Relevant bibliographies by topics / Experimental physical Meldrum acid coumarin

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Academic literature on the topic 'Experimental physical Meldrum acid coumarin'

Author: Grafiati
Published: 4 June 2025
Last updated: 1 August 2025

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Journal articles on the topic "Experimental physical Meldrum acid coumarin"

1

Rana, Jasneet, Jyoti Yadav, and R. P. Chaudhary. "TFE assisted mechanochemical synthesis of new pyrazolones from Meldrum acid carbothioamides-Experimental and theoretical studies." Molecular Catalysis 539 (March 2023): 113002. http://dx.doi.org/10.1016/j.mcat.2023.113002.

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2

Shubha, J. P., and Puttaswamy. "Kinetics and Mechanism of Oxidation of Coumarin and Substituted Coumarins by Chloramine-b in Hydrochloric Acid Medium." Progress in Reaction Kinetics and Mechanism 33, no. 4 (2008): 313–30. http://dx.doi.org/10.3184/146867808x372604.

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The kinetics of oxidation of coumarin (see Equation (1)) and four substituted coumarins, viz. 7-methoxycoumarin, 7-ethoxycoumarin, 7-hydroxycoumarin and 7-nitrocoumarin, to the corresponding o-hydroxycinnamic acids by chloramine-B (CAB) have been studied at 298 K. Under comparable experimental conditions, the reaction rate shows a first-order dependence each upon [CAB]o and [coumarin]o, and individually less than unit order dependence on [H+] and [Cl-]. Addition of benzenesulfonamide retards the reaction rate and the dielectric effect is positive. Variation of ionic strength of the medium does
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3

Masuri, Sebastiano, Benedetta Era, Francesca Pintus, et al. "Hydroxylated Coumarin-Based Thiosemicarbazones as Dual Antityrosinase and Antioxidant Agents." International Journal of Molecular Sciences 24, no. 2 (2023): 1678. http://dx.doi.org/10.3390/ijms24021678.

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The design of novel antityrosinase agents appears extremely important in medical and industrial sectors because an irregular production of melanin is related to the insurgence of several skin-related disorders (e.g., melanoma) and the browning process of fruits and vegetables. Because melanogenesis also involves a nonenzymatic oxidative process, developing dual antioxidant and antityrosinase agents is advantageous. In this work, we evaluated the antioxidant and tyrosinase inhibition ability of two new bishydroxylated and two new monohydroxylated derivatives of (1E)-2-(1-(2-oxo-2H-chromen-3-yl)
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4

Malacaria, Luana, Giuseppina Anna Corrente, Amerigo Beneduci, Emilia Furia, Tiziana Marino, and Gloria Mazzone. "A Review on Coordination Properties of Al(III) and Fe(III) toward Natural Antioxidant Molecules: Experimental and Theoretical Insights." Molecules 26, no. 9 (2021): 2603. http://dx.doi.org/10.3390/molecules26092603.

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This review focuses on the ability of some natural antioxidant molecules (i.e., hydroxycinnamic acids, coumarin-3-carboxylic acid, quercetin, luteolin and curcumin) to form Al(III)- and Fe(III)-complexes with the aim of evaluating the coordination properties from a combined experimental and theoretical point of view. Despite the contributions of previous studies on the chemical properties and biological activity of these metal complexes involving such natural antioxidants, further detailed relationships between the structure and properties are still required. In this context, the investigation
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5

Shen, Chengzhen, Jie Peng, Jianxin Guan, et al. "Relative molecular orientations in organic optoelectronic films probed via polarization-selected UV/IR mixed frequency ultrafast spectroscopy." Chinese Journal of Chemical Physics 35, no. 1 (2022): 95–103. http://dx.doi.org/10.1063/1674-0068/cjcp2111260.

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Molecular packing patterns are crucial factors determining electron/energy transfer processes that are critical for the optoelectronic properties of organic thin film devices. Herein, the polarization-selective ultraviolet/infrared (UV/IR) mixed frequency ultrafast spectroscopy is applied to investigate the relative molecular orientations in two organic thin films of 7-(diethylamino)coumarin-3-carboxylic acid (DEAC) and perylene. The signal anisotropy changes caused by intermolecular energy/electron transfers are utilized to calculate the cross angles between the electronic transition dipole m
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6

Hsia, Chih-Wei, Kao-Chang Lin, Tzu-Yin Lee та ін. "Esculetin, a Coumarin Derivative, Prevents Thrombosis: Inhibitory Signaling on PLCγ2–PKC–AKT Activation in Human Platelets". International Journal of Molecular Sciences 20, № 11 (2019): 2731. http://dx.doi.org/10.3390/ijms20112731.

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Esculetin, a bioactive 6,7-dihydroxy derivative of coumarin, possesses pharmacological activities against obesity, diabetes, renal failure, and cardiovascular disorders (CVDs). Platelet activation plays a major role in CVDs. Thus, disrupting platelet activation represents an attractive therapeutic target. We examined the effect of esculetin in human platelet activation and experimental mouse models. At 10–80 μM, esculetin inhibited collagen- and arachidonic acid-induced platelet aggregation in washed human platelets. However, it had no effects on other agonists such as thrombin and U46619. Esc
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7

Milanović, Žiko, Dušan Dimić, Milan Žižić, Dejan Milenković, Zoran Marković, and Edina Avdović. "Mechanism of Antiradical Activity of Newly Synthesized 4,7-Dihydroxycoumarin Derivatives-Experimental and Kinetic DFT Study." International Journal of Molecular Sciences 22, no. 24 (2021): 13273. http://dx.doi.org/10.3390/ijms222413273.

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Coumarin derivatives have proven beneficial biological activities, but the mechanism of their radical scavenging potency is not fully understood. In this study, the antiradical capacity of two newly synthesized 4,7-dihydroxycoumarin derivatives: (E)-3-(1-((3-hydroxy-4-methoxyphenyl)amino)-ethylidene)-2,4-dioxochroman-7-yl acetate (A-3OH) and (E)-3-(1-((4-hydroxy-3-methoxyphenyl)amino)ethylidene)-2,4-dioxochroman-7-yl acetate (A-4OH) towards HO• were examined by Electron Paramagnetic Resonance (EPR) Spectroscopy and Density Functional Theory (DFT). The compounds were fully characterized by the
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8

Umi Khasanah, Lia, Baskara Katri Anandhito, Titiek Rachmawaty, Rohula Utami, and Godras Jati Manuhara. "PENGARUH RASIO BAHAN PENYALUT MALTODEKSTRIN, GUM ARAB, DAN SUSU SKIM TERHADAP KARAKTERISTIK FISIK DAN KIMIA MIKROKAPSUL OLEORESIN DAUN KAYU MANIS (Cinnamomum burmannii)." Jurnal Agritech 35, no. 04 (2015): 414. http://dx.doi.org/10.22146/agritech.9325.

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This research was aimed to determine the effect of rasio variation of coating materials which are maltodextrin: arabic gum : skim milk (2 : 0: 4); (2: 2: 2); (0: 4: 2) and (2: 0: 4) on the physical characteristics of two-steps oleoresin microcapsule such as yield, moisture content, solubility in water and the microstructure; and to investigate the chemical characteristics of selected two-steps oleoresin microcapsule which were levels of residual solvent and active compounds. The experimental design used in this research was Completely Randomized Design(CRD) with one factor (rasio variation of
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9

Malacaria, Luana, Rosaria Bruno, Giuseppina Anna Corrente, Donatella Armentano, Emilia Furia, and Amerigo Beneduci. "Experimental insights on the coordination modes of coumarin-3-carboxilic acid towards Cr(III)-, Co(II)-, Ni(II)-, Cu(II)- and Zn(II): A detailed potentiometric and spectroscopic investigation in aqueous media." Journal of Molecular Liquids 346 (January 2022): 118302. http://dx.doi.org/10.1016/j.molliq.2021.118302.

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10

Amanova, N.D Khaitova.J.M Ruzieva.B.Y and Boltaev.B.O. "SYNTHESIS OF COUMARIN DERIVATIVES BASED ON MELDRUM ACID AND ITS ANALOGUES." October 15, 2019. https://doi.org/10.5281/zenodo.3545563.

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The article studied the interaction of malonic acid and acetic anhydride with ketones, aldehydes of the fatty, aromatic and carbocyclic series (yields from 16 to 76%). Based on experimental and physical data, it is proved that Meldrum acid exists in solutions in the form of an equilibrium mixture of rapidly convertible conformers.
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