histidine, its conversion into methyl ester, has an insignificant e

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Shih, Ming-Kuei, You-Lin Tain, Chiu-Min Cheng, et al. "Separation and Identification of Resveratrol Butyrate Ester Complexes and Their Bioactivity in HepG2 Cell Models." International Journal of Molecular Sciences 22, no. 24 (2021): 13539. http://dx.doi.org/10.3390/ijms222413539.

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Resveratrol butyrate ester (RBE) complexes have demonstrated higher antioxidant capacity and anti-fat accumulation activity in previous studies. In this study, silica gel, high-performance liquid chromatography, and 1H nuclear magnetic resonance were used for separation and identification of RBE complex components. With the exception of resveratrol, five different structures of ester derivatives were separated from silica gel: 3,4′-di-O-butanoylresveratrol (ED2, 18.8%), 3-O-butanoylresveratrol (ED4, 35.7%), 4′-O-butanoylresveratrol (ED5, 4.4%), 3,5,4′-tri-O-butanoylresveratrol (ED6, 1.5%), and

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Trøen, G., A. Nilsson, K. R. Norum, and R. Blomhoff. "Characterization of liver stellate cell retinyl ester storage." Biochemical Journal 300, no. 3 (1994): 793–98. http://dx.doi.org/10.1042/bj3000793.

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The stellate cells of the liver are the main storage site of retinyl esters in the body. During cultivation in vitro of stellate cells isolated from rat and rabbit livers were observed that the cells rapidly loose their retinyl ester content. Freshly isolated stellate cells contain about 144 nmol of total retinol/mg of protein, while cells cultivated for 14 days contained below 0.1 nmol/mg of protein. When 3-day-old cultures were incubated for 6 h with 2 microM retinol, the cellular content increased from 5.6 to approx. 9.4 nmol of total retinyl esters/mg of protein. In contrast, little retiny

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Almahbobi, G., and P. F. Hall. "The role of intermediate filaments in adrenal steroidogenesis." Journal of Cell Science 97, no. 4 (1990): 679–87. http://dx.doi.org/10.1242/jcs.97.4.679.

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Cholesterol is stored in adrenal cells as ester in lipid droplets, which are transported to mitochondria to provide a substrate for steroid hormone synthesis. Using mouse adrenal tumour cells (Y-1), we show here that approximately 33% of the adrenal cell cholesterol ester is bound tightly to intermediate filaments while the rest is either loosely attached or free in the cytosol. Specific binding of droplets to intermediate filaments was demonstrated by immunofluorescence and electron microscopy. Immunofluorescence was based upon Nile Red to stain lipid and antibodies to vimentin, actin and tub

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39

Schreiner, Bernhard, Barbara Wagner-Schuh та Wolfgang Beck. "Metal Complexes of Biologically Important Ligands, CLXXV [1]. Pentamethylcyclopentadienyl Halfsandwich Complexes of Rhodium(III) and Iridium(III) with Schiff Bases from 2-(Diphenylphosphino)- benzaldehyde and α-Amino Acid Esters". Zeitschrift für Naturforschung B 65, № 6 (2010): 679–86. http://dx.doi.org/10.1515/znb-2010-0603.

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The reactions of the chlorido-bridged complexes [Cp*M(Cl)(μ-Cl)]2 (M = Rh, Ir) with Schiff bases (P-N-O) from 2-(diphenylphosphino)benzaldehyde and α-amino acid esters afford the complexes Cp*M(Cl)2(P-N-O) in which the ligands function as monodentate P donors (M = Ir) or as bidentate P-N donors (M = Rh). These complexes can be converted into cationic complexes [Cp*M(Cl)(P-NO)]+ with bidentate P-N ligands by treatment with NH4PF6. The cationic complexes [Cp*M(Cl)(PN- O)]+Cl− have been detected also in solutions of Cp*M(Cl)2(P-N-O). The P-N-coordinated complex [Cp*Rh(Cl)(Ph2P-C6H4-C(H)=N-C(H)(CH

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40

Bissessar, Damien, Thibault Thierry, Julien Egly, et al. "Cubane Copper(I) Iodide Clusters with Remotely Functionalized Phosphine Ligands: Synthesis, Structural Characterization and Optical Properties." Symmetry 15, no. 6 (2023): 1210. http://dx.doi.org/10.3390/sym15061210.

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We present here the synthesis, chemical, and photophysical study of a series of three new copper halide derivatives, namely 2a–c. They are all tetranuclear copper-iodide clusters of general formula [Cu(μ3-I)P]4 consisting of a cubane-like {Cu4I4} motif and P = phosphine. They differ in the type of the phosphines used as ligands: a monophosphine with a single pendant ester unit (complex 2a), two pendant ester units (2b), and a diphosphine containing two esters in the linker (2c). The molecular structure of the complexes was determined by single-crystal X-ray diffraction analysis. All the invest

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Starynowicz, Przemys?aw. "An ytterbium(ii) complex with dimethyl ester of oxydiacetic acid." Dalton Transactions, no. 26 (2007): 2779. http://dx.doi.org/10.1039/b702971c.

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42

Asiedu, Clement, Joseph Biggs, and Andrew S. Kraft. "Complex Regulation of CDK2 During Phorbol Ester-Induced Hematopoietic Differentiation." Blood 90, no. 9 (1997): 3430–37. http://dx.doi.org/10.1182/blood.v90.9.3430.

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Abstract Phorbol myristate acetate (PMA) treatment of U937 human leukemic cells results in late G1 cell cycle arrest and terminal monocyte/macrophage-like differentiation. The PMA-induced G1 arrest involves a marked decrease in cdk2 activity, which correlates with total cdk2 dephosphorylation. Here, we show that the levels of cyclin A mRNA and protein markedly decrease during PMA-induced differentiation of U937 cells. In contrast, the level of cyclin E protein remains unchanged and in a complex with cdk2 during the entire course of PMA treatment. During the PMA-induced differentiation, cyclin

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Ikeno, Shinya, and Tetsuya Haruyama. "Biological phosphate ester sensing using an artificial enzyme PMP complex." Sensors and Actuators B: Chemical 108, no. 1-2 (2005): 608–12. http://dx.doi.org/10.1016/j.snb.2004.11.077.

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Kantacha, Anob, Rebecca Buchholz, Sarah J. Smith, Gerhard Schenk, and Lawrence R. Gahan. "Phosphate ester cleavage promoted by a tetrameric iron(III) complex." JBIC Journal of Biological Inorganic Chemistry 16, no. 1 (2010): 25–32. http://dx.doi.org/10.1007/s00775-010-0696-0.

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45

Lee, Dong-Heon. "Synthesis and Structural Characterization of Cu(II) Complex of a L-Methionine Ethyl Ester Derivative." Journal of the Korean Chemical Society 47, no. 4 (2003): 427–31. http://dx.doi.org/10.5012/jkcs.2003.47.4.427.

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Nylander, Filip, Hampus Sunner, Lisbeth Olsson, Paul Christakopoulos, and Gunnar Westman. "Synthesis and enzymatic hydrolysis of a diaryl benzyl ester model of a lignin-carbohydrate complex (LCC)." Holzforschung 70, no. 5 (2016): 385–91. http://dx.doi.org/10.1515/hf-2014-0347.

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Abstract Specific degradation of the bonds between lignin and carbohydrates is an important step towards separating individual lignocellulosic biopolymers for sustainable production of materials and chemicals. One of the most established covalent lignin-carbohydrate (LC) interactions is the ester bond between the α- or γ-hydroxyl group of a lignin phenylpropane unit and a glucuronic acid side chain of xylan. In this work, a model of the LC benzyl ester bond was synthesized in a one-pot reaction from a β-O-4 lignin unit and d-glucuronic acid, both from commercial sources. The resulting lignin-c

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47

Bergs, Ralph, Roland Krämer, Michael Maurus, et al. "Metallkomplexe mit biologisch wichtigen Liganden, LXXXIV [1] Halbsandwich-Komplexe von Rhodium(III), Iridium(III), Cobalt(III), Ruthenium(II), Ruthenium(III) und Chrom(III) mit Aminosäureester-Liganden Metal Complexes with Biologically Important Ligands, LXXXIV [1] Half-Sandwich Complexes o f Rhodium(III), Iridium(III), Cobalt(III), Ruthenium(II), Ruthenium(III) and Chromium(III) with Amino Acid Ester Ligands." Zeitschrift für Naturforschung B 51, no. 2 (1996): 187–200. http://dx.doi.org/10.1515/znb-1996-0205.

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Abstract A series of cyclopentadienyl and pentamethylcyclopentadienyl complexes of cobalt, rhodium, iridium, ruthenium and chromium with a-amino-acid esters (L) as ligands was prepared and characterized: Cp*(Cl)2M(L) (1, 2: M = Rh, Ir), Cp(I)2Co(L) (4), [Cp(Ph3P)2Ru(L)]+BF- (6), [Cp(OC)(Ph3P)Ru]+BF- (7) and the paramagnetic compounds Cp*(Cl)2Ru(L) (8) and Cp(Br)2Cr(L) (9). AlaOMe and HisOMe form N ,O and N,N chelate complexes [Cp*(Cl)M(alaOMe)]+BF-4 (3: M = Rh, Ir), [Cp(I)Co(hisOMe)]+BF4. Cp*Co(CO)I2 and GlyOMe gave the N,O-dipeptide ester complex Cp*(I)Co(glyglyOMe)]+BF-4 (5). The crystal str

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48

Aleksandrovic, Vesna, and Jasna Djonlagic. "Synthesis and characterization of thermoplastic copolyester elastomers modified with fumaric moieties." Journal of the Serbian Chemical Society 66, no. 3 (2001): 139–52. http://dx.doi.org/10.2298/jsc0103139a.

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A series of poly(ether-ester)s derived from dimethyl terephthalate (DMT), dimethyl fumarate (DMF), 1,4-butandiol (BD) and poly(tetramethylene oxide) (PTMO,Mn = 1000 g/mol) was synthesized in a two stage process involving transesterification and polycondensation in the melt. The mole ratio of the starting components was selected to result in copolymers with a constant hard:soft segment wieght ratio (56:44). The amount of DMF was 10 mol %, referred to the total amount of the esters used. The synthesis was optimized in terms of both the concentration of catalyst, tetra-n-butyl-titanate, Ti(OBu)4

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49

Auer, Alexandra, Julia von Blume, Sabine Sturany, et al. "Role of the Regulatory Domain of Protein Kinase D2 in Phorbol Ester Binding, Catalytic Activity, and Nucleocytoplasmic Shuttling." Molecular Biology of the Cell 16, no. 9 (2005): 4375–85. http://dx.doi.org/10.1091/mbc.e05-03-0251.

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Protein kinase D2 (PKD2) belongs to the PKD family of serine/threonine kinases that is activated by phorbol esters and G protein-coupled receptors (GPCRs). Its C-terminal regulatory domain comprises two cysteine-rich domains (C1a/C1b) followed by a pleckstrin homology (PH) domain. Here, we examined the role of the regulatory domain in PKD2 phorbol ester binding, catalytic activity, and subcellular localization: The PH domain is a negative regulator of kinase activity. C1a/C1b, in particular C1b, is required for phorbol ester binding and gastrin-stimulated PKD2 activation, but it has no inhibit

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Xi, Yumeng, Qiaoyi Wang, Yijin Su, Minyong Li, and Xiaodong Shi. "Quantitative kinetic investigation of triazole–gold(i) complex catalyzed [3,3]-rearrangement of propargyl ester." Chem. Commun. 50, no. 17 (2014): 2158–60. http://dx.doi.org/10.1039/c3cc49351b.

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